DIY avest TV repair

Avest 54ТЦ-01 Periodically it does not turn on, when it was brought to me, it turned on for two weeks and worked fine. Spent a lot of time on it. The power supply did not give out any voltages, there was no duty officer, and there was no operating mode. The C514 0.1 uF turned out to be faulty.

AVEST 54ТЦ-01
composition: LC863328A, LA76810, LA7840, LA4285
When watching programs through an RF antenna, there is no color in SECAM, when changing the scene * tears * the image, with a cold start for the first 5-10 minutes there is no horizontal sync. Moreover, according to the client, the malfunction progressed gradually. At first, the color began to blink, then to tear the image, and in the end the line sync disappeared. This immediately led to the idea of ​​a capacitor malfunction. However, after a total check, throw-up, replacement of electrolytes and * clay *, the LA76810 video processor turned out to be faulty

AVEST 72ТЦ-02
Photos of chassis and composition: https://my.housecope.com/wp-content/uploads/ext/2254/section1/topic145215.html
According to the owner: turned off, everything was fine, and after turning on the image flickers.
I turn it on, there is no synchronization, the OSD is normal, but it is clear that the "pillow". While thinking where to start, I saw a discharge from the L403 coil to the radiator. In addition, it was crookedly soldered and barely touched him. Next to it, I found an almost falling out resistor R446. He warmed up well and formed ring cracks around. Eliminated. Everything else turned out to be pretty commonplace. Apparently clicked more than once. The options for correcting DPS and DPC flew off, as well as in the HAFC option it was 03 instead of 00. I set it up, the TV started working.

AVEST 54ТЦ-03
Composition: TCLA19V-03 TDA7057 (ULF)
There was no sound in the malfunction, and sometimes the sound could appear for a short time (“bark”). The culprit was the C-418 47mkF 16V capacitor (at the output of IC401, 9V power supply).

AVEST 54ТЦ-03 Does not turn on. Before that, there was a strong crackling inside. At the autopsy, he found that he was sewing a high-voltage wire. R422 burnt. After testing TDKC JF0501-91826 it turned out to be faulty. This was not on sale. I replaced it with TDKC 154-177B as advised by KRAB, making a re-routing. The TV set started, but there is a narrow strip on the screen. Broken TDA9302. After replacement, everything works fine.

AVEST built on a processor LC863324 and video processor LA76810 one). failure of synchronization replacement of C562 (250X22mkf), 2). gurgles the deputy V553 tries to start.

Avest 54 TC-01 (Diagrams and Service manuals for Avest TVs) Fault: the screen is narrowed, there are vertical stripes (or pillars), a small brightness of the screen glow, suspicion of TDX, but the fault was the line scan transistor 3DD2102 called as serviceable, replaced by 2SD2333.

AVEST 72ТЦ-02-С No sync. Defective capacitor C252 (100n). Connected on 43 pins of the video processor.

Avest 72cm, video processor - TB 1240 No TV signal reception (as if the tuner is faulty). During autotuning, sometimes a signal or noise “skips”. All voltages supplied to the tuner are normal. The suspicion of the tuner was not confirmed. Defect - the video processor and two m / s on the AV input are faulty. Struck by static.

Avest 54ТЦ-04 chassis хххНх, personnel D9302, (TDA9302H, LA78045) Fault: there is no frame scan. Choke L401 22hH is open or burnt. (stand-by malfunction, 4 devices per week.)

Avest 64ТЦ-04 chassis С11Ч2 Fault: the TV sets the programs in a circle. The control processor TDA9384 is faulty, (frequent malfunction) 5 leg of the processor rings 10-150 Ohm. The control buttons are metallized. Static however. TV revision required. Check if the control board is properly connected to the TV chassis. The white wire from the control board must be connected to the common point of the circuit, and the blue wire - to the control input of the microprocessor to “ground” the conductive spraying on the buttons of the control board.

Avest 64ТЦ-03 Fault: periodically goes to the duty room, you turn it on from the remote control or panel again, it works from 1 minute to an hour. I replaced the Q003 C1815 transistor, through which sync pulses (TVSinc) come to the processor.

AVEST 54ТЦ04 Fault: a few minutes after turning on the device, when switching from program to program, the screen does not go out, but remains gray with OX lines, and the horizontal size jerks for a moment, and can turn off into standby mode at that moment. After another couple of minutes, it spontaneously goes into “standby mode” in the middle of the program, although no one touches it anymore. Picture and sound are normal. Easily turns back on, then turns off again. The reason for this strange behavior was the mains supply electrolyte - С891 220.0x160V 105C.

AVEST model TRB-2158 Fault: entered for repair after being flooded with water. The owner washed with soap and then dried. After switching on, the line scan transistor D1555 burned out. Then TDKS BSC 25-4801. Also, as it turned out later, the AP551 trimmer in the power supply unit was upset, which caused the 2SD1545 power transistor to burn out. Instead, a domestic KT840 was installed on a radiator of about 50 cm square. The problem arose with TDKS. Native was nowhere to be found. BSC24-1101Y was supplied. In it, attention, a general conclusion. Pins 5, 6 are not needed. pins 1, 3, 8, 9, 7 are similar to pins 2, 3, 7, 5, 8 of the BSC25-4801 transformer, respectively. Well, high-voltage HU, FOKUS, SCREEN are the same. During installation it is necessary to cut the corresponding tracks and put jumpers on the required terminals of the transformer. The TV works great. And in the store they convinced me that this transformer would not work, I needed a dear one. The devil is not so terrible as his Malevich.

AVEST 64ТЦ-02-С and the like. Fault: there is no frame scan, there is a horizontal bar on the screen. Do not rush to change the microcircuit, a characteristic defect - an annular crack in the soldering of the booster diode that supplies power to the output stage of the microcircuit - is already a few cases with the relative novelty of the brand.

Avest 54ТЦ-03С. Fault: the image below is compressed by about 10 cm. The defect disappears after a few hours of operation. The fault is the C843 470.0x16V in the + 10V power circuit.

AVEST 54ТЦ-03 Fault: staffing is narrowed, from the bottom of the screen, the twist with heating increases slightly. The capacity of C843 (470x16v) in B.P. is faulty.

Avest TCS-2101 Fault: stripes on the screen, distortion, loss of synchronization. The reason is the capacity of C562 10mkfh315V, a complete break.

Avest 72ТЦ03 Fault: tries to start and immediately turns off. We tried to turn off the personnel, the TV turned on, a narrow band is understandable. Replacing the staffing of the same defect. And the reason turned out to be in the TDA16846-2P power supply microcircuit, after its replacement, the TV started working.

AVEST TCS-1401... Fault: PSU does not start. Defective transistor V511 2SA1015, leakage KE.

AVEST 54ТЦ-03 type 47E248E2. WARNING: come with a diagnosis clicked and extinguished. Defective PI. We are in no hurry to repair. We check the diode on the secondary 115V. If there is a short circuit, then the repair can be completed at this. Killed by FBT BSC2-010- 100%, CPU -90%. Anyone interested can launch an IP. After switching on, the FBT discharge to the nearby radiator of the power supply and the result is a again killed source. Statistics: Received for repair about fifty 47E248E2. None with a working FBT.

AVEST 72TC-02C19H3 lost sound. HISENSE-EXPORT1 5H31-3PB3 video processor TB1238N electronic volume control TA8776N. To enter the service menu, press MENU on the standard remote control, enter the section where the password is entered, press MUTE and enter the code 1238, the letter D appears on the screen in item MOD1, put 17 and the sound turns on

1400.) AVEST is built on the LC863324 processor and the LA76810 video processor 1). failure of synchronization replacement of C562 (250X22mkf), 2). gurgles the deputy V553 tries to start.

1422.) Avest 54 Tts-01 (Manufacturer's address Fault: the screen is narrowed, there are vertical stripes (or pillars), a small brightness of the screen glow, suspicion of TDX but the fault was the 3DD2102 line scan transistor called as good, replaced by 2SD2333.

1655.) AVEST 72ТЦ-02-С. No sync. Defective capacitor C252 (100n). Connected on 43 pins of the video processor.

1954.) Avest 72cm, video processor - TB 1240. No TV signal reception (as if the tuner is faulty). During autotuning, sometimes a signal or noise “skips”. All voltages supplied to the tuner are normal. The suspicion of the tuner was not confirmed. Defect - the video processor and two m / s on the AV input are faulty. Struck by static.

2035.) Avest 54ТЦ-04 chassis хххНх, personnel D9302, (TDA9302H, LA78045). Fault: there is no frame scan. Choke L401 22µH interrupted or burnt out. (stand-by malfunction, 4 devices per week.)

2036.) Avest 64ТЦ-04 chassis С11Ч2. Fault: the TV sets the programs in a circle.The control processor TDA9384 is faulty, (frequent malfunction) 5 leg of the processor rings 10-150 Ohm. The control buttons are metallized. Static however. TV revision required. Check if the control board is properly connected to the TV chassis. The white wire from the control board must be connected to the common point of the circuit, and the blue wire - to the control input of the microprocessor to “ground” the conductive spraying on the buttons of the control board.

2321.) Avest 64ТЦ-03 Fault: periodically goes to the duty room, you turn it on from the remote control or panel again works from 1 minute to an hour. I replaced the Q003 C1815 transistor, through which sync pulses (TVSinc) come to the processor.

2616.) AVEST 54ТЦ04 Fault: a few minutes after turning on the device, when switching from program to program, the screen does not go out, but remains gray with OX lines, and the horizontal size jerks for a moment, and can turn off into standby mode at that moment. After another couple of minutes, it spontaneously goes into “standby mode” in the middle of the program, although no one touches it anymore. Picture and sound are normal. Easily turns back on, then turns off again. The reason for this strange behavior was the mains supply electrolyte - С891 220.0x160V 105C.

2630.) AVEST model TRB-2158. Fault: entered for repair after being flooded with water. The owner washed with soap and then dried. After switching on, the line scan transistor D1555 burned out. Then TDKS BSC 25-4801. Also, as it turned out later, the AP551 trimmer in the power supply unit was upset, which caused the 2SD1545 power transistor to burn out. Instead, a domestic KT840 was installed on a radiator of about 50 cm square. The problem arose with TDKS. Native was nowhere to be found. BSC24-1101Y was supplied. In it, attention, a general conclusion. Pins 5, 6 are not needed. pins 1, 3, 8, 9, 7 are similar to pins 2, 3, 7, 5, 8 of the BSC25-4801 transformer, respectively. Well, high-voltage HU, FOKUS, SCREEN are the same. During installation it is necessary to cut the corresponding tracks and put jumpers on the required terminals of the transformer. The TV works great. And in the store they convinced me that this transformer would not work, I needed a dear one. The devil is not so terrible as his Malevich.

2659.) AVEST 64ТЦ-02-С and the like. Fault: there is no frame scan, there is a horizontal bar on the screen. Do not rush to change the microcircuit, a characteristic defect - an annular crack in the soldering of the booster diode that supplies power to the output stage of the microcircuit - is already a few cases with the relative novelty of the brand.

2695.) Avest 54ТЦ-03С. Fault: the image below is compressed by about 10 cm. The defect disappears after a few hours of operation. The fault is the C843 470.0x16V in the + 10V power circuit.

2787.) AVEST 54TTS-03 Fault: staffing is narrowed, from the bottom of the screen, the twist with heating increases slightly. The capacity of C843 (470x16v) in B.P. is faulty.

2794.) Avest TCS-2101 Malfunction: stripes on the screen, distortion, loss of synchronization. The reason is the capacity of C562 10mkfh315V, a complete break.

2813.) Avest 72ТЦ03 Fault: it tries to start and immediately turns off. We tried to turn off the personnel, the TV turned on, a narrow band is understandable. Replacing the staffing of the same defect. And the reason turned out to be in the TDA16846-2P power supply microcircuit, after its replacement, the TV started working.

2816.) AVEST TCS-1401. Fault: PSU does not start. Defective transistor V511 2SA1015, leakage KE.

2893.) AVEST 54ТЦ-03, type 47Е248Е2. WARNING: come with a diagnosis clicked and extinguished. Defective PI. We are in no hurry to repair. We check the diode on the secondary 115V. If there is a short circuit, then the repair can be completed at this. Killed by FBT BSC2-010- 100%, CPU -90%. Anyone interested can launch an IP. After switching on, the FBT discharge to the nearby radiator of the power supply and the result is a again killed source. Statistics: Received for repair about fifty 47E248E2. None with a working FBT.

2930.) AVEST 72TC-02C19H3 Fault: sound disappeared. HISENSE-EXPORT1 5H31-3PB3 video processor TB1238N electronic volume control TA8776N. To enter the service menu, press MENU on the standard remote control, enter the section where the password is entered, press MUTE and enter the code 1238, the letter D appears on the screen in item MOD1, put 17 and the sound turns on

3047.) AVEST VR54TS-2145. Fault: horizontal stripe and 5cm. bloat is barely visible. There is no scheme. Replaced TDA8174W, capacitors, checked resistors and diodes. For the tenth time of the test, the diode - 1N4007 broke off between the legs of the microcircuit. Replaced - it gets very hot. I had to look for a circuit using this microcircuit. Found in GRUNDIG, between 2 and 10 feet is 1N4936.Replaced - everything is fine.

3070.) AVEST TRB-2158 (LC863320A) Fault: spontaneous switching on and off. The reason is the leakage of VD703 4.2V along the pin circuit. 7MP RESET.

3071.) AVEST 64TTS-02-S19N3 MP 5N32-3RV3 Malfunction: the raster is compressed vertically. Cause - leakage С436 8.2 nF

3072.) AVEST 72ТЦ-04-PS91CH2 Fault: line scan disappears. Reason - Weak contact in the OS connector.

3073.) AVEST 37ТЦ-04-С75Н3 Fault: there is no video and sound when receiving TV channels. The reason is an open circuit of L351 6.8 mH in the inverter processing circuit.

3074.) AVEST 64TTS-03PS286T3 Fault: line synchronization failure. The image is folded. The reason is an open circuit in the BSR R401 220 kOhm.

3075.) 64ТЦ-02PS-168Т3 Fault: no video and sound. The reason is that the voltage supplying the processor was 10V instead of 5V. Fault Q061 2SA1015, Q062 C33740, IC002 24C08.

3076.) 37ТЦ-03-С19Т2 Fault: does not turn on in the operating mode. Fault - resistor RV801 1kOhm.

3077.) 54ТЦ-01-022 Fault: does not turn on. The reason is an open circuit of R555 47kOhm.

3078.) 54ТЦ-04-С19Н3 Fault: no video and sound. The reason is a memory failure. Firmware for N701 24C08A programmer.

3079.) 54ТЦ-01-022 Malfunction: after repair of the power supply unit (overvoltage consequences), the TV did not start up. I noticed there are no packages on quartz Z701 4.43MHZ. The reason - next to the MP LC863328A C704 increased the capacity from 40 to 52nF!

3126.) AVEST 37ТЦ-03. Malfunction - does not turn on. The reason is an open circuit in the R801 220 kΩ power supply unit.

3127.) AVEST 54ТЦ-03-С18Н2. Fault - no video on HF and LF there is a blue background, menu and sound. After heating the MP 8821CPNG4UD4 with a hair dryer, a color image appears without a brightness component. The reason is MP 8821СPNG4UD4.

3297.) Avest 54ТЦ03 Fault: no image. If a malfunction is detected, a failure of the STV9302A vertical sweep microcircuit and a breaking resistor R550 - 1 Ohm / 1 W. The output voltages from the power supply are overestimated by about two times. When checking the elements of the power supply, a punctured Zener diode VD551 - 6V2 was found. Replacing VD551 and VD515 - PC817 optocouplers gave nothing. A detailed check revealed a leak between the base-emitter junction of the transistor V551 - C1815 in the optocoupler control circuit. For greater confidence, the transistor for amplifying the signal of the optocouplers V551 - A1015, and V512 - C3807, as well as the capacitor in the chain of the line transistor C422 - 22 μF / 250V (dried up to 15 μF) were also replaced. As a result, the output voltages returned to normal, but the repairs did not end there. When installing a new m / ch personnel and starting the TV, it turned out that the reverse lines appeared on the top of the screen. The reason for this was the capacitor in the strapping of the personnel C449 - 100 microfarads / 35V (dried up to 2.5 microfarads). Thus, repeated failure of the m / c personnel was prevented in the near future. As a result of the work done, the TV was fully operational.

3298.) Avest 54ТЦ04 Fault: the image is minimized in a horizontal strip, there is sound, the command processor is working out. When a malfunction is detected, a choke on the power supply of the personnel microcircuit was found in the open circuit (far from the first case). A more detailed examination revealed numerous imperfections in the frame scan circuit and the kinescope board. The power supply voltage is normal. Replacing the throttle and eliminating non-connections completely restored the TV's operation.

3299.) Avest 54ТЦ03 Malfunction: does not show signs of life. When measuring, the secondary voltages are underestimated (instead of 115V - 12V). The reason for this was the leakage of the E-K junction of the Q802 (A1015) transistor. Replacing the transistor corrected the malfunction.

3426.) Avest 54 TC-01 Fault: it does not turn on periodically, when it was brought to me, it turned on for two weeks and worked fine. Spent a lot of time on it. The power supply did not give out any voltages, there was no duty officer, and there was no operating mode. The C514 0.1 uF turned out to be faulty.

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- AVEST is built on the LC863324 processor and the LA76810 video processor 1). breakdown
synchronization replacement for C562 (250X22mkf), 2). gurgles the deputy V553 tries to start.

- Avest 54 Tts-01 (Manufacturer's address Fault: narrowed screen
there are vertical stripes (or pillars) a slight brightness of the screen glow,
suspicion of tdks but the fault was the line scan transistor 3DD2102 called
as serviceable, replaced by 2SD2333.

- AVEST 72ТЦ-02-С. No sync. Defective capacitor C252 (100n). Connected
43 legs of the video processor.

- Avest 72cm, video processor - TB 1240. No TV signal reception (as if faulty
tuner). During autotuning, sometimes a signal or noise “skips”. All the tensions
supplied to the tuner are normal. The suspicion of the tuner was not confirmed. Defect - faulty
video processor and two m / s via AV input. Struck by static.

- Avest 54ТЦ-04 chassis хххНх, personnel D9302, (TDA9302H, LA78045). Fault: no
personnel sweep. Choke L401 22µH interrupted or burnt out. (duty failure, for
week 4 devices.)

- Avest 64ТЦ-04 chassis С11Ч2. Fault: the TV sets the programs in a circle.
Defective control processor TDA9384, (frequent failure) 5 leg of the processor
ringing 10-150 ohms. The control buttons are metallized. Static however. Required
revision of TV. Check if the control board is properly connected to the TV chassis.
The white wire from the control board should be connected to the common point of the circuit, and the blue wire to
to the control input of the microprocessor to “ground” the conductive spraying on
control board buttons.

- Avest 64ТЦ-03 Malfunction: periodically goes to the duty room, you turn it on from the remote control
or the panel runs again from 1 minute to an hour. Replaced transistor Q003 C1815, through
which sync pulses (TVSinc) come to the processor.

- AVEST 54TTS04 Malfunction: a few minutes after turning on the device when
the transition from program to program, the screen does not go out, but remains gray with OX lines,
and the horizontal size jerks for a moment, and maybe at this moment
disconnect in standby mode. After another couple of minutes, it spontaneously goes into
"Standby mode" in the middle of the program, although no one touches it anymore. Picture and sound in
the norm. Easily turns back on, then turns off again. The reason is so strange
behavior was the electrolyte for the mains supply - C891 220.0x160V 105C.

- AVEST model TRB-2158. Fault: entered for repair after it was
flooded with water. The owner washed with soap and then dried. After switching on, the transistor burned out
line scan D1555. Then TDKS BSC 25-4801, as it turned out later
the AP551 trimmer in the power supply is upset, which caused the 2SD1545 power transistor to burn out.
Instead, a domestic KT840 was installed on a radiator of about 50 cm square. Problem
originated with TDKS. Native was nowhere to be found. BSC24-1101Y was supplied. In it, attention,
general conclusion. Pins 5, 6 are not needed. pins 1, 3, 8, 9, 7 are similar to pins 2, 3, 7, 5,
8.Transformer BSC25-4801 respectively. Well, high-voltage HU, FOKUS, SCREEN,
the same. During installation it is necessary to cut the corresponding tracks and put the jumpers on
the required output of the transformer. The TV works great. And in the store me
convinced that this transformer will not work, you need a dear one. The devil is not so scary as him
Malevich.

- AVEST 64ТЦ-02-С and the like. Fault: no frame scan, on the screen
horizontal stripe. Do not rush to change the microcircuit, a characteristic defect is an annular
a crack in the soldering of the booster diode supplying power to the output stage of the microcircuit -
already several cases with the relative novelty of the brand.

- Avest 54ТЦ-03С. Fault: the image below is compressed by about 10 cm. Across
the defect disappears after a few hours of operation. The fault is the C843 470.0x16V in the + 10V power circuit.

- AVEST 54ТЦ-03 Malfunction: staffing is narrowed, from the bottom of the screen a twist with heating
increases slightly. The capacity of C843 (470x16v) in B.P. is faulty.

- Avest TCS-2101 Malfunction: stripes on the screen, distortion, loss of synchronization.
The reason is the capacity of C562 10mkfh315V, a complete break.

- Avest 72ТЦ03 Fault: tries to start and immediately turns off.
We tried to turn off the personnel, the TV turned on, a narrow band is understandable.
Replacing the staffing of the same defect. And the reason turned out to be in the TDA16846 power supply chip
-2P, after replacing it, the TV worked.

- AVEST TCS-1401. Fault: PSU does not start. Defective transistor
V511 2SA1015, K-E leak.

- AVEST 54ТЦ-03, type 47Е248Е2. WARNING: come with a diagnosis clicked
and went out. Defective PI. We are in no hurry to repair. We check the diode on the secondary 115V. If
KZ, then the repair can be completed on this. Killed by FBT BSC2-010- 100%, CPU -90%. To whom
I wonder if I can start the SP. After switching on, the FBT discharge to the nearby PS radiator and
the result is a killed source again.Statistics: Received for repair about fifty 47E248E2. No
one with a working FBT.

- AVEST 72TC-02C19H3 Malfunction: sound disappeared. HISENSE-EXPORT1 processor
5H31-3PB3 video TB1238N electronic volume control TA8776N. To enter
the service menu must be pressed on the standard remote control MENU to enter the section where to start
password press MUTE and enter the code 1238 the letter D will appear on the screen in the MOD1 item put
17 and the sound turn on

- AVEST VR54TS-2145. Fault: horizontal stripe and 5cm. barely visible
bloat. There is no scheme. Replaced TDA8174W, capacitors, checked resistors and diodes. On the
the tenth time of the check, the diode - 1N4007 between the legs of the microcircuit broke off. Replaced- strongly
heats up. I had to look for a circuit using this microcircuit. Found in GRUNDIG, between 2 and 10 feet
costs 1N4936. Replaced - everything is fine.

- AVEST TRB-2158 (LC863320A) Fault: spontaneous activation and
shutdown. The reason is the leakage of VD703 4.2V along the pin circuit. 7MP RESET.

- AVEST 64TTS-02-S19N3 MP 5N32-3RV3 Malfunction: the raster is compressed vertically.
Cause - leakage С436 8.2 nF

- AVEST 72ТЦ-04-ПС91Ч2 Malfunction: line scan disappears. Reason -
Weak contact in the OS connector.

- AVEST 37ТЦ-04-С75Н3 Malfunction: there is no video and sound when receiving TV channels.
The reason is an open circuit of L351 6.8 mH in the inverter processing circuit.

- AVEST 64TTS-03PS286T3 Fault: line synchronization failure. Image
folds up. The reason is an open circuit in the BSR R401 220 kOhm.

- 64ТЦ-02PS-168Т3 Malfunction: no video and sound. Cause - power supply voltage
processor instead of 5V was 10V. Fault Q061 2SA1015, Q062 C33740, IC002 24C08.

- 37ТЦ-03-С19Т2 Malfunction: does not turn on in operating mode. Malfunction -
resistor RV801 1kOhm.

- 54ТЦ-01-022 Malfunction: does not turn on. The reason is an open circuit of R555 47kOhm.

- 54ТЦ-04-С19Н3 Malfunction: no video and sound. The reason is a memory failure. Firmware on
programmer N701 24C08A.

- 54ТЦ-01-022 Malfunction: after repair of the power supply unit (consequences of overvoltage), the TV does not
started up in operating mode. I noticed there are no packages on quartz Z701 4.43MHZ. The reason is near
with MP LC863328A C704 increased the capacity from 40 to 52nF!

- AVEST 37ТЦ-03. Malfunction - does not turn on. The reason is an open circuit in the R801 220 kΩ power supply unit.

- AVEST 54ТЦ-03-С18Н2. Malfunction - there is no video on HF and LF there is a blue background, a menu and
sound. After warming up the MP 8821CPNG4UD4 hair dryer, a color image appears without
luminance component. The reason is MP 8821СPNG4UD4.

- Avest 54ТЦ03 Malfunction: no picture. When a malfunction is detected
a failure of the STV9302A vertical sweep microcircuit and a bursting resistor was detected
R550 - 1 Ohm / 1 W. Output voltages from the power supply unit are overestimated by about two times. At
Checking the elements of the power supply unit detected a punctured Zener diode VD551 - 6V2. Replacement
VD551 and optocouplers VD515 - PC817 gave nothing. Detailed inspection found leak
between the base-emitter transition of the transistor V551 - C1815 in the optocoupler control circuit. For
more confidence, the optocoupler signal amplification transistor V551 was also replaced -
A1015, and V512 - C3807, as well as a capacitor in the circuit of the line transistor C422 - 22 μF /
250V (dried up to 15 microfarads). As a result, the output voltages returned to normal, but at this
renovation is not over. When installing a new m / ch personnel and starting the TV, it turned out that the upper
retrace lines appeared on the screen. The reason for this was the capacitor in the piping.
personnel S449 - 100 microfarads / 35V (dried up to 2.5 microfarads). Thus was prevented
repeated failure m / ch personnel in the near future. As a result of the accomplished
TV operation was fully restored.

- Avest 54ТЦ04 Malfunction: the image is minimized in a horizontal strip, sound
is, the command processor works. When a malfunction is detected, it is found in a break
choke for power supply of the personnel microcircuit (far from the first case). In more detail
Inspection revealed numerous imperfections in the frame scan circuit and the kinescope board.
The power supply voltage is normal. Replacement of the throttle and elimination of non-conduits completely restored
TV work.

- Avest 54ТЦ03 Malfunction: does not show signs of life. When measured, secondary
voltage is too low (instead of 115V - 12V). The reason for this was the leakage of the E-K transition
transistor Q802 (A1015). Replacing the transistor corrected the malfunction.

- Avest 54 TC-01 Malfunction: it does not turn on periodically when it was brought to me
it turned on for two weeks and worked fine. Spent a lot of time on it. Block
the power supply did not give out any voltages, there was no duty officer, and there was no operating mode.
C514 0.1 uF turned out to be faulty

It is impossible to imagine a modern apartment or house without video and audio equipment. This equipment is used every day and therefore breaks down more often than others. There are several ways to repair TVs: send the technician to a service center, call a qualified technician at home, or make repairs with your own hands.

Before you start repairing a TV, you first need to make sure what the problem is. This will also help if you do the repair yourself, and then when the master comes, you will be able to explain the situation to him.

There are several types of malfunctions that can most often be found when a TV breaks down.

1. The technique does not turn off. In independence, a CRT TV or a modern LCD model has broken down, this malfunction is associated with a blown fuse. Only different models have distinctive details from each other. You should also pay attention to the diode bridge - perhaps it was he who burned out.
2. In both domestic and imported models, the potential can often go astray, for the function of which the posistor is responsible.
3. If the plasma TV monitor is broken, then the problem, most often, is interference or drops, light or dark stripes may appear, color changes while watching a program or movie.
4. The problem may be a broken cord or a faulty outlet.

If we take into account all the troubles listed above, it is worth saying that the most difficult breakdown is considered to be a screen malfunction. For example, light reflections appear on your monitor after the liquid hits the matrix or the TV is hit, then it is better to carry it to the teleservice. Here it will certainly be repaired, and if the warranty period has not expired, then it will be free of charge or at a reduced price.

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You can try to fix some malfunctions of TVs yourself. And it doesn't matter here - these are LCD models, LCD or LED, it is not necessary to call the wizard if you are confident in your abilities. But caution never hurts, because such TV models are not cheap, and without having any repair experience or knowledge in this area, you can only harm and aggravate the breakdown.

Before you start repairing LED or LCD TVs, you must carefully read the instructions, and also study the principle of operation of your model. Anyone, even one far from this field, will understand that the repair of TVs such as LCD or LED will differ from CRT models. In the latter case, you are guaranteed not to run into a faulty PTC thermistor. The main thing here is to determine the problem, why does the backlight not work?

If you are repairing LCD, LED models, then the only difference here will be what kind of backlight is used. If it is an LCD TV, then the backlighting is produced using fluorescent or fluorescent lamps. For TVs, LED backlighting is produced using LEDs. At this point, the differences between LCD models usually end.

The breakdown can only consist in the fact that there is no power, in order to check this on an LCD TV, you can do the following with your own hands:

• open the back cover of the model;
• remove the wires connected to the matrix;
• connect the working lamp to the contacts;
• there are also LCD models in which more than one light source is provided. In this case, all sources must be tested. Just dismantle the matrix and plug your TV into the network - you can see which LED is the problem.

When a broken lamp in an LED or LCD TV is identified, it must be replaced. This stage requires maximum care from the master, as well as the manifestation of special attention. In some cases, the lamp is removed without removing the matrix, you just need to move the protective elements with a rubber gasket and pull out the lamp with a soldering iron. Similarly, it is necessary to mount a working light bulb. Now we can congratulate you - you did the repair of the LCD TV with your own hands! Just pay attention to one important nuance - the new light bulb must fully meet the parameters and dimensions of the broken one!

To repair TVs yourself, look carefully at the matrix! If there are "unhealthy" streaks here, then the breakage is in the matrix. Have a new part? Then everything is simple! You change it and turn on the TV, if it works, then you have accurately identified the breakdown.

If the reason for the breakdown of LCD TVs is the screen, then it is best to purchase new models of LCD or LED equipment. It is not recommended to change the screen of LCD and LED models, as it is impractical! This also applies to the LCD matrix.

What could be the problem with a malfunctioning plasma TV? If it is necessary to repair plasma TVs, then proceed in the same way as described above. Just adapt it to your specific case. This description can be applied to any model of plasma TV, just stock up on the necessary tools in advance.

Although today most users prefer to use plasma, many still watch programs on more outdated CRT models. Let's find out how to repair a breakdown in such TVs. Below is a step-by-step instruction that will help you repair your electron beam product with your own hands.

• If you do not turn on such a device, check first of all the fuses. In these TVs, the back is made up of panels. Therefore, it is necessary to unscrew that part of the panels. Under such panels you will find a board and the power terminals must be connected to the fuse. They are connected to a conventional incandescent lamp, or rather to its base, after which the TV must be connected to the network. In the event that your equipment is in good working order, the lamp will go out after switching on, otherwise, when the fuse has blown, it will either not work at all, or it will constantly burn.
• The diode bridge may also break. It should only be borne in mind that it is necessary to regulate and repair it only after making a dial. In this case, not only a multimeter is used, but also a product passport, which indicates the main parameters of this model.
• The most difficult breakdown in a TV with a kinescope is a posistor. To check with your own hands, you must first turn off the power circuit, and then turn it on. In this case, the lamp must be monitored. If the work lamp goes out, then it can be said that the posistor is faulty. To make repairs, it is necessary to adjust the resistance of the network and only ventures to change this part.

But not only the matter may be in the posistor, transistors and capacitors burn out in CRT models. The diagnosis of this breakdown can also be made visually. If the condensate is blackened or cracked, then we replace it with a serviceable analogue. Now you know why the TV does not work and how to fix it yourself.

It's a shame to throw out a TV that costs 50,000 rubles and more, on the contrary, a cheap LCD panel is sometimes easier to buy than to replace the matrix. This takes on significance in private companies, the staffing table contains a master's cell. It is not surprising that there is a keen interest in repairing TVs with your own hands, the breakdown may be insignificant, the gain is obvious.How not to be electrocuted, not to break the device? We plan to discuss with today's review, we will list the main types of faults.

The percentage of models with a cathode-ray tube is large. It is logical to start with them to consider how to repair a TV, because switching power supplies are considered an integral part of any equipment. Liquid crystals, OLED (organic diodes), plasma. Scanning chips use similar principles. The way of building the image is different, but the element base is similar. Consequently, do-it-yourself TV repair moves along the beaten path.

The equipment contains fuses. Let's open a secret: if a force majeure situation (lightning strike, power surge, equipment drop) happens, the protection should break. Almost the end catches up with the microcircuits. Start with the fuse. Of course, if the equipment is devoid of signs of life. In normal mode, the current through the fuse is zero, the repair specialists came up with the fact, put it into service. The burned-out part is removed, a 100-watt light bulb is connected to the terminals. The resistance is relatively high, it will serve as a good current limiter, the electrical circuit will slow down further to burn out.

Note. According to Ohm's law, the power released by a section of a circuit is proportional to the current. By limiting the value, we will avoid burnout of radio components. Actually, this is done by supplementing the circuit with limiting resistors. The light bulb serves the purpose of indication, makes it clear if an electric current is passing. The spiral is heating up, we see the light.

In normal mode, the light will blink, then go out after turning on the TV. Moreover, the device with such an additive works slightly incorrectly. There are two parts that often burn on CRT TVs:

1. The diode bridge rectifies the current. With a sharp increase in consumption, one branch burns out. Usually two diodes fail. You can determine the suitable ones by dialing. The diode current flows in one direction, in the other the valves are locked. The circuit triangle indicates where the current is going. According to the concepts of circuitry, the current always flows from plus to minus. Accordingly, place the electrodes starting the dial tone.
2. The second curious detail is a posistor operating on an inductive loop, the task of which is to remove the potential from a cathode-ray tube. Otherwise, a characteristic rainbow appears on the screen due to the violation of the movement of electrons. A thermistor or a loop may burn out. It is easy to check the circuit. You will need to turn off, then turn on the power. If the lamp that used to be on is now out, the problem is in the potential removal circuit. You can test the device, for a while it will be able to work normally without a loop.

How to understand whether the posistor is out of order or the loop is burnt out? First, measure the resistance. The posistor has four inputs. Two form a heating circuit, two - remove the potential. The resistance between the first pair will be 300 - 600 ohms, between the second - units of ohms. If you turn off the outputs going to the CRT demagnetization loop, we will exclude the section from work. The verification technique is simple. If the lamp is on with the loop, but not without, then you will have to look for a new lace. Visually - a thick wire that surrounds the cathode ray tube around the perimeter. To check the posistor with 100% accuracy, take the trouble to evaporate. After turning on the power, observe the action of the light bulb.

For reference. You cannot keep the equipment turned on for a long time with a light bulb that replaced the fuse. The device is defective, there is a large current in it. It is enough to turn on for a second to understand whether the light is on or not. Then unplug the TV plug from the outlet. It will allow you to protect the serviceable elements of the chain from the unusual load.

What else will burn? In the power supply at the input there is a large capacitor, next to it is a power transistor. Both parts are ringing. The transistor breaks through the source-drain transition, although other options are possible.If it is noticed that half of the diode bridge has burned out, it speaks eloquently: the fuse has failed. The type of breakdown of the TV indicates: there is still a malfunction inside. But it has already led to the failure of one branch of the diode bridge. Carry out the diagnostics until the lamp refuses to light up at all. The key sign of a properly working TV is a characteristic hum, which indicates that the line scan has turned on.

Forgot to give general instructions on how to repair your TV. The main board is dismantled for convenience, leaving a chance to get an electric shock even from the switched off device. It seems that no one has died yet, they got burns. You will need to discharge the cathode-ray tube electrode. Located under the rubber gasket. Without touching the metal parts with your hands, pry the rubber with a screwdriver, swinging from side to side, remove the electrode. Discharge the rod onto the body. If you see a ground loop nearby, it is better to go to it. It is clear that for a successful procedure, you need to have a European socket with correctly connected terminals on hand.

Clicks will be heard during discharge. Continue to touch the contact while the phenomenon is observed. Any modern TV set has electronics assembled by one board, which controls the operation. Many radioelements are visually assessed for their integrity. Defective capacitors swell, resistors (active elements) turn black. Darkened resistance sometimes stays good. The defect clearly indicates: the radio element closes the circuit of the broken element.

LCD TV repair is similar to the case of CRT models. The posistor is, of course, absent. It's easy to understand the cause of the backlight breakdown. LCD TVs use two types:

• discharge gas lamps;
• organic or LEDs.

Gas lamps don't look like cousins ​​hanging from ceilings. Rather white straws. To check the power, remove the back panel to see the wires going into the matrix. Carefully disconnect from the connector, taking a working lamp, check the functionality. It happens that a number of discharge light sources are occupied by the illumination. Take the trouble to remove the matrix, turn on the TV, see which lamp does not work, replace it.

The installation scheme of the illuminators is different. In some TVs, you just need to pull out the lamp from the end without disassembling the matrix. The wires come in from both sides, each covered with a rubber gasket. The protective elements should be pushed aside, the lamp should be evaporated. Installing a new one takes place in the reverse order. Try to choose one that is equivalent in size to the replaceable one. The location of the lamp is lateral, less often the top. It happens that there are two or more illuminators. If a vertical or horizontal stripe appears on the matrix, the scanning electrode most likely burned out. Try to turn on the device with a different, known good matrix to check the assumption.