Hisense TV troubleshooting instance serial - Glacier Xuelang log - Network ...

Beijing appliance repair network. .


Electrical appliances repair brand.


Appliance maintenance projects. .


Audio repair.


Transistor parameters. .


Amplifier repair.


TV repair. .


Download drawings.


Maintenance charges for reference. .


Technical articles.


News. .


Feel free to contact us.


Register Log in columns mode. .


Member.


Label. .


Personal space.


Help. .


Beijing home appliance repair forums? Hisense TV repair repairing malfunctions of Hisense TV? case.


?? Previous topic | Next topic??. .


A new topic.


Published vote. .


Release of goods.


Post reward. .


Publishing activities.


Post debate. .


Publish the video.


Print. .


Hisense TV repair failure case.


Million. .


Maintenance of private.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Personal space. .


Send text messages.


Add as a friend. .


Currently offline.


Medium and small on the top floor 2008-3-11 20:47 it happened. .


Hisense TV repair failure case.


Hisense TV troubleshooting examples of serial. .


The following example is from a network failure and gathered around, also has its own entry, if the author thinks posted incorrectly, you can remind me, I will promptly correcting, because the content is a lot to avoid duplication or omissions, please forgive me readers!.


TF2901 (TB1251) 3 non-illuminated Twitter 2003-5-6 11:21:28. .


TF2901 (TB1251) three light squeaking.


Power found within the ignition tube seat tube, pole and ground speed by checking the ignition terminal signs, seat tube is not damp, re-boot after treatment ignition Department, measuring acceleration voltage up to more than 1300 volts, is still playing inside the tube socket fire. After the welding power to accelerate very open wire, boot without ignition phenomenon, but found resistance R440 (22K) smoke, quickly shut down.This resistance is measured ABL circuit, does not open, suspected line output transformer has the problem, replace the output transformer, grating after power-on, adjust the darker Accelerator knob to retrace lines do not appear, grating still dark, the brightness and contrast or brightness of the image, and unstable, flashing. Measuring the N201 (TB1251) # 28 feet voltage-0. .06V, normal value shall be 6V, diode VD201 negative terminal voltage up to 80 volts, check row output transformers # 8 feet add filter capacitor C423 (0. 056U/100V) open circuit, replace the capacitor C423 after troubleshooting. .


TC2975GF (TDA884X) automatically shutdown 2003-5-6 11: 20: 30.


TC2975GF (TDA884X) automatic shutdown. .


Native to watch an hour, the measurements + B voltage normal, non-24V voltage output, the line circuit stops vibration. The ammeter series join circuit surveillance shut front line current suddenly over 500mA, 600mA at shutdown, it proves that the failure is caused by the increased load line. Automatically shutdown after touching line circuit components, found V957 (pillow school triode) severe fever, and try to replace the same model transistor failure is not excluded. Check with the transistor V957 is connected devices and found no bad parts, but found resistance R955, R956, heat is not following the normal electrolysis C958, C958 test after replacement of electrolytic troubleshooting. Analysis of parabolic wave form pillow school electrolysis C958 leakage, so that line of the output circuit to work properly, causing automatic shutdown protection circuit action. .


TC2977 (TDA937X) three lights 2003-5-6 11: 19: 29.


TC2977 (TDA937X) 3 no lights. .


Post three, lights, measuring the output voltage of the power of the group, the line voltage normal, as well as small-signal processing IC supply voltage is normal. This machine is a single-chip microcontroller core, UOC Super internal integration is very high, because there is a problem, try N201 replacement after the fault persists. Careful analysis of the circuit, to expand the scope of maintenance, all the pins were measured on the N201, N201 # 60 feet when measured (RESET) voltage heard relay rang twice, and then find the blue screen appears full screen flyback lines Judging from video amplifier circuit fault and blue guns, measuring blue gun collector voltage to promote the transistor Q1502 is only 20V or so, check the external circuit, found that resistance R1503 (15K/2W) open, replaced troubleshooting. .


TC2511A (A9) image definition difference 2003-5-6 11: 18: 18.


TC2511A (A9 movement) image resolution difference. .


Generate this fault for the following reasons: (1) ABL circuit failures; (2) ACL circuit fault; (3) brightness channel circuit failure; because the image definition poor, adjust contrast, describes the ABL, ACL circuit normally. Consider another possibility is that the video signal loss of high frequency components result in poor image sharpness. According to this ideas check video channel, discovery video amplifier transistor V184 set electrode with a high-frequency compensation inductance, bit number L183 (22UH), troubleshooting after the replacement. The main role of the high-frequency inductor compensation, open the video signal after the cause of the high frequency loss, while the video images corresponding to the high frequency component is the detail, the sharpness of the image difference. .


TB1238 COB TC2589AD no sound 2003-5-6 11: 17: 06.


TB1238 movement TC2589AD no audio. .


Due to the native image, no sound, using the signal input and output method. First add the video signal input, the TV sound back to normal, the description of the audio amplifier works; and then the TV signal output received another TV signal input, another TV has no sound, the fault occurs in sound demodulation circuit or sound switch circuit. For audio demodulation circuit is done in-house by the N201, so check the N201's # 1 pin, # 53 foot, # 56 feet, found that in addition # 1 pin voltage is 6V high, the other two pin voltage is normal, repair N201 # 1 feet external circuit, found that the collector leakage transistor V102, replacement audio normal. Analysis is due to the CE junction leakage transistor V102, V102 work led to the closing state, so that audio circuit block, there was no audio trouble. .


TB1238 COB TC2566D engine stand no signal after the 2003-5-6 11: 15: 25.


TB1238 movement TC2566D heat exchange station, after no signal. .


Normal TV after approximately 30 minutes, and to change other channel program disappears, but the viewing is not disappear, the automatic search no. Routinely check the tuner band voltage normal, AGC voltage is 4. .06V normal, tuning voltage is 0. changes between normal .5-33V, then detection N701 # 13 feet voltage in the AFC. .5-1.2 .5V, # 36 between foot radio identification signal voltage is 4. .93V are normal, last doubt I2C bus is the problem, measuring N701 # 37 feet voltage 3. 7V, # 38 pin voltage of 4V is also normal, maintenance of temporary financial difficulties. Further analysis, boot normally, half an hour after the failure, should be caused by poor thermal stability components, respectively, N701, N201, N702 heating, when the cotton balls with alcohol after failure to N701, N201 cooling, fault still ; when the memory N702 cooling, the machine returns to normal after replacement of N702 troubleshooting. .


TB1238 movement TC2575G some noise 2003-5-6 11: 14: 09.


TB1238 movement TC2575G part of Taiwan has noise. .


Be the first to use AV input signal, image, sound judgment, AV switch later sound processing circuit. Because the second sound-if signals and video signals from N201 # 47 feet output → buffer → t-V202 high-pass filter ?ú V203 second zoom, and then the audio signal from V203 emitter transistor output, the Z201 (6. .5M) bandpass filter, sent to the N201 (TB1238) # 53 feet, but also because the image properly, according to the judgment of fault signal flow should be # N201 47 feet after the class, # 53 foot fore sound channel circuits. Survey found that the operating point transistor V203 apparent deviation from the normal 4. .3 V, only about 1V, the replacement V203 (2SC1740) is invalid, measured on the bias resistor R246 is 12K, under the bias resistor R247 is 220Ω, and the same color marked rings, look at Atlas on the resistance of R247 labeled as 10K, replacement of the resistor troubleshooting. .


Film without lights DP2988H 2003-5-6 11: 13: 02.


Film DP2988H three no lights. .


Power on led is red to yellow, but the remote is not powered on, the machine has a different "region. Measurement voltage swing of + 75V, power output and other voltages are issued with the machines of different acoustic regularity. Disconnect the plug in the child's # 3 foot XP411, + 75V voltage rises 90V but not swing, because + 75V voltage feedback circuit causing poor poor, with a load capacity of meassuring R521-Terminal voltage to 90V, on the other side of the voltage of 5V, break resistance measuring resistor R521 has become larger to 100K, replaced the machine back to normal. This resistance drawings labeled as 65K, the actual resistance for the 68K, the machine does not boot failure is therefore most resistance caused by deterioration or open, I hope you pay attention at work. .


Film DP2988H no signal 2003-5-6 11: 11: 45.


Film DP2988H no signal. .


Power on, normal image raster automatic search no signal. Measurement of high frequency head, 5V, 9V 32V voltage are OK, try replacing tuner is not valid. Because this machine adopts synthesized tuner, bus voltage to control, measure the SCL clock bus voltage instability, normal, low, suspected bad CPU microprocessors integrated circuit, try replacing N1601 fault persists. When off the bus SCL clock when the external bus voltage regulator diode VD864 back to normal has been measured VD864 breakdown, replacement machine still no signal, try substitution in place the machine thoroughly after U802 cells return to normal. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


Experience.


0 points. .


The user money.


0. .


Read permissions.


50. .


Online time.


15 hours. .


The time of registration.


2008-2-28. .


Last logged in.


2008-10-16. .


View detailed information.


TOP. .


Tens of millions.


Maintenance Pvt. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


The user money.


0. .


Read permissions.


50. .


Personal space.


Send PM. .


Add as buddy.


Currently offline. .


1/f ' ó ?? ?? ° ? ' è?¨??? 2008-3-11 20: 48 ? ????è? ? ???è ? ….


Film DP2988H level light line. .


This machine field output circuit together with N661 N761, positive and negative power supply N761 used to measure the # 4 N761 feet voltage is 14V, # 6-feet voltage 17V are OK, the perimeter is no short circuit. Because the field sawtooth wave amplifier and blanking pulse generation circuit is completed by N761 try substitution N761 is invalid. Measuring 7 feet N661 # 17V normal voltage, # 2 foot yard feedback voltage low, disconnect the resistance measured properly, try R680 substitution N661 fault still. Maintenance in trouble, according to circuit sawtooth pulse is not sent to the suspected site field deflection coil, measuring the BE junction voltage transistor V761 and found that there is no on-transistor V761, R770 resistance measurement has been broken open, replaced the machine back to normal. .


TC2939N (H97B) brightness instability.


General maintenance of the brightness range of fault by dark brightness control and ABL circuit, this movement by bus control of various simulation Liang Jun, because other functions normally, so do not consider the brightness control. ABL circuit measuring voltage capacitor C445 between 14-19V swing, while the image brightness by dark, try substitution capacitors C445, C240 invalid. Check resistors R246, R245, R440 were normal, measuring acceleration voltage, TA8880 # 25 feet (ACL), # 53 feet (ABL) have the same voltage, indicating the circuit itself is not caused by ABL.Measurement of filament voltage normal, taking into account only by depending on the measuring circuit caused by the three primary colors the output voltage is not changed, check the electrolytic C901 voltage variation between 60-180V, come discover the inductance measurement has a larger L590 resistance, because of its internal performance due to poor depending on voltage suddenly subsides, image brightness, troubleshooting after the replacement.


TC2980 (H97C movement) part of the station is not synchronized with white bar interference. .


A native part of the table is not synchronized with white cross-channel interference, check the synchronization separation circuit, signal path is no exception. Carefully observed this phenomenon similar to previous Hisense TC2939N machines horizontal road noise, poor synchronization fails, the original change programmes is to place the unit in NI01 # 17 feet (CVAGC) external capacitor CI06 220N by 50V/300V/27N instead, in accordance with the programme's ideas, try the N201 # 48 feet (AGC) instead of the external capacitor C222 50V/270N, troubleshooting.


DP2999 (film) 3 no. .


There is no power on, power on the sound. Observation on board discovery 12V supply voltage of the current limiting resistor burned black multimeter measurement has open circuit, rectifier diode VD906 breakdown, to replace a grating after power-on, full Green retrace lines, while the current limiting resistor began to smoke. Check 12V load power supply circuit, found a way for the 12V supply voltage video amplifier board, measured as the release of three integrated 12V power supply pin to ground resistance and found the green video amplifier IC ground pin 12V power supply resistance is much smaller than the red and blue video amplifier circuit, replace the green video amplifier IC N521 (TDA6111Q) after troubleshooting. .


TC2588H (LA76818 COB) remote control standby hum.


Remote shutdown just B4 (24V) power supply lines cut off, other power supply from various quarters, especially B2 (24V) audio power still exists, when there are interfering signals into the audio circuits source string hum when the phenomenon occurs.The workaround is to B2 (24V) power to join all the way to remote control switch control circuit, as shown in the picture: the original machine of resistance R562 (1 Ω), increasing a PNP medium power transistor series on the circuit board V580 B892, transistor V580 BE increased of a resistance between the junction R ' (10K); triode V580 b and C of the triode V552 between adding a resistor R "(1. .5K), leaving a space of resistance, as shown in the figure below. Changes in accordance with this method, the TV will turn a "cracking" of a sound, the sound is not normal. (Tentative trial this method, if you have a better way, you are welcome contributions, we will continue to discuss!). .


TC2975F (A6/A9) in the middle of the screen without raster line called 03042003-4-17 11: 45: 22.


Failure instance TC2975F (A6/A9) no grating line center of the screen called. .


(1) grating basically normal description line scan circuit basic functioning; (2) a description of the phenomenon of row frequency sounds and pulse circuit, such as line pulse and deformation resulting frequency offset, phase is not correct. According to the above analysis, measure the N201 # 26 feet voltage of 2 .5V, higher than normal. ", line by line backward pulse output transformers # 5 feet, respectively, the three-way to the N201 (LA7687A) # 26 feet, N271 (LC89950) # 13 foot, N801 # 26 feet. Check each of three circuits, found that disconnecting N271 # 13 feet when the fault disappears, this time measuring N271 # 13 pin voltage is 7. .5 V, significantly higher than normal voltage, replacement of N271 after troubleshooting. Analysis because LC89950 # 13 feet to the power supply terminal breakdown, the superimposition of a line pulse DC voltage, resulting in the incorrect phase. .


TC2139 (A6/A9) automatically shutdown 03042003-4-17 11: 43: 57.


Failure instance TC2139 (A6/A9) automatic shutdown. .


First of all suspected protection circuit, N801 # 41 feet measured voltage of 2V, confirm that the protection circuit is action. Disconnect the cross-wiring W654, N801 # 41 feet voltage to 5V. Drain the protection diode, when disconnected from power supply protection diode VD643 field, the level of power on the screen, rendering the lit line off check field output IC PIN to ground the N501 resistance, found # 12 foot-to-ground shorts. N501 # 12 feet checked the external circuit, found that the capacitance C520 breakdown, troubleshooting after the replacement.


TCP5001 (projection) level bright line 03042003-4-17 11:42:49. .


Fault instance TCP5001 (rear projection) level off line.


This machine field circuit is more simple, use Sanyo LA7838 IC measurement field supply voltage normal, test for I601 machine back to normal, but there a few minutes later the level of aging bright line failure, even the burning field block. Block of changing market again after the power supply voltage fluctuations obvious suspect bad power supply filtering, test for electrolysis C622, the machine never to burn field block.Here are two points to note: 1, in the maintenance of rear-projection machine level off the line, it should first be three projection tube to defocus State, then adjust the brightness, or else the projection tube; 2, in the maintenance level light fault line, be sure to set the field circuit filtering electrolytic C622 LA7838, along with the replacement.


TCP5001 (projection) of individual mode without audio. .


This machine has a total of five music mode, when you switch to the concert hall, stereo mode, sports mode are not accompanied by sound, Dolby sound normal condition, because of the audio processing in a unit test for surround sound unit failure. Measurement bus voltage normal, the analysis of this machine voice mode with two amplifier block is completed, the concert hall, sound of stereo, the stadium is accomplished by I401, oscilloscope L, R-channel sound is not sent to the discussion changing C425 I401, C426 machine back to normal.


TC2588D (A12) treadmill. .


According to the user when they reflect normal viewing images properly, only change when the image is not clear from the slowly turning into a clear image, also the second day, a cold boot, there will be no more than one image. Post examination found high frequency program treadmill more serious, the measurement of high frequency voltage pin head, try replacing the normal tuner is not valid. Adjust, replace 38MHz frequency in the week (ST6019) does not work, check the N101 (LA76810) # the normal 50 feet peripherals. Careful consideration, the decision to focus on checking the circuit voltage VT, try replacing the formation of ceramic capacitor C706 (220P) troubleshooting.


TC2175GD (A12) 3 no lights. .


Press to open the main power led is on, but not remote boot, measurement + 10V voltage in B around jitter, N801 # 7 foot standby control foot no voltage, disconnect the # 7 feet + B = 115V, image, sound, remote control will return to normal, just can't control shutting down, failure to appear in the remote control circuit. When remote control is not powered on, and found out that this machine has a "Squeaky" calls, and transistor V643 emitter output + 5V voltage instability, the voltage varies slightly groan. Check +5 V form a circuit and found no abnormal components, using substitution method one by one substitution of major components, electrolytic capacitors C645 contemporary for when troubleshooting. Remove the 16V/2200UF measurement not found tainted fluid or electrolyte leakage phenomenon, analysis of possible poor performance of the electrolytic capacitor, resulting in increased ripple +5 V, so that CPU can not start properly and caused the failure. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


Experience.


0 points. .


The user money.


0. .


Read permissions.


50. .


Online time.


15 hours. .


The time of registration.


2008-2-28. .


Last logged in.


2008-10-16. .


View detailed information.


TOP. .


Singular landscape stereo sound maintenance repair malanshi sound maintenance repair Sony nec stereo audio power amplifier repair maintenance Tianlong Yamaha audio amplifier repair maintenance for nobility.


Million. .


Maintenance of private.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Personal space. .


Send text messages.


Add as a friend. .


Currently offline.


2nd Floor, medium and small on 2008-3-11 20:48 it happened. .


TC2175G (A12) upper level bright image.


The upper level of the image appears bright for the field should be linear with poor or low market power, failure to measure the N501 (LA7840) # 6 foot market supply voltage +24 V (normal), the other the pin voltage is also normal. Analysis that boot more than 20 minutes after the failure of components thermal stability is poor, with a hair dryer on the circuit board heating, when heated to N652 (L7812) three-terminal regulator integrated circuit fault occurs, then the output voltage measurement N652 +13. .2 V, to the upper heating N652 superimposed when the image brightness with brightness enhancement, then the output voltage is +13 test N652. .7 V.Use absolute alcohol tampon for N652 cooling, when the voltage drops to 12 N652. .7V disappear, when light belt replacement N652 after troubleshooting. Analysis of the level of bright output voltage is too high N652, N652 output + 12V voltage through the voltage divider R501, R500, as the # 4 foot N501 (NON-INV-IN) provided by reversed-phase input offset voltage when the + 12V rise, the bias voltage of the output waveform N501 distortion occurs above faults arising.


TF2908U (TB1251) 3 no. .


On a bright power LEDs, and within a minute dark issued a squeaky noise measuring power + B voltage from post instantaneous 130v forthwith to 30V, then rose to 130V then drop ..., measuring a few other changes in voltage, CPU power in 5V ~ 2V description power between the changes that are not working properly. In order to determine the power problem or load short-circuit power caused by abnormal, disconnect the line circuit then leave the road load output voltage are OK and conclude that the fault in the line circuits. Measuring Output Tube and around the components normal recovery line circuit test line output transformer T401 substitution after troubleshooting. Analysis due to line output transformer secondary winding short circuit, causing power overload, so that outputs can be voltage drop, TB1251 line supply voltage is too low due to stop vibration caused by line, line output transformer does not work, because of the load lighter after the power supply , voltage recovery, line output circuit then back to work, so the cycle continues, there began the fault phenomena described. (Please contact us on). .


TC3401 (TB1251) level off line.


After booting the level of bright lines, measuring the output IC N401 field the # 6 foot, # 3-pin, # 2 pin voltage are 27V, the initial judge was not due to field excitation signal. Measurement N201 (TB1251) # 24 feet (field sawtooth wave form) voltage of 4V, # 25 feet (field feedback) voltage of 5V, # 26 feet (field pulse output) voltage to 0. .9 V, normal. N201 # 14 pin (RGB power supply) voltage of only 7V, the normal value should be 9V. 9V voltage is rectified by the VD554, C564 filter formed 14. .5V, V554-centric regulator of + 12V voltage after voltage regulator IC N205. Transistor's base electrode V554 reference voltage control by the standby control signal to measure b voltage V554 is 7. .8V (low), V555 b voltage is 0. has charged .6V checks the standby control triode V709 c voltage 0 .9V, b., voltage 0V, Typ V709 b voltage should be 0. 7V, C voltage should be 0V, remove V709 measurement, found that BE junction breakdown, replacement troubleshooting. .


TC3489D (TB1251) will not be scheduled no lights.


Boot shock circuit board, the fault appears. At this point measurement N205 (AN7809) 9V output voltage 0V, the integrated block serious fever. N205 power output measured ground resistance is 0Ω, further inspection revealed unplug the A5 board (AV switch board) after the fault no longer occurs. Carefully observed within the C804 A5 pin board shield at one end and steel collide, poke with a flat screwdriver, the machine back to normal. Note: This device by shielding too close, are more prone to these issues. .


TC3489D (TB1251) low brightness.


Observed image color cast boot and low brightness, adjust the gate voltage to normal, the image appears flyback lines. N201 # 42 feet measured normal power supply, # 39 pin brightness normal input voltage, test invalid for N201. As TC3489D machine bright colors were separated in the post-terminal board, terminal board fault remains after switching.RGB output terminal voltage measurement, filament voltage, depending on the voltage normal, depending on the transistor V901, V903, the collecting electrode voltage V905 are relatively high, at around 175V, considering the three shots at the same time the possibility of damage to the circuit are smaller, so the circuit from the start, with highlights of 9V power supply voltage measured properly, try replacing transistors V907, V910 after the machine back to normal. Measurement of the substitution of transistors are not unusual, suspected adverse performance because of the triode, causing a energy highlights circuit is not fully close and appears this fault.


TF2988 (TB1238) no signal. .


First automatic, found no snow on the screen, if there is a problem, check the channel tuner U101, N201 (TB1238N) if the relevant circuit, U101 and N201 between circuit did not find a component is damaged. Taking into account also the cause of such abnormal bus voltage failure, measurement of N701 of the # 37 foot, # 38 pin voltage and found # 37 pin voltage is about 1V (low), # 38 feet from side to side voltage of 4V, check # 37 feet tiles found in the external circuit capacitance C716 leakage, replacement of the same model 100P porcelain capacitor voltage back to normal, then auto search, image, audio sound, troubleshooting. .


TC2920 (TB1238) automatically shutdown 03042003-4-17 11: 24: 02.


Failure instance TC2920 (TB1238) automatic shutdown. .


Native remote or keying is prone to automatically shutdown, remote control or field amplitude fluctuates, changing the background image. According to the symptom analysis that belong to the memory or CPU work. In line with the principles of maintenance easier, first on memory and peripheral components, is not found, try replacing memory fault persists. Then on each pin of the CPU for comprehensive measurement of voltage, found many PIN voltage deviation from the normal value, the CPU peripheral devices for measurement of resistance, the road is not unusual, try replacing 8M crystal oscillator and CPU, the fault persists. Thus maintenance of trouble, the voltage measured with the icons for further careful voltage control, found that N701 # 37 pin (serial clock) and the icon voltage difference more than the normal 3. .8 V, # 37 feet off the external measurement of each component, found similar resistance resistor R743 open, replaced troubleshooting. .


TC2900 (TB1238) cold boot level off line.


TC2900 (TB1238) cold boot the level of bright lines. .


Because of the particularity of the fault, so maintenance must be fast, accurate to avoid misinterpretation. After measuring the field output IC N401 (TA8427K) # 6 foot power supply properly, # 27V 3 foot yard pump power supply voltage is normal. Measure # 2 foot yard sawtooth wave output voltage 16V (high), R * 1 multimeter tried blocking trigger # 4 feet field foot pulse input line to expand the level of brightness, the description field in the output circuit around. Measurement including the N401 # 4 feet, other pins, find # 4 feet voltage low, analysis is insufficient field excitation signal. Check N401 external circuit, found resistance R259 (1K) resistance become larger, replacement troubleshooting. .


TC2566D (TB1238) no picture has a sound.


According to preliminary determine fault behavior problems should be in the power circuit and line scan circuit. See no obvious damage to the circuit components phenomenon, turn the main power source for the measurement of B1 0V, off-line access to dummy loads the boot circuit B1 is still the same, adjust RP551, B1 can reduce but not increase, voltage measurement V553 e-5 . .2 V (normal 6..2V), C-pole voltage 7V (normal to 40V), it is clear that the sampling and error amplifier circuits are not working properly, and then check the voltage circuit sections, find the b, V511 e-10V about V511 c and the extremely V513 are high voltage power instantly would slowly decrease thereafter, suspected regulator are not working properly, try changing this part of the component is not regulated. Re-adjust their thinking, measuring audio power supply B2 (+13 V), small signal processing circuitry B5 (+15 V), field output circuitry B4 (+27 V) are normal, indicating the point of failure should be rectified in the B1 filter circuit, test for electrolysis C561 (160V/220UF), B1 back to normal, measure replaced the electrolytic C561 is no longer capacity, connected to the line of the load machine back to normal. .


TC2110G (TB1238) level off line.


The pin voltage is measured normal N401, N401 with the interference method, tap the # 4 foot level to begin light line shows the output circuit around the normal field, fault before the presence of sawtooth wave pulse input stage circuit, checking the external feet N401 # 4 circuit resistance R259, capacitors C403 normal, suspected sleeper school IC N402 (TA8859) poor substitution test is invalid. Measurement N201 (TB1238) associated with the fault pin, found that N201 # 23 pin voltage is nearly 0V, normal voltage should be 4. .5V, check the external circuit components, found ceramic capacitor C217 (1500P) breakdown, troubleshooting after the replacement.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Experience. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Online time. .


15 hours.


Registration time. .


2008-2-28.


Last Login. .


2008-10-16.


See more details. .


TOP 。.


TV repair stereo audio landscape maintenance Beijing TV repair service. .


Tens of millions.


Maintenance Pvt. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


The user money.


0. .


Read permissions.


50. .


Personal space.


Send PM. .


Add as buddy.


Currently offline. .


3/f, l m s ° ? ' è?¨??? 2008-3-11 20: 49 ? ????è? ? ???è ? ….


Hisense brand TC2939N failure example brightness instability. .


Brightness range of fault in general maintenance time is brightness control and ABL circuit, this movement has adopted various analog bus control, other functional, so there is no need to consider the brightness control. Measurement voltage circuit capacitance C445 ABL in swing between 14-19V, image brightness all try replacing capacitor C445, C240 is invalid. Check resistance R246, R245, R440 are OK, measuring acceleration voltage, # 25 foot TA8880 (ACL), # 53-foot (ABL) voltage are unchanged, the description is not caused by ABL circuit itself. Measuring filament voltage normal, taking into account only caused by the video amplifier circuit, measuring the output voltage of the three primary colors are the same, check the electrolytic C901 voltage varied between 60-180V, Shun measured and found to have greater resistance inductor L590, because poor performance led to an internal video amplifier voltage fluctuated, causing the image brightness instability replacement troubleshooting. .


Fault instance haixin TC2980 part table is not synchronized.


The machine part of the station are not synchronized, there is a white bar interference, check sync separation circuit, the signal channel without exceptions. Closer examination reveals that this phenomenon is similar to previous Hisense TC2939N bar machine interference, poor synchronization failure, the original program is in place to change unit NI01 # 17 feet (CVAGC) external capacitor CI06 by the 50V/220N to 300V/27N, in accordance with the program ideas, try the N201 # 48 feet (AGC) external capacitor C222 to 50V/270N, troubleshooting. .


Fault instance haixin DP2999 three.


Power 3 No, there is the sound power. Observed circuit board found that the supply voltage of 12V current limiting resistor burned black, with a multimeter measure has been open, rectifier diode VD906 breakdown, to replace the boot after the grating appears, full screen green flyback lines at the same time limiting resistor began smoking.Check the load circuit 12V power supply, 12V power supply voltage is available for all the way, depending on the plate measuring three depending on the power supply pin 12V circuit to ground resistance, find green depending on the place of supply of integrated circuit 12V feet to ground resistance number distant less than red and blue depending on the IC, IC green depending on replacement N521 (TDA6111Q) troubleshooting.


Hisense brand TC2588H remote fault instance standby hum. .


Remote control shutting down after only B4 (24V) line power cut, the other ways power supply, especially B224V) sound power supply still exist when there is interference signal source string into the audio circuit a hum. The solution will be B2 (24V) power remote switch control circuit to join the way, as shown: the original machine the resistance R562 (1Ω) removed, to increase a series of medium power PNP transistor B892 placed the location of the circuit board V580 , the transistor V580 is added between the BE junction resistance R '(10K); transistor V580 V552 B-C-polar and polar transistor is added between resistor R "(1. .5 K), resistance of the circuit board vacancy left , according to the figure can be connected.In accordance with this method, the TV set on a "when" sound, the sound is big is normal.


Hisense brand TC2975F no grating line center of the screen is called. .


(1) grating basically normal description line scan circuit basic functioning; (2) a description of the phenomenon of row frequency sounds and pulse circuit, such as line pulse and deformation resulting frequency offset, phase is not correct. According to the above analysis, measure the N201 # 26 feet voltage of 2 .5V, higher than normal. ", line by line backward pulse output transformers # 5 feet provides, fractal, the three-way N20LA7687A) # 26 feet, N271 (LC89950) # 13 foot, N801 # 26 feet. Check each of three circuits, found that disconnecting N271 # 13 feet when the fault disappears, this time measuring N271 # 13 pin voltage is 7. .5 V, significantly higher than normal voltage, replacement of N271 after troubleshooting. Analysis because LC89950 # 13 feet to the power supply terminal breakdown, the superimposition of a line pulse DC voltage, resulting in the incorrect phase. .


Fault instance haixin TC2110G level off line.


The pin voltage is measured normal N401, N401 with the interference method, tap the # 4 foot level to begin light line shows the output circuit around the normal field, fault before the presence of sawtooth wave pulse input stage circuit, checking the external feet N401 # 4 circuit resistance R259, capacitors C403 normal, suspected sleeper school integrated circuit N4 (TA8859) poor substitution test is invalid. Measurement N201 (TB1238) associated with the fault pin, found that N201 # 23 pin voltage is nearly 0V, normal voltage should be 4. .5V, check the external circuit components, found ceramic capacitor C217 (1500P) breakdown, troubleshooting after the replacement.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Experience. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Online time. .


15 hours.


Registration time. .


2008-2-28.


Last Login. .


2008-10-16.


See more details. .


TOP 。.


Landscape maintenance strange sound sound sound sound maintenance Marantz repair nec Denon audio amplifier repair maintenance repair Sony Sound Yamaha audio amplifier repair maintenance Tin Yat. .


Tens of millions.


Maintenance Pvt. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


The user money.


0. .


Read permissions.


50. .


Personal space.


Send PM. .


Add as buddy.


Currently offline. .


4/f, l m s ° ? ' è?¨??? 2008-3-11 20: 50 ? ????è? ? ???è ? ….


TC2961D (A6) automated platform. .


Overhaul procedures: post revealed that the machine is automatically scrambled channels, volume, AV, etc also bounce, remote control and key features are malfunctioning. Based on past experience, are suspected to be caused by a leakage switch, all key switch replacement, but still failed. Because this machine adopts a comparative pushbutton input voltage, so detection N801 # 14 feet, # 15 feet voltage. When the measurement of the two pin voltage, the fault disappears, disconnect the plug sub-XP1003 along lines of # 16 and # 17 feet feet, failure also disappears, to infer the point of failure in the former control panel, control panel before the measurement the resistance of R1912, R1913, R1912 resistance has been found open, replace the resistor R1912 after troubleshooting. .


TC2187A (OM8361) field is not synchronized.


Maintenance process: measurement N303 (OM8361) of the # 42 foot (field sawtooth wave form) voltage of 2. .9 V, # 43 feet (field sawtooth wave pulse output) voltage to 0. .9 V normal. Analysis that the market may not synchronous with the field oscillation circuit, the synchronous separation circuit, measure the pin voltage N303 and found that except # 16 pin voltage is 0. .7 V (normal should be 0..23V) high, normal foot, the foot of the # 16 N303 to convert TV/AV, wouldn't the foot and the leg voltage? check the foot Circuit found that the capacitance C826, new welding voltage No. 16 feet after the restore is 0. .23V, troubleshooting. Note: when the # N303 16 .5V voltage exceeding 0. starting out field does not synchronize phenomenon, peer attention.


TC2975AF (TDA884X) the level of bright lines. .


Overhaul procedures: this failure after preliminary examination, the resistance R807, farm output R806 open circuit IC N801 (TDA8351) is damaged, replace these components after boot, instant R806 R807 smoke, after asking the user that the machine once upon a time there were two horizontal light fault line, each time the main power switch to on. Off-line load circuit, then a fake load, start an instant measurement + B output voltage up to 160V, then returned to normal, if you use remote control switch machine, the + B output voltage is maintained at 130V; heat after the switch machine, + B voltage is also normal ; only cold boot, instant + B voltage will suddenly rise. Check the voltage regulator circuit resistor R526 resistance found in larger, after the replacement resistor R526, + B voltage is maintained at a normal 130V, troubleshooting.Analysis of this failure is due to a rise of + B voltage transient, causing rows to the output circuits of the field output voltage rise, eliciting resistance R806, R807 and farm output IC N801 damage.


TC2910UF (TDA937X) 3 non-, light flash. .


Overhaul procedures: measuring primary voltage 20V 130V only, disconnect the main power supply and output transformer T401 # 2 foot cross-wiring, 60W light bulb as false measurement load, as the main power supply voltage, line drive transformer 129V T402 0 .6V secondary. around the AC voltage, power part of the work, the fault in the range of rows row after driving circuit output circuit. Welding under the false load, measuring Output Tube V405 collector-to-ground resistance is 50Ω (too small), were broken inductor L403, L480 and line output transformer T401 # 1 foot all remain the same, indicating the point of failure is not in line output control and pillow school circuit. One by one off-line output transformer load from various quarters, when the T401 # 9 feet off the external circuit, the start instant measurement 130V output voltage normal, focusing on inspection as the discharge power supply circuits.When you disconnect the power resistor R913, instantaneous measurement depending on 180V voltage returns to normal, depending on the IC N901 (TDA6107JF) damage, remove the # N901 measuring 4 feet, # 6 feet between short, replace N901 after troubleshooting.


TC2999A (TB1238) repeated loss of field block. .


Overhaul procedures: post examination found N401 (TA8427K) is exploding, remove the N401 power supply voltage measurement field 27V properly, and very stable. Because the aircraft had to be repaired several times, but every time I change after ten days of normal use. A comprehensive inspection field output circuit resistance, resistance R401 from 10 Ω to 100 Ω, and replace resistance R401 and farm output IC N401, power on the grating is normal. Work for a period of time and damage to the N401 illustrates resistance R401 variable value is not the root cause of the damage N401. Analysis of drawings, suspected faulty pump power supply circuit, check the diode VD401, electrolysis C405 found no damage, test substitution electrolysis C405, aging period of time troubleshooting. Analyze the reasons for this failure is the failure of electrolytic C405, leading to market the output boost circuits IC TA8427K bootstrap disorders, resulting in transient surge current breakdown N401. .


TC2910G (TB1238) line interference.


Maintenance process: this machine to watch normal TV programs, and only then VCD karaoke OK, the images have interference lines, suspected a problem with AV input signal, resulting in audio interference image. Because the native audio and video input by direct coupling, without isolation capacitor, the first test substitution AV / TV switch integrated circuit NA01 (BU4053BC), failure still. Examination revealed from the side of the AV audio input signal will not interfere with the image, so the scope of focus in the post-fault AV board.Careful analysis of the view that, since side AV AV plate after plate and between the lines long, and the Earth wire is also connected via cable, the suspect may be the Earth grounding plate after the AV, and VCD input bad sound signal amplitude, ground resistance formation affect small voltage video signals cause interference. AV Board after the measurement of ground and tuner earthing resistors, found 0.2 Ω or resistance, its beginnings and ends with heavy cross-wiring connection, commissioning, troubleshooting.


TF3488D (TB1251) boot protection. .


Overhaul procedures: power led is lit, hear the pick-up after led is off, measuring N701 (TMP88CP38AN-3E98) # 42 feet 5V power supply, + B, voltage 0V to reboot after the shutdown, repeat the above phenomenon. # 42 feet by N701 5V supply voltage, without a doubt the power circuit problems more likely, but check N501 (STR-F6656) and the external circuit is not unusual, load circuit or short circuit. Applications under the STR-F6656 Circuit (2002 introduced the first 10 monthly service), problems of over-voltage protection circuit, most likely, so check the voltage regulator control circuit emphasis, when the measurement sampling resistor R557 (1/4W-47K) and found that resistance has become infinite, replacement troubleshooting. Because the sampling resistor open circuit, resulting in higher output voltage caused + B overvoltage protection. .


TF2908S (TB1251) cold boot noise 2003-7-17 14: 28: 37.


Maintenance process: cold start noise when the audio in, turned on, the noise gradually decreases, noise disappears after 10 minutes, audio back to normal. As the models more complex audio processing circuit, so to judge the scope of the damage is the key to failure. First to use AV input method, the same phenomenon, but the normal AV audio output, thus determine fault lies in the AV conversion circuit later, audio processing and audio amplifier block block TA1216 TA8256H. According to fault phenomenon, initially judged as poor thermal stability of components, such as electrolysis poor filtering performance.Looking for a 10UF electrolytic on related circuit filtering electrolytic the trial and did not identify the fault element. After careful listening to the sound, I found the right channel noise is larger than the left channel, then use the methods of maintenance of signalized intersections. Will NA01 left and right channels of signals input # 2, # 4 external CA12, CA14 cross-connections, the result remains after fault in that PA output circuit. Then from the two-channel amplifier output coupling electrolytic CA20, CA21 cross, turned on, the left channel noise is larger than the right channel, thus excluding the possibility of bad speakers, component failure or right should be NA01 channel output device, check CA20, CA23 were normal, confirmed that none other than the fault component of non-NA01. Remove the NA01, to observe the model for the CD8256, replacing a TA8256, the boot troubleshooting.CD8256 for components, the recent failure rate is high, and TB1238 cob, often manifested by abnormal sound, the sound to change small failures, we recommend that you repair replacement TA8256.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Experience. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Online time. .


15 hours.


Registration time. .


2008-2-28.


Last Login. .


2008-10-16.


See more details. .


TOP 。.


Old autumn. .


Maintenance of Lieutenant.


Post. .


208.


Essence. .


0.


Points. .


187 min.


Prestige. .


2 points.


Users currency. .


$ 0.


Read permissions. .


50.


Personal space. .


Send text messages.


Add as a friend. .


Currently offline.


5th Floor, medium and small on 2008-3-11 22:02 it happened. .


Good really good, accept!!.

















Post. .


208.


Essence. .


0.


Points. .


187 min.


Prestige. .


2 points.


Experience. .


2 points.


Users currency. .


$ 0.


Read permissions. .


50.


Sex. .


Male.


From. .


Hebei qianan.


Online time. .


96 hours.


Registration time. .


2008-2-16.


Last Login. .


2008-12-13.


See more details. .


TOP 。.


Landscape maintenance strange sound sound sound sound maintenance Marantz repair nec Denon audio amplifier repair maintenance repair Sony Sound Yamaha audio amplifier repair maintenance Tin Yat. .


Lovers of electrical appliances.


Maintenance Pvt. .


Post.


30. .


Essence.


0. .


Integral.


24 points. .


Prestige.


2 points. .


The user money.


0. .


Read permissions.


10. .


Personal space.


Send PM. .


Add as buddy.


Currently offline. .


6/f, l m s ° ? ' è?¨??? 2008-3-12 16: 07 ? ????è? ? ???è ? ….


Thank you, I accept good things is really left after the back-up. .


Post.


30. .


Essence.


0. .


Integral.


24 points. .


Prestige.


2 points. .


Experience.


2 points. .


The user money.


0. .


Read permissions.


10. .


Online time.


18 hours. .


The time of registration.


2008-3-3. .


Last logged in.


2008-6-13. .


View detailed information.


TOP. .


TV repair audio repair Beijing television repair maintenance landscape audio.


Million. .


Maintenance of private.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Personal space. .


Send text messages.


Add as a friend. .


Currently offline.


7 F medium and small on 2008-3-14 14:13 it happened. .


DP2999 (film), three no. lighted.


Maintenance Process: turn lights from red to dark immediately found protection, measuring supply circuit output voltage of each group, + B voltage, +12. .7 V voltage outputs are 0V, the Way examination revealed open RF802 limiting resistor, rectifier diode VD806 short circuit, replace the components, the boot back to normal voltage measurements + B, +12. .7 V voltage output remains at 0V. Earth resistance measurement diode VD806 still short, double-check that when the disconnect plug sub-XP531 resistance returned to normal when measured to determine fault appears in the video amplifier circuit. +12. .Plug the 7V voltage through # 5 foot sub XP531 respectively to the three depending on IC N511, N521, N531 's # 2 feet for power, disconnect from N511, N521, N531 + 12V power supply for the feet, the discovery of electricity N521 N511, foot-to-ground shorts, disconnect the two components of the # 2 foot plug in power supply, connect, power up the child XP531 blue grating, replace N511, N521 after troubleshooting.


DP2999 (film) 3 no. .


Maintenance of process: the power led is not lit, check fuse F801 is not damaged, 300V rectification filter properly. Measurement + B output voltage to 0V, this power supply circuit three-channel voltage output, the measurement of the output of the rectifier diode resistance are OK, judging malfunction does not work for the power circuit. Measuring thick film IC N801 (KA3S0680R) feet voltage, short circuit N801 # 4 foot, the foot control for voltage feedback feet, broken N801 # 4 pin peripheral circuit resistance back to normal. Check external voltage regulator diode DZ801, DZ802, DZ804 and optocoupler N802, found DZ802, N802 short circuit, replace the DZ802, N802 after troubleshooting. .


DP2999 (film), no..


Maintenance process: power measurement + B output voltage 0V, 300V power rectifier output voltage is normal, check the thick film integrated circuit N801 (KA3S0680R) the pin voltage is found N801 # 4 pin voltage of 0V is not normal, key-point # 4 feet external circuit elements, found Zener diode DZ801 (MTZ8. .2 C) has been penetrated, the replacement + B was measured at 50V output voltage and unstable about suspected N801 internal circuit is damaged.On the substitution and measurement + N801 B output voltages as high as $ 170V, Shutdown check voltage feedback loop of related components found optocoupler N802 (PC817B) # 3 feet and 4 feet between 15 k resistance, replace the optocoupler N802 after troubleshooting.


DP2999 (Film) Three no, lights. .


Overhaul procedures: measuring the output pipe V403 has breakdown, to replace the line of output circuit after check in and around each point resistance basically normal, power-on test machine image and sound are OK, the output voltage measurement + B. This ageing after 10 minutes, a picture of the phenomenon of shrinkage and automatically shutdown. According to the symptoms of lack of motivation for rows, detect line drive circuit and around each point resistance. When the measured resistance R412 found R412 resistance instability, fluctuates, carefully observed resistance R412 end, welding and aging 2 hours after everything properly.


TDF2988G (film) without a sound plan. .


Overhaul procedures: users reflect the start-up with free images, TV warm-up 5-10 minutes for the image to return to normal, but also to change image moments. On the road to measure power output voltage properly, looked from the symptom, the fault should be in the line circuits, measuring line voltage, circuit points found only accelerating voltage 200V, 100V voltage lower than normal, check the normal accelerator external circuit, taking into account the range of possible faults in the arc light circuit. Preheat the machine images for normal, thus suspected to be caused by bad performance components, the circuit components of the highlights of each heat consumption, it was discovered when the image when heated to normal diode VD101, VD101 diode shows poor thermal stability, resulting in consumers bright spot circuit malfunction, replace VD101 after troubleshooting. .


TC2588L (A12) and curling.


Maintenance process: the lower part of the boot after the grating curling, the pin voltage measurement N501, in addition to # 5 pin voltage is low to 1. .8 V outside (normal should be 2. .28 V), the remaining pin voltage is normal. Suspected N501's # 5 feet external circuit anomaly, check the external capacitor C501, electrolysis C504, resistors R505, R507 were normal. Expand the inspection scope, N201 (LA76810) in the field sawtooth formation circuit inspection, measurement N201 of the # 23 pin voltage is 2V (normal should be 2. .28 V), # 24 pin voltage is 2. .1 V (normal should be 2..7V), # 25 pin 5V supply voltage normal, check the N201 # 24 foot peripheral circuit capacitance C232, Discovery (0. .47UF/100V) has 47 K Ω resistance, capacitance, C232 leakage description after the replacement. Analysis is of the view that the effect of the leakage capacitance C232 N201 field sawtooth formation of charging and discharging time, undermining the N201 # 24 foot internal working state, thereby causing edge failure under volume Bragg gratings.


TC2199D (A12) from time to time automatically shutdown. .


Overhaul procedures: this machine belongs to Sanyo A12 COB series, a line of simple, feature huge. Because it does not appear regularly, so it is automatically shut down suspected movement with soldered at present, the machine has been carefully removed cover has not discovered soldered on, judgment should be line fault. Then power on Aging, about two hours after the failure, in which case the measurement IC801 (LC863324A-5N09) feet voltage, found # 31 feet (SAFTY) is a low level, this detection function to protect feet and legs, so judgment is that the protection circuit auto shutdown failure caused by the action. B, measurement transistor V449 is extremely high, so V449 conduction, C showed very low, the low sent the # 31 pin IC801, IC801 pin # 31 is detected low, the judge may be due to causes some abnormal filament circuit, output shutdown command to enter the standby power supply circuit to avoid the failure to expand. Check the protection circuit on the key components, measuring the voltage across the electrolytic C445 normal, check around the resistor R446, R447's resistance and found the resistance of resistor R447 has four. .3K increases to replace R447 200K, resumes normal after observation.


TC2199D (A12) 3 non, lights. .


Overhaul procedures: to first detect the remote control and receiver are not unusual, measuring IC801 (LC863324A-5N09) # 7 foot, remote control switch is a voltage change, but less than normal value 5V. Forced on all normal, CPU or Crystal X801 (32KHz) there is a problem, try replacing faulty behavior. Check the reset voltage normal, CPU supply voltage of 5V, with jitter measurement of power of the output voltage is obviously jitter, the problem lies in the power circuit. Carefully check the power supply circuit points, found that the emitter voltage of transistor V631 is low, the normal value of 6 normal. .2 V, the characteristics of suspected adverse regulator diode VD641, VD641 replacement after troubleshooting. .


TC2199 (A12) failure in two patients.


① audio out of control. .


Overhaul procedures: using the remote control to adjust the sound, onscreen volume adjustment completely normal, multimeter measuring N701 (LC863324A-5W21) # 37 feet (mute) without any exception, replace N701 failed to resolve the problem, check the external components is no exception. It seems this issue should be set, enter the bus bus after careful examination and sound related options, when the stereo option setting for STEREO. .OPT status from 1 to 0, sound control back to normal.


② no plans are sound. .


Overhaul procedures: post sound normal, full shows only a large "field" (black and white), this signal channel, depending on the circuit should be properly, set the fault for the bus..


Solution: The black and white balance of C: B / W item of data from 3 to 0. (0: Normal image; 1: the dark state; 2: The bright state; 3: "fields" word) is to facilitate the adjustment of the balance between light and dark, image geometry, the geometric center of the set. .


(Haixin TC2199 machine bus access methods: first press the "alternate" key, then press and hold down the "volume" machine keys, press the "enter" keys Alternately, repeat these steps to turn into the factory State, and white balance, debugging, set the status.


Exit: repeat into operation from time to time, until the above four states away. Note: AC shutdown or remote off state can not be adjusted out of the bus! ). .


TC2175GD (A12) no characters.


Maintenance process: First measurement of N801 (LC863324A-5S15) in the # 21 feet (line of pulse reverse process input) voltage of 3. .3 V, # 20 feet (field inversion process pulse input) voltage is 4. .4 V, V803 of the base voltage is 0. .2 V, V804 of the base voltage of negative pressure, to determine horizontal and vertical pulse input is normal. Measurement N801 # 18 feet (characters oscillation filter) voltage of 2. .3 V normal, considering the characters in the N801 integrated internal oscillator circuit, test for N801 fault remains.Check the # 22-N801 # 24 feet of character output to the N201 # 14-# 16 foot characters between related components properly. Inspection found no blue screen when no signal, consider the potential and not on display for the measurement of the # 25 foot N801 (character HLR) voltage, normal signal when the output voltage is 0 .3V, no-signal output voltage: 3 .6V or so; actual. measure the voltage remains feet to 0.25, check # .1V feet the external circuit, find, replace, leakage capacitance C819 later troubleshooting.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Experience. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Online time. .


15 hours.


Registration time. .


2008-2-28.


Last Login. .


2008-10-16.


See more details. .


TOP 。.


Haier, Hisense television repair television repair television repair JVC TV repair Skyworth SVA TV repair. .


Tens of millions.


Maintenance Pvt. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


The user money.


0. .


Read permissions.


50. .


Personal space.


Send PM. .


Add as buddy.


Currently offline. .


8/f, l m s ° ? ' è?¨??? 2008-3-14 14: 18 ? ????è? ? ???è ? ….


TC1410L (A12) color anomalies. .


Overhaul procedures: pale red color image to close color saturation after black and white images correctly, measure N101 (LA76810) # 19 feet, # 20 feet, # 21 foot Tri-phosphor output voltage, found # 19 feet (red color output) voltage of 1 .5V, voltage offset. low (normal should be around 2. .25V), disconnect the external circuit No. 19 feet, the voltage has not changed. Suspected IC LA76810 inner exception after the failure, try substitution. Expand the scope of the inspection and repair, when measured 30 feet N101 # (line oscillation output), and found out that the voltage 0V, normal should be 0. .9V. Check N101 # 30-pin external resistor normal, suspected leakage capacitor C279, capacitor C279 when disconnected when the voltage is increased to 0. .9 V, color returned to normal, replace the capacitor C279 after troubleshooting. LA76810 # 30 feet (line oscillator output) Some machines do not use, maintenance should be attention. .


I. TDA884X movement.


1, type: TC2975AM. .


Trouble phenomenon: three free, lights.


Maintenance process: start measuring the output voltage switching normal transformer in each group, measured line to promote the B-voltage transistor V901 is 0. .7 V, C pole voltage, indicating line circuit is not working. Measurement N301 # 37 pin voltage is 8V, # 40 feet (line excitation pulse output) voltage to 1. .1 V, test a small signal processing integrated circuit TDA8843 substitution failure remains. Expand the inspection scope, comprehensive measurement of all the pin voltage N301 and found # 12 pin low voltage 3. .3 V, normal should be 8V, maintenance of its external circuit inductance L305 was found open, replaced the machine back to normal. .


2 models: TC3418F failure phenomenon: screen retrace lines, with remote control and keypad are malfunctioning.


Maintenance Process: According to a suspicion that the phenomenon of CPU failures working conditions are not met, the circuit is working correctly by checking CPU. Video amplifier circuit further inspection, the first measuring video amplifier IC N701 # 6 pin power supply voltage, the result is 0V, the normal should be 190V, check the external circuit resistance found in R710 (47Ω/2W) resistance to ∞, replace the resistor R710.Splash resistance R710 smoke, to conclude that there is short circuit parts, continue to measure depending on IC's # 6 foot N701, # 7 feet on the ground resistance, are both zero, N701 (TDA6108J) damage, and replace the R710 and N701 after troubleshooting.


3 models: TC2975AM failure phenomenon: the image drawing. .


Overhaul procedures: users reflect this phenomenon at the beginning of the sporadic, but this time is always appears the image drawing. Analysis of this phenomenon and the image if signal circuit, and the image if signal circuit in TDA8843 internal. Maintenance and fault-related pin # 5 feet of N301, # 6, # 13 foot, # 43 # 42 feet, feet, etc. When using the table amount measurement # 5 feet voltage image to return to normal, # 5 feet if PLL external RC filter circuit, overhauling its external circuit, open circuit resistance R302 was found after the replacement. Note: N301 # 5-pin external components C305 (100N/50V) Weld similar phenomenon also occurs. .


4. model: TC2975AF.


Failure phenomena: TC2975AM (TDA884X movement). .


Maintenance of process: the first measurement switching output voltage transformer for each group, + B voltage normal, non-24V, 8V, 12V output, suspected CPU control circuit, check N101 (MTV880) # 42 feet + 5V supply voltage normal, the collecting electrode V108 (N101 # 33 feet reset client) and low voltage and obvious change, check his/her ZD101 V108, external components, R141, R142, R145 are damage. N101 # 32 feet when measured voltage, the TV suddenly switched, to judge may be the X101 (12M crystal oscillator) poor performance, after the replacement of the device troubleshooting. .


5. model: TC3418F.


Symptoms: no pictures and sound. .


Overhaul procedures: this machine screen blurry colored streak, similar defocused failure. Check the Visual on the circuit of RGB 3 gun cathode voltage are about 150V trichromatic base electrode voltage of 2 .4V, measuring. depending on the IC N701 (TDA6107Q) # 5 feet (dark current detecting foot) voltage to rise to around 7. .9V. Analysis of Philips OM8838 small-signal integrated circuits and other movements that N301 # 41 feet Bisha pulse input, Bisha pulse by pulse, line backward pulse, backward pulse consists of three parts. Were examined with a three-part circuit, the final scene of output IC N801 (TDA8351) the existence of individual pin false welding, leading field blanking pulse abnormalities, affecting the sand castle pulse, the above phenomenon occurs, patching and troubleshooting later. Note: Philips movement in the maintenance-free grating failure should focus on examination of sand castle pulse are normal. .


6. model: TC2975AM.


Failure phenomenon: three without, lights. .


Overhaul procedures: check the power circuit found that the transistor V502, V505 also damaged, replace can post but raster instability. Measurement + B voltage instability problems suspected-stabilizing circuit short-circuit optocoupler N501 # 3, # 4 feet, measurement + B voltage 0V, description of the fault in optocoupler N501 ' circuit. Further inspection and replacement, the error amplification transistor V506, voltage regulator diode VD502 invalid measurement optocoupler N501 # 1 pin voltage is around 10V, 30V should be about normal, check the optocoupler N501 # 1 foot-powered resistor divider R526 resistance into a 300K, normal should be 47K, replacement troubleshooting. .


Second, TB1238 movement.


1, Model: TC2500. .


Trouble phenomenon: horizontal-line.


Maintenance process: first measuring field block and normal supply voltage, interference with the signal injection method into the pincushion correction signal IC N402 (TA8859CP) # 13 feet, horizontal bright line can instantly begin to illustrate N401, N402 are normal faults may appear in the small-signal IC N201, check the N201 (TB1238) associated with the field circuit pin # 23 pin, # 25 pin voltages are normal, further measurement # 28 feet H. .Supply voltage Vcc = 0V, disconnect peripheral component C219, # 28 feet voltage returns to normal after changing C219, on all the machine properly.


2 models: TC2910G. .


Trouble phenomenon: horizontal-line.


Maintenance process: first focus on field output power supply IC TA8427K normal, # 2 pin no output voltage, then detection of small signal processing IC N201 (TB1238) the relevant pin voltage are normal, with the oscilloscope measurements N201 # 24 foot field normal output waveform, which can determine the normal small-signal integrated circuits.Further processing IC school from the pillow N402 (TA8859CP) to check and found that its # 8 feet voltage is not working properly, and at the same time, the integrated circuit # 6 feet field feedback input pin voltage disorders, check # 6 foot N402 peripheral circuit, and eventually found resistance R406 (39K) is open, the replacement of the components after troubleshooting.


3 models: TC2900. .


Trouble phenomenon: burning memory.


Maintenance process: After the replacement of the memory as short as one day to one month will also damaged. Damaged phenomenon is sometimes not boot, Automatic Switcher, the image is compressed or the middle of the screen appears a line "B". When not switched on, measuring CPU # 7 feet (standby control pin) voltage of 3V, remote control, buttons are not working. Measuring CPU # 37 pin (SCL) voltage of 1. .4 V, # 38 pin (SDA) voltage of 1. .# 8, 4V N702 feet voltage is 5V, check its peripheral circuits are OK and suspected hook in bus components problems occur, they are the N201 (TB1238), N402 (TA8859CP), NC02 (TA8776N) as well as the CPU. When you disconnect the NC02 (TA8776N), bus voltage returns to normal, suspected adverse TA8776N internal circuitry, resulting in the bus in data communication process cat-and-mouse, thereby damaged storage while after replacing the N702 NC02 and troubleshooting. Note: In the repair process of the movement found TB1238 low bus voltage fault the majority of television and audio processing circuit TA8776N the proposed overhaul of such failures should be attention to the bus voltage measurement. .


III. TDA937X movement.


1, Model: TC2977. .


Trouble phenomenon: a figure without.


Maintenance process: the normal boot image no audio, audio amplifier integrated circuit test voltage of the normal foot. With the AV audio input signals, indicating normal audio amplifier circuit, so suspect the problem lies in the AV / TV converter circuit. When the tail after the demolition of what occurs when the audio, because A2 board to connector interfaces with the motherboard, suspect poor contact, ordered to pull back its plugged in, audio back to normal, no fault occurs again, a half-day observation. Note: If you experience no audio or audio TC2977 machine from time to time and we hope that we pay attention to check the board and the motherboard connector A2. .


2 models: TC2977.


Failure phenomenon: grating from time to time. .


Overhaul process: high-voltage, filament lit, grating patchy, machine experts at spark output transformer. Depending on the measuring circuit, only feet voltage normal acceleration voltage with striking sound in preliminary swing between 300V-150V, suspected output transformer internal spark, on substitution failure is still after. Surveying the pin voltage output transformer T401, when the table document a contact T401 # 7 feet, sparking an immediate disappearance of sound, then grating normal, so concluded that T401 # 7 pin external circuit problems, checked that the resistor R408 (10K / 2W) resistance has turned into a 170K, replaced troubleshooting. .


IV. H97B movement.


1, type: TC3418G. .


Symptom: there is no color.


Maintenance process: power observed no color PAL system conversion format is invalid, enter the factory state View BWN Item "0" normal. Test for Crystal G502, G503 failure remains the same, measuring N501 # 54 feet is only about 1V, the normal should be 3V, 9V power supply voltage test N501's normal, try changing C505 fault persists, suspect a small signal processing integrated circuit N501 problems , test the machine back to normal after substitution. There is little need to remind you: N501 # 54 drawings marked voltage is 5 feet. .8V, but TV Typ measured around for 3V, hope colleagues in maintenance attention.


2 models: TC2979. .


Trouble phenomenon: no brightness signal.


Maintenance process: start with the sound but the screen is not lit, press the volume key characters appear from time to time, suspected that the brightness channel fails, try changing the brightness of aircraft delay line, fault still. Measurement of small-signal IC N501 (TA8880) of the relevant pin voltage and found that N501 # 61 pin voltage is 0. .35 V, and the normal 2. .9 V very different, check parts of the foot outside the normal, suspected N501 damaged, replacement troubleshooting. .


5. A6 movement.


1, Model: TC2531. .


Trouble phenomenon: the blue tail.


Maintenance process: A6 movement in the screen when no signal should appear white Noise Wave point, careful observation of the machine, no signal about when the screen flashes once every 2 seconds flyback line flash blue flyback lines 5, 1 a red flyback lines; a signal when a blue tail. First measurement N201 # 33 feet (BY), # 34 feet (GY), # 35 feet (RY) voltage are 5V, the same voltage fault occurs.Due to the alternating red and blue, the measurement of Flyback line depending on tube blue gun V782 collector voltage 175V, while the base electrode voltage 100V-80V jitter, back and forth between normal voltage for 10V, check the resistance R793 (1/6W/8. .2K); electrolytic C792 (47UF 25V/) is the replacement of the bulge more components after troubleshooting.


2 models: TC2961D. .


Symptom: there is no color.


Maintenance Process: This machine format settings are correct but no color, measurement N201 # 1 pin voltage is 2V normal, # 17 feet (achromatic control side) voltage of 0V, shows small-signal IC N201 from the control circuit within the consumer color. First try to restore substitution color subcarrier oscillator Z421 (4. .43 MHz) is invalid, each inspection and color-related circuits, N201 # 26 foot line against the range of pulse input, # 43-pin sub-carrier automatic phase control filter circuit (APC), etc. and found N201 # 43 pin on the external bias circuit resistor R246 (12K) open, replaced troubleshooting. .


VI. other movements.


1, type: TDF2988 (film). .


Trouble phenomenon: upper retrace lines.


Maintenance process: first determine the presence of circuit failure, check the field output IC N301 (TDA8354) the # 4 pin 15V power supply voltage normal, the IC # 11 feet (V1-), # 12 feet (V1 +) voltage is normal, measuring # 5 pin output voltage is also normal. Check line output transformer T461 # 7-pin +45 V output voltage normal, while the supply TDA8354 # 7 pin voltage is only 20V, obviously low.Check resistance R345 end voltage normal, the other end of the voltage has less than half the supply voltage, the fault should present output IC N301 # 7 feet and resistance, the ultimate R345 found leakage electrolytic C352, replace the symbol after troubleshooting.


2 models: TC3489D (TB1251). .


Trouble phenomenon: automatic shutdown.


Maintenance process: start watching about 15 minutes automatic shutdown, the red light. Standby button on the remote control can turn to illustrate the circuit action is not a Weld or protection. Open the back cover has no abnormal vibration circuit board, a time no start. After asking the user to know when not playing VCD image, VCD released from there when the image started to find articles for the ramp, similar to the line are not synchronized, and when TV images normal.Analysis from drawings, AV and TV image signal N1101 # 32 feet from its output through R245, V208 to N201 (TB1251) # 39 feet; the other one with V211 R246 → → V212 to # 13 feet of N701 as the CPU of the radio identification signals. Discovered by the above analysis, the automatic without memory, so you can narrow the scope of a basic failure to a level of resistance R246 circuit, open circuit resistance R253 identified, troubleshooting after the replacement. Because the resistance of R253 open circuit, causing the radio identification signal can not reach N701 of the # 13 foot, so that no signal CPU mistake to issue the shutdown command shutdown. .


3. model: TC2199D (A12).


Symptoms: left of the screen with purple belt. .


Overhaul procedures: according to the user to see the failure is sometimes reflected in one or two hours later, so first some suspected line circuit components not good thermal stability, focusing on detecting line drive pipe and line pipe, but that is not valid. Then use the oscilloscope measurement LA76810 # 27 feet (line of excitation pulse output) as well as the promotion of the waveform, the transformer line b promoting triode V431 C very, very few waveform, found the waveform is an unusual spikes. Carefully check the line Circuit found that the output pipe for the emitter with a wear-core inductor L432, aims to improve the row before and after the peak pulse along. This failure may be related to the inductor, since no hand with the type inductor, a temporary fault with a lead disappear immediately. Then measuring the original oscilloscope abnormal spike has disappeared. .


4. model: MT2117 (multimedia).


Failure phenomenon: automatic shutdown. .


Overhaul procedures: power-on shut down automatically after 30 minutes, turn off the power on again after the main power supply and automatic shutdown. Automatically shutdown when measuring relays J108 does not work, there is no voltage 300V, judge + quad CPU should be in control of parts of or the protection circuit. Power measurement of SCR VD826 # 1 foot slowly rise, found the voltage rises to 3 .6V, relay broken., shut down. The desk-to-channel measurement for disconnected line circuit protection, bad check not find bad, try replacing the voltage rise after no longer VD478, commissioning no longer automatically shutdown, troubleshooting.


5, Model: SR7123 (TA8659). .


Trouble phenomenon: no raster, sound.


Maintenance process: the phenomenon of judging according to fault appears in the video amplifier circuit fault, measured as the discharge pipe Q505, Q508, Q511's C voltage to 170V, three-color excitation measurements found transistor Q506, Q509, Q512 B-pole voltage, so that as the release transistor is off. Normal working voltage should be B 11. .5 V, check around the bad parts not found. B-tricolor very encouraging transistor Q516 through diode and the C very connected, very measured Q516 B-0. .7V, Q516 breakover voltage is extremely low, C, b-pole disconnect Q516, post a grating but top, Flyback line of b after Q516 R302 and field block IC301 (TA8427K) # 6 feet, thus suspected bad TA8427K internal, troubleshooting after the replacement. Note: the fields marked SR7123 drawing output manifold AN5521 is the model of the actual use is TA8427K, it is important to note.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Experience. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Online time. .


15 hours.


Registration time. .


2008-2-28.


Last Login. .


2008-10-16.


See more details. .


TOP 。.


Appliance parts wholesale, welcome to our colleagues! . .


Tens of millions.


Maintenance Pvt. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


The user money.


0. .


Read permissions.


50. .


Personal space.


Send PM. .


Add as buddy.


Currently offline. .


9/f, l m s ° ? ' è?¨??? 2008-3-14 14: 18 ? ????è? ? ???è ? ….


Hisense brand SR7123 (TA8659) without grating with audio. .


According to the symptoms to determine fault occurs in depending on the circuit, depending on tube Q505, Q508, Q511 c extreme voltage 170V, measuring trichromatic incentive transistor discovered Q506, Q509, b. Q512.


No voltage, so that as the discharge transistor is off. Normal working voltage should be B 11. .5 V, check around the bad parts not found. B-tricolor very encouraging transistor Q516 through diode and the C. .


Very attached to the measuring Q516 B 0 .7V, great. c Q516 breakover voltage, low, off, b Q516 on a grating but top, Flyback line of b after Q516 R302 and field block.


IC301 (TA8427K) connected to the # 6 foot, so suspected TA8427K cause internal bad, replaced troubleshooting. Note: SR7123 drawings on the subject of field output manifold block model is AN5521, actually. .


Using TA8427K, it is important to note.


Hisense brand failure example MT2117 (multimedia) automatic shutdown. .


Power-on shut down automatically after 30 minutes, turn off the power on again after the main power supply and automatic shutdown. Automatically shutdown when measuring relays J108 does not work, there is no voltage 300V, judge + quad CPU should be in the control part or insurance.


Protection circuit. SCR VD826 boot measurements found voltage # 1 foot rise slowly, to rise to 3. .6 V disconnected when the relay off. Measured by the by-road off to determine the line of circuit protection due to the poor, the prosecution. .


Search does not find bad, try replacing the voltage rise after no longer VD478, commissioning no longer automatically shutdown, troubleshooting.


Hisense brand failure example TC2199D (A12) left of the screen with purple belt. .


According to the user to see the failure is sometimes reflected in one or two hours later, so first some suspected line circuit components not good thermal stability, focusing on detecting line drive pipe and line pipe, but that is not valid. Then use the oscilloscope.


Volume LA76810 the # 27 foot (line excitation pulse output) of the waveform and the line to promote the transformer, line transistor V431 to promote the very B-, C polar waveform, the waveform points are found that there was a non-normal. .


The spikes. Carefully check the line Circuit found that the output pipe for the emitter with a wear-core inductor L432, aims to improve the row before and after the peak pulse along. This failure may be related to the inductor.


Relevant, since no hand, the same type inductor, a temporary fault with a lead disappear immediately. Then measuring the original oscilloscope abnormal spike has disappeared. .


Haixin failure instance TC3489D (TB1251) automatically shut down.


Start watching about 15 minutes automatic shutdown, the red light. Standby button on the remote control can turn to illustrate. .


Not soldered or protection circuit. Open the rear door vibration Board also signs start time. After asking the user to know when playing a VCD and no image, from there to find-and-drop.


VCD, images stripes, similar to the line are not synchronized, and when TV images normal. Analyzed from the drawings, AV and TV image signal by the N1101 from # 32 pin output, all the way through R245, V208 to N201 (..


TB1251) # 39 feet; the other one with V211 R246 → → V212 to # 13 feet of N701 as the CPU of the radio identification signals. Discovered by the above analysis, the automatic memory, so when I do not fault the van.


Wai resistor R246 can be basically reduced to post-stage circuit, and upon inspection found that resistor R253 open circuit, replaced troubleshooting. Because the resistance of R253 open circuit, causing the radio identification signal can not reach N701's. .


# 13 foot, so that the CPU for no signal, issue the shutdown command to shut down.


Failure instance TDF2988 (film) upper flyback lines. .


First of all determine the presence of faults, check the field circuit output IC N301 (TDA8354) # 4 pin power supply voltage 15V properly, an integrated circuit # 11 feet (V1-), # 12 feet (V1 +) positive voltage.


Chang, measuring the output voltage pin # 5 normal. Check line output transformer T461 # 7-pin +45 V output voltage normal, while the supply TDA8354 # 7 pin voltage is only 20V, obviously low. Check resistor R345 1. .


Terminal voltage normal, the other end of the voltage has less than half the supply voltage, the fault should present output IC N301 # 7 feet and resistance, the ultimate R345 found leakage electrolytic C352, replace the the symbol.


After troubleshooting. .


Fault instance TC2961D (A6).


This machine format settings are correct but no color, measurement N201 # 1 pin voltage is 2V normal, # 17 feet (achromatic control side) voltage of 0V, shows small-signal IC N201 internal circuit from the consumer color. .


Controlled. First of all, try replacing colour subcarrier recovery Crystal Z421 (4. .43MHz) does not work, check with the color # N201 related circuit, 26 foot line backward pulse input, # 43 feet subcarrier phase control automatically.


System filter circuit (APC) and in the end found that N201 # 43-pin peripheral circuit bias resistor R246 (12K) open, replaced troubleshooting. .


Fault instance TC2961D (A6) Blue tail.


A6 movement in the screen when no signal should appear white Noise Wave point, careful observation of the machine, no signal about when the screen flashes once every 2 seconds flyback line flash 5 blue flyback lines, 1 red back. .


Scan line; the signal appears blue tail. First measurement of the N201 # 33 feet (B-Y), # 34 feet (G-Y), # 35 feet (R-Y) voltage is 5V, failure to appear is unchanged. Because the turn out.


Are red, blue flyback lines, measured as the discharge tube V782 blue gun collector voltage of 175V, while the base voltage of 100V-80V jitter back and forth between the normal voltage should be 10V or so, check the resistance of R793 (..


1/6W/8. .2K); electrolytic C792 (47UF 25V/) is the replacement of the bulge more components after troubleshooting.


Failure instance TC2531 (A6 movement) blue tail. .


A6 movement in no signal screen should appear white hot wave, careful observation of the machine, no signal screen every 2 seconds flashing a Flyback, Flash 5 blue, Flyback line back to the 1st red.


Scan line; a signal when a blue tail. First measurement N201 # 33 feet (BY), # 34 feet (GY), # 35 feet (RY) voltage are 5V, the same voltage fault occurs. Turn out as. .


Are red, blue, Flyback line depending on the measurement of blue gun tubes V782 collector voltage 175V, while the base electrode voltage 100V-80V jitter, back and forth between normal voltage for 10V, check the resistance R793 (.


1/6W/8. .2 K) has been blown, electrolysis C792 (25V/47UF) has drum package, replace the components after the above troubleshooting. .


Fault instance TC2979 (H97B COB) no brightness signal.


Boot screen with sound but not light, press the volume key characters appear from time to time, suspected that the brightness channel fails, try changing the brightness of aircraft delay line, fault still. Measured small-signal integrated circuits. .


N501 (TA8880) pin voltage, # 61 feet found N501 voltage of 0. .35V, and normal 2. .9V far, check the foot peripheral component correctly suspected N501 damaged, replace it after.


Exclusion barrier. .


Fault instance TC3418G (H97B COB) no color.


PAL system power observed no color, format conversion is invalid, enter the factory state View BWN Item "0" normal. Test for Crystal G502, G503 failure remains the same, measuring only 1V N501 # 54 feet around. .


Normal logging for 3V, 9V power supply voltage of N501 properly, try swapping C505 fault persists, suspected small signal processing IC N501 problems, try the machine back to normal after substitution. Here is a..


Points need to remind you: N501 # 54 foot drawing marked voltage is 5. .8 V, but the TV when measured normal to 3V or so, I hope when you peer in the maintenance of attention. .


Fault instance TC2977 (TDA937X COB) grating patchy.


Start with high voltage, filament light, grating from time to time, machine output transformer Department experts have ignition noise. Measured as the release of all integrated circuit voltage of the normal foot, and only speed up the voltage with the ignition sound in. .


300V-150V preliminary swing, between suspected output transformer internal spark, on substitution failure is still after. Measurement of the output voltage of the transformer T401 feet, when a contact table # 7 foot T401, play.


Immediately sound the fire disappeared, then returned to normal grating, so determined T401 # 7 pin external circuit problems, checked that the resistance of R408 (10K/2W) resistance has turned into a 170K, replaced troubleshooting. .


Fault instance TC2977 (TDA937X COB) Figure No sound.


Normal boot image no audio, audio amplifier integrated circuit test voltage of the normal foot. With the AV audio input signals, indicating normal audio amplifier circuit, so suspect the problem lies in the AV / TV converter. .


Circuit. When removing the audio when the tail plate appear, as a result of the A2 and motherboard connector for the connector, the suspicion that it is bad, then disconnect the plug which is good, sound back to normal, half-day yet.


The fault occurs again. Note: If you experience no audio or audio TC2977 machine from time to time and we hope that we pay attention to check the board and the motherboard connector A2. .


Fault instance TC2900 (TB1238 COB) burning memory.


After the replacement of the memory as short as one day to one month will damage. Damaged phenomenon is sometimes not boot, Automatic Switcher, the image is compressed or the middle of the screen appears a line "B". When not. .


Post # 7 feet measured CPU (standby control foot) voltage of 3V, remote control, press work. Measuring CPU # 37 feet (SCL) voltage is 1.38, # .4V (SDA) voltage to 1 .4V,... "


N702 # 8 pin voltage is 5V, check the external circuit were normal, suspected mount components on the bus problems, which are N201 (TB1238), N402 (TA8859CP),. .


NC02 (TA8776N) as well as the CPU. When you disconnect the NC02 (TA8776N), bus voltage returns to normal, suspected adverse TA8776N internal circuitry, resulting in the bus in data communication process cat-and-mouse.


When bad, so damaged memory, and after replacement of NC02 and N702 troubleshooting. Note: In the repair process of the movement found TB1238 low bus voltage fault the majority of television and audio processing circuit TA8776N. .


Relevant, it is recommended that the maintenance of such a failure should be aware of the bus voltage measurements.


Failure instance TC2910G (TB1238 movement) level light line. .


First of all examine the field output IC, power supply normal TA8427K # 2 feet, then no output voltage detection of small signal processing IC N201 (TB1238) pin voltage normal,.


With the oscilloscope measurements N201 # 24 foot field normal output waveform, which can determine the normal small-signal integrated circuits. Further treatment from the school pillows IC N402 (TA8859CP) started checking, hair. .


Now the # 8 feet voltage is not working properly, and at the same time, the integrated circuit # 6 feet field feedback input pin voltage disorders, check # 6 foot N402 peripheral circuit, and eventually found resistance R406 (39K) is open, the element to replace.


Pieces after troubleshooting. .


Fault instance TC2500 (TB1238 COB) level off line.


First measurement of field block and normal supply voltage, interference with the signal injection method into the pincushion correction signal IC N402 (TA8859CP) # 13 feet, horizontal bright line can instantly start. .


To illustrate both the normal N401, N402, fault may occur in the small-signal integrated circuits, check the N201 N201 (TB1238) and the field circuit related pin # 23, # 25 feet voltage normal, further testing.


Volume # 28 foot H. . Vcc supply voltage to 0V, disconnect the external devices C219, # 28 pin voltage returns to normal after the test-for-C219 machine as usual. .


【 Failure instance TC2975AM (TDA884X COB) three lights.


Check the power transistor circuits found in V502, V505 also damaged, replacement can boot but the grating unstable. Measurement + B voltage instability problems suspected regulator circuit, short circuit optical tweezers. .


Electricity coupler N501 # 3, # 4 feet, measurement + B voltage 0V, description of the fault in optocoupler N501 ' circuit. Further inspection and replacement, error amplifier transistor V506, regulators.


Diode VD502 invalid measurement optocoupler N501 # 1 pin voltage is around 10V, 30V should be about normal, check the optocoupler N501 # 1 pin power supply into a voltage divider resistors R526 resistance of 300K. .


For the normal, replace the 47K after troubleshooting.


Failure instance TC3418F (TDA884X movement) No plans have sound. .


This machine screen blurry colored streak, similar defocused failure. Check the Visual on the circuit of RGB 3 gun cathode voltage are about 150V trichromatic base electrode voltage of 2 .4V, measuring. depending on the integration of power.


Road N701 (TDA6107Q) # 5 feet (dark current detection pin) voltage increases to 7. .9 V or so. Analysis of small-signal IC OM8838 Philips and other movement difference is N301 # 41 foot sand castle pulse. .


Blanking pulse input, sand Castle by pulse, line backward pulse, backward pulse consists of three parts. Three part circuits, respectively, the final scene of output IC N801 (TDA8351).


Existence of false individual pin welding, leading field blanking pulse abnormalities, affecting the sand castle pulse, the above phenomenon occurs, patching and troubleshooting later. Note: In the maintenance-free grating Philips fault movement. .


The key to check whether the normal Bisha pulse.


Failure instance TC2975AM (TDA884X movement) 3 non-illuminated. .


First measurement switching output voltage transformer for each group, + B voltage normal, non-24V, 8V, 12V output, suspected CPU control circuit, check N101 (MTV880) # 42 feet + 5V power supply.


Pressure normal, V108 collector (N101 # 33 pin reset port) voltage level without significant changes, check the external components V108, ZD101, R141, R142, R145 had no damage. When measuring N101. .


# 32-foot sudden voltage, TV on, judgment X101 (12M crystal oscillator) performance, replace the symbol after troubleshooting.


Failure instance TC2975AM (TDA884X movement) image drawing. .


The user begins this phenomenon is reflected in a patchy, but it was always appears the image drawing. Analysis of this phenomenon and the image if signal circuit, and the image if signal circuits are integrated.


TDA8843-house. Maintenance and fault-related pins, N301 pin # 5, # 6 feet, # 13 foot, # 42 foot, feet, etc. # 43. When using tables to pen measure the voltage when the pin # 5 image back to normal, # 5 feet. .


Is a medium-frequency phase-locked loop external RC filter circuit, overhauling its external circuit, open circuit resistance R302 was found after the replacement. Note: N301 # 5 foot peripheral component C305 (100N/50V) soldered are out.


Is similar to the phenomenon. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


Experience.


0 points. .


The user money.


0. .


Read permissions.


50. .


Online time.


15 hours. .


The time of registration.


2008-2-28. .


Last logged in.


2008-10-16. .


View detailed information.


TOP. .


Haier, Hisense TV TV repair maintenance Skyworth TV JVC TV repair, maintenance of radio and television repair.


Million. .


Maintenance of private.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Personal space. .


Send text messages.


Add as a friend. .


Currently offline.


10th Floor, medium and small on 2008-3-14 14:19 it happened. .


Fault instance TC3418F (TDA884X COB) screen retrace lines remote control and keypad are malfunctioning monthly 0303.


According to a preliminary suspect fault phenomena do not have the CPU working conditions, the circuit is working correctly by checking CPU. Video amplifier circuit further inspection, the first measuring video amplifier IC N701 # 6 pin power supply voltage. .


The result is the 0V, normal, should check their perimeter 190V Circuit found resistance R710 (47 Ω/2 W) resistance to ∞, replace the R710 resistance. Splash resistance R710 smoke, to conclude that there is short circuit parts, following.


Continued measuring video amplifier IC N701 of the # 6 pin # 7 feet on the ground resistance, are zero, indicating N701 (TDA6108J) damage, while replacement of R710 and N701 after troubleshooting. .


Fault instance TC2975AM (TDA884X) three-monthly no. lighted 0303.


Maintenance process: start measuring the output voltage switching normal transformer in each group, measured line to promote the B-voltage transistor V901 is 0. .7 V, C pole voltage, indicating line circuit is not working. Measurement N301 # 37. .


PIN voltage 8V, # 40 feet (line of excitation pulse output) voltage to 1. .1V, try replacing small signal processing IC TDA8843 fault still. Expand the scope of the inspection and repair, comprehensive measurement N301 all pin power.


Pressure and found # 12 pin low voltage 3. .3 V, normal should be 8V, maintenance of its external circuit inductance L305 was found open, replaced the machine back to normal. .


Fault instance TC2980F (OM8838) AV1, AV2 properly.


TV / AV conversion, AV1 first "white board" post-normal, fault should focus on N1001 (HEF4053) itself and the surrounding components. Search surrounding components were normal, and normal voltage conversion. .


N1001 # 3 feet for AV1 input. # 5 feet to the av2, # 4 feet for AV video output, sent to N301 (OM8838) # 17 feet. 3, of the N1001 4 feet after connecting, the AV1 video signal directly into.


N301, AV1 normal at this time, after the replacement of a new HEF4053, troubleshooting. .


Fault instance TC2560 (K4SC) the lower part of the image slightly Pincushion distortion.


The machine's pillow in a special school a small circuit board (A4 sheet), measurement of small plate-27V power supply properly, adjusting the pillow school potentiometer changes the image slightly. Failure is only the lower part of the phenomenon of distortion. .


That the suspect may be due to a bias resistor exception, check the small plate on the resistance, RD14 (1/6W 10K) its resistance has become larger to 30K, replaced and the machine back to normal.


Failure instance SR5417 (M11) image curling. .


Turn on logging field divider on the tube V402 c voltage to 27V, E voltage divider for 19V, is not working properly. On the tube V402, renewed, fault V403 still checked around components have yet seen.


Exception. Analysis may be due to poor market feedback caused the N501 (AN5435) # 10 feet of the external circuit, and found R415 (1/6W 10K) has become 16K, replaced the machine back to normal. .


Fault instance TC2511A (A9) Pincushion distortion.


The machine pillow school circuit mainly V461, V462 and peripheral components, measuring the operating voltage of two transistors and found that V461 emitter voltage is very low, normal should be around 10V. Backward. .


The pillow-output circuit, and eventually found VD439 (ERB44-04) was short, replacement, and troubleshooting.


Failure instance TC2139C (A6) level light line. .


Turn on logging field block N501 (LA7837) power supply, voltage measuring other foot, no doubt field block. Forward search field excitation signal, that is, the N201 (LA7687A) # 20 feet, when the table stroke.


To the foot, the grating immediately opened. Determine the problem lies in the feet of the external circuit, and upon inspection found that R362 (1/6W 22K) open circuit, replacement, troubleshooting. .


Fault instance TC2980 (H97C), there is no signal.


Automatic search in Taiwan, this should appear Noise Wave point, this machine is a black screen. AV input with a signal, suggesting that the fault lies in the discharge circuit, Charles N201 (OM8361) associated with the release of all. .


PIN voltage are OK, try to swap images demodulation week is not valid. Signal circuit, from N201 # 7 to # 13 feet with a capacitive coupling directly, the result is still no signal. When the foot from # 7 to # 15 coupling.


Feet, but not synchronize the images appeared. # 15 pin external video signal input, AV has been in a state of N201. Test # 16 feet is always high, checking the external circuit inductance was found. .


L210 (10uH) open-circuit, after normal image.


Failure instance TC2980 (H97C) button does not function. .


At the beginning of the press also occasionally post, i.e. after a few seconds. Direction N71 (CPU) # 33, # 34 key input pin voltage changes, and normal CPU does not perform the corresponding command, try swapping N71.


, The fault still. Often think of this movement under the bias circuit for power sampling resistor R330 open circuit failure caused by keys, test R330 normal analysis is due to interference effects within the power of the CPU's work. Check power. .


Source internal components, measured R320 (2W 6.8 Ω), replacement, and troubleshooting. This resistance power recovery path, have cited anti-interference ability.


Failure instance TC2181F (A12) contrast control. .


Power on after the image is very light, fluffy, and contrast control, analysis of the fault may lie in ABL circuits. Measuring the N201 (LA76810) of supply voltage are OK, # 13 feet voltage.


Only 3V, the normal should be 4. .2 V, check the external circuit, and found R251 (1/6W 15K) has been open, for after all the normal boot. .


Fault instance TC2959DNP (XK-94C) level off line.


The pin block N301 measured field voltage obvious abnormality was found, the external circuit is also not found anomalies, measured N302 (TA8859) # 3-pin 12V power supply normal, but the bus voltage is very low. Measurement and other integrated block. .


The CPU's bus voltage is low, check the bus-powered generator that QA02, DA01 QA12, composed of circuits, found no negative side DA01 12V power supply, and the whole other 12V are OK and doubt.


There is a broken board phenomenon, with a wire connected to the machine back to normal. .


Fault instance TF2988 (TB1238) AV signal high brightness.


This machine normal television signals, while the AV input image brightness is high, as the video signal input terminal few external components, the external video signal through the R817, VD802, C203 straight into. .


N201 # 41 feet, check these components correctly, try swapping N201 (TB1238) is not valid, a careful analysis of the line is found, in order to improve the video channel characteristics and meet the requirements of different signal brightness, AV input.


A DC level compensation circuit, when the circuit in the AV state, the CPU (N701) # 19 feet high issue, so V805, VD801 turn, added to the video input, to provide different signal. .


A fixed DC level, measuring both parts have been changed after the machine breakdown, back to normal.


Failure instance TC2588A (TB1238) normal blue screen state full screen image flyback lines. .


Check the foot TB1238 voltage normal, normal blanking is also the cause of the failure may be related to replace the data bus, a new memory block N702 (24C08), everything is normal. The original deposit.


Replace the storage device in situ, fault is still open bus data, adjust the "VM1" entry to "00" after troubleshooting. When the data is "01" or "03" when the failure. .


Fault instance TC2975 (A6) U section programs, cold-boot time, engine properly.


Each pin voltage measuring U101, UB foot found when the cold boot 6V, heat recovery to normal 12V voltage. Cold boot when disconnected after the pin, 12V power supply normal, connected, the voltage drop. .


6V, try swapping the tuner is not valid. Check the external circuit, R106 (1/6W 47K) has become, after replaced 57K, troubleshooting.


Failure instance TC2975 (A6) does not exist Taiwan, and audio out of control. .


Automatic, single number changes, but found out later, are not stored, and memory blocks are damaged, after the replacement is not valid. From the audio out, because of the native sound volume control is by bus.


And therefore, check the audio control block N3401 (TDA8424) bus pin # 11, # 12 are 12V, the normal should be 5V, the internal short circuit of the block, the bus voltage is also connected with the memory block N802 and more. .


After changing, troubleshooting TDA8424.


Hisense brand TC2539 (A6) images from time to time-line games are not synchronized. .


Fault instance TC2539 (A6) image is not scheduled to be out of sync with the row field.


First check the sync separator circuit is not abnormal, measurement N201 # 10 pin voltage is low, test # 8-pin voltage is normal, check V181, V182, V183 and V184 circuit composed of the normal. When found, as. .


Frequency switch block N1002, measuring 1 foot low voltage 0V, 3 feet, 8 feet of 0 .7V, 9 feet! to 5V, 1 with capacitive crossover to 8 feet and heels, the image back to normal. Suspected adverse N1002 (LA7221), swap.


After the failure still. 3 feet for the AV video input, when the normal 2. .5 V, off the foot, the image correctly, check the external components, we found VD1001 (11V zener diodes) have breakdown, replacement. .


, Troubleshooting.


Failure instance TC2539 (A6) color abnormal. .


In the middle of the screen there is a vertical green belt width 10cm, two-color image analysis is normal, abnormal color circuit, due to the failure of strange, suspected adverse LA7687, after the replacement is not valid.


Careful observation revealed that after the turn off the color, normal black and white images to illustrate the problem may be in the color difference signal processing circuit. Baseband 1H Delay Manifold measured N271 (LC89950) the pin voltage is normal. .


And, finally, try to swap N271, troubleshooting.


Failure instance TC2589 (TB1238) field amplitude compression and linear bad. .


According to the judgment in the presence of the phenomenon of failure out, according to the feedback circuit circuits components with AC and feedback, no exception, replace the N401, N402, are invalid. Carefully measuring the feet work manifold..


Pressure, we found that N402 (TA8859) # 3 pin 12V power supply voltage into 13V. Charles 12V generating circuit, three-terminal regulator suspected N551 (AN7812) bad, replaced the machine back to normal. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


Experience.


0 points. .


The user money.


0. .


Read permissions.


50. .


Online time.


15 hours. .


The time of registration.


2008-2-28. .


Last logged in.


2008-10-16. .


View detailed information.


TOP. .


Singular landscape stereo sound maintenance repair malanshi sound maintenance repair Sony nec stereo audio power amplifier repair maintenance Tianlong Yamaha audio amplifier repair maintenance for nobility.


Million. .


Maintenance of private.


Post. .


44.


Essence. .


2.


Points. .


149 min.


Prestige. .


0 points.


Users currency. .


$ 0.


Read permissions. .


50.


Personal space. .


Send text messages.


Add as a friend. .


Currently offline.


11th Floor, medium and small on 2008-3-14 14:19 it happened. .


Fault instance TC2511A (A9) power on automatically.


Power, the deputy press the power switch, and instantly a grating there, and then automatic protection, CPU # 41 pin voltages less than 1V, disconnect the pin peripheral circuit, the +5 V and pin # 41 connected after boot. .


, Images, and sound. Description of the problem lies in the protection of the detection circuit, drain the Protection Branch, when the filament detection protection circuit VD468 disconnect power is no longer protected, a..


All normal. Identified R476 (1/6W 2. .2 K) open, replacement, troubleshooting. The negative resistance open circuit voltage caused by VD468 close 0V, diode conduction, the CPU # 41 feet at low voltage clamp. .


And protection actions.


Failure instance TC2125C (A3) cold boot slow. .


Usually that pipe, block caused by damp, energized, filament voltage 0V, measured as output the voltage, the voltage is no doubt the line circuit does not work, measuring line driven supply voltage 0V, for. ..


Measuring power output voltage +180 V, +110 V, +12 V were normal, while the +24 V down a lot, for 12V, measured rectifier diode VD553 normal, and the negative terminal AC voltage normal, disconnect the R550, the voltage remains. .


Low, and eventually found 24V filtering electrolytic C563 (35V 330uf) leaks the fluid, replacement, and troubleshooting.


Example of the image and the upper fault with flyback lines, the lower without images. .


First of all check the field block supply side # 6 feet voltage low, # 3 foot 15V power supply correctly. Check the power supply has open circuit resistance R807, resistance and power on the level of bright line, according to the experience of the judgement field block.


M801 has been damaged, measured between the power supply pin and ground resistance are very small, basically short-circuit condition in the replacement market after block TDA8351, troubleshooting. This failure has been revised too much television sets, are these two. .


Damage. In addition TC2980F also repaired more than one level in the light of TV, typically N801, R807 and R806 damaged, many others noted colleagues.


Failure instance TC2940 (91SB) dark picture, no character. .


First test the circuit voltage, + 24V, 12V B, etc. are normal, filament lit, intensify the accelerator, a whiteboard, suspected adverse bus. Measuring bus voltage is found in the SDA line 3 ~ 4V.


Between changes in the normal SCL line, the E pole disconnect VA02, the measured voltage E is still not normal, indicating the problem lies in front of the circuit. After a search, the final found RA01 (1/6W 18K) open,. .


After the replacement, and troubleshooting.


Failure instance TC2975 (A6) found no signal station. .


Detection voltage normal, VT AFT changes correctly. N201 # 2 feet to 0V, no recognition signal output, look for the normal, R859 TV/AV when converting, N801 # 40 feet 0 .7V ~ 2. changes to normal, and when using AV. ..


, Good picture, but no TV output. Pin voltage is measured normal N201 # 8, # 1, pin control side is normal. Analysis of the problem lies in the large video signal output to the input circuit between the replacement of video conversion block. .


Is not valid. When logging into V184 (C536), found it extremely CE has breakdown, to replace a new transistor, the TV back to normal.


Failure instance TC3439DNP (XK-94C) as a negative image. .


According to the symptom, suspected fault follows the luminance channel, measuring N501 (TA8783) supply voltage and the bus are OK, and then measuring the brightness and the # 56, # 57, # 58 pin voltage, found # 57.


Pin voltage is not normal, low, substitution of external clamping electrolysis C205 (50V 0. .47 Uf) after troubleshooting. .


Fault instance TF2999N (H97B) three.


According to fault phenomenon, first disconnect the line load, short-circuit the standby control tube VQ828 the CE very, boot light does not shine, the interruption in the power supply inside out. So more power protection circuit, so. .


Disconnect the protection circuit-by-case basis. First off, the abolition of the low-voltage protection R868, disconnect VD821 R840 delay via various, over-voltage protection, over-current protection circuit R833 cancel feature, turn on logging switch tube C..


300V very normal, B pole O. .6 V, did not start oscillating, check all the positive feedback circuit components, no bad parts, test-for-C820 (18N), boot + B back to normal. Access R868, VD821, R840, R833 and line. .


After loading, the complete return to normal.


Failure instance TF2999N (H97B) without character. .


Overhaul procedures: this machine with no characters, other features are working properly. First of all CPU with oscilloscope (H97B-5H31-3358) # 26 and # 27 feet foot H-SYNC V-SYNC character positioning pulse signal transmission.


Into normal, test # 28, # 29 feet OSD character oscillation waveform is normal, suspect CPU internal damage, after changing back to normal. .


Fault instance TC2961D (A6) Dim plate, the characters appear correctly.


Maintenance process: suspected luminance signal is lost, because N201 # 8, # 10 feet is almost the same potential, clamp the short circuit, the grating to the normal snow point, the interruption in the N201 # 8 and # 10 feet feet. .


Between circuits, according to C182 (100P) ceramic capacitor leakage current, replace after troubleshooting. R189 is also vulnerable to corruption can also cause this failure.


Failure instance TC2961D (A6) grating dark. .


Overhaul procedures: debugging acceleration voltage is invalid, defective ABL circuit, measuring the power supply pin voltage N201 are normal, but the # 11 feet .3V voltage is 0., normally the feet voltage.


Not less than 2V, # 13 pin voltage is measured normal bus voltage measured and found # 18 pin voltage is 0V, measured N801 # 23 foot is not normal, disconnect the # 23 pin, voltage change, judging N801 (LC864512-5D18 ..


) Is damaged, replace after troubleshooting. In addition, the N201 # 11 feet peripheral resistance R211 damage can also cause this failure.


Failure instance TC2929DSP (XK-94C) whiteboard. .


Measuring the N201 (UPC1423CA) # 48, # 44, # 43 voltage normal, measurement # 42 clamp Terminal voltage 0V, disconnect # 42 .2V voltage = 2., and peering point hot wave screen image appears, and also in..


Images are not synchronized, by measuring C414 (2200P) leakage caused by, for C420 as usual. .


Fault instance TC2929DSP (XK-94C) line offset (and sometimes out of sync).


Measurement N201 (UPC1423CA) # 40 rows AFC circuit voltage lower, check C419 normal. The measurement of VD419 (IS1553) line pulse rectifier leakage, resulting AC voltage input N201 # 41. .


The heat exchanger VD419 fault disappears.


[The posts Last edited by the millions on 2008-3-14 14:25]. .


Post.


44. .


Essence.


2. .


Integral.


149 min. .


Prestige.


0 points. .


Experience.


0 points. .


The user money.


0. .


Read permissions.


50. .


Online time.


15 hours. .


The time of registration.


2008-2-28. .


Last logged in.


2008-10-16. .


View detailed information.


TOP. .


Haier, Hisense TV TV repair maintenance Skyworth TV JVC TV repair, maintenance of radio and television repair.


wzs1978. .


Maintenance of Colonel.


Post. .


1640.


Essence. .


4.


Points. .


2303 points.


Prestige. .


2035 points.


Users currency. .


$ 0.


Read permissions. .


90.


Personal space. .


Send text messages.


Add as a friend. .


Currently offline.


12th Floor, medium and small on 2008-3-26 18:43 it happened. .


Thanks for sharing.

















Post. .


1640.


Essence. .


4.


Points. .


2303 points.


Prestige. .


2035 points.


Experience. .


1449 points.


Users currency. .


$ 0.


Read permissions. .


90.


Sex. .


Male.


From. .


Shijiazhuang city Hebei province.


Online time. .


546 hours.


Registration time. .


2007-6-11.


Last Login. .


2009-1-2.


See more details. .


TOP 。.


Landscape maintenance strange sound sound sound sound maintenance Marantz repair nec Denon audio amplifier repair maintenance repair Sony Sound Yamaha audio amplifier repair maintenance Tin Yat. .


Ming hui.


Maintenance of Lieutenant. .


Post.


168. .


Essence.


0. .


Integral.


72. .


Prestige.


22 points. .


The user money.


0. .


Read permissions.


30. .


Personal space.


Send PM. .


Add as buddy.


Currently offline. .


13/f, l m s ° ? ' è?¨??? 2008-3-26 20: 05 ? ????è? ? ???è ? ….


This is great information, thank you ah. .


Post.


168. .


Essence.


0. .


Integral.


72. .


Prestige.


22 points. .


Experience.


22 points. .


The user money.


0. .


Read permissions.


30. .


Sex.


Male. .


Online time.


92 hours. .


The time of registration.


2007-2-13. .


Last logged in.


2009-1-3. .


View detailed information.


TOP. .


TV repair audio repair Beijing television repair maintenance landscape audio.


?? Previous topic | Next topic??. .


【 Domestic television repair bills.


TCL TV service. .


TCL LCD TV repair.


Service instance. .


Konka TV repair.


Konka LCD TV repairs. .


CHANGHONG TV repair.


Changhong TV service instance. .


CHANGHONG LCD TV repair.


Skyworth TV service. .


Skyworth LCD TV repair.


Hisense TV service. .


Hisense LCD TV repair.


Hisense TV service instance. .


Haier TV repair.


Haier LCD TV repairs. .


Xiamen China TV repair.


Xoceco LCD TV repairs. .


TV integrated maintenance.


Classic maintenance experience. .


【 】 Imported TV repair technology.


Sony TV repair. .


Panasonic TV repair.


Toshiba TV repair. .


Hitachi TV repair.


Philips TV repair. .


Samsung TV repair.


LG TV feature pages. .


Other imported TV repair.


】 【Integrated electrical repairs. .


Refrigerator, air conditioning and refrigeration equipment maintenance.


Maintenance of small household electrical appliances feature page. .


Electromagnetism stove maintenance.


Microwave oven repair. .


Washing machine repair.


Game maintenance area. .


Central air conditioning technical exchanges.


Communications equipment maintenance technology. .


Automotive maintenance page.


Satellite TV technology feature pages. .


Power repair technology.


Electronic Technology. .


【 Audio-Visual digital product maintenance technical discussion area ??.


Computer knowledge and network technology. .


Boutique recommended software.


Projector maintenance of the feature pages. .


Audio/visual equipment maintenance.


Maintenance techniques of digital products feature page. .


Enthusiasts nationwide.


【IT】 Product Maintenance Technology Forum. .


Monitor repair.


【Forum】 hard disk maintenance techniques. .


【 Board maintenance technical discussion area ??.


【Printer copier fax machine maintenance, technical discussions】. .


【 】 Maintenance information exchange.


Electrical drawings feature pages. .


Display drawings.


TCL drawings. .


Konka drawings.


Changhong drawings. .


Skyworth drawings.


Hisense drawings. .


Haier drawings.


Xiamen Overseas Chinese drawings. .


Venus SVA drawings.


Made other drawings. .


Sony drawings.


Panasonic drawings. .


Toshiba drawings.


Hitachi drawings. .


LG drawings.


Philips drawings. .


Samsung drawings.


Sanyo drawings. .


Import TV drawings.


IC unit drawings. .


Comprehensive exchange of drawings.


Bus data area. .


IC information page.


Other maintenance information. .


E-books, magazines, video tutorial.


Maintenance Diary. .


【 】 Rest Hall.


Members of the family. .


Electronics production.


Advertising. .


Entertainment page.


【Forum】 affairs. .


The official forum.


Feedback Download Area. .


Control Panel Home.


Edit personal data. .


Credit transactions.


Points record. .


Public user groups.


Medal. .


Access promotion.


Basic profiles. .


Traffic statistics.


Client software. .


Posting quantity of records.


Forum Ranking. .


Theme ranking.


Post Ranking. .


Integral ranking.


Trading Ranking. .


Online time.


Management team. .


Management statistics.


Current time zone GMT +8, the time now is 2009-1-5 13:25 京 ICP 备 06003632 号. .


Clear Cookies-contact us-Beijing home appliance repair-Archiver-TOP-style interface.


The default style. .


Cheers for the Olympic Games.


Blossom. .


Powered by Discuz! 6。.1。.0 ? 2001-2008 Comsenz Inc。.