A Skyworth 32L01HM LCD TV, three no lights are not lit. Disassemble the machine to check the insurance, the 380V voltage of the large filter capacitor is normal, the power board only has one standby power supply voltage of 3.5V (normal should be 5V), and the other output voltages are all 0. Press the channel plus or minus button and remote control The standby button has no response. Since the main power supply is controlled by the standby power supply and the computer board, first check the standby auxiliary power supply, and disassemble the aluminum heat sink on the power supply board. It is obvious that there is an electrolytic capacitor pregnant. Check the circuit for the power supply 5V output filter capacitor. The nominal value is 10V680 micro. The method, after replacing with a 35V1000 micro-capacitor, the voltage is restored to normal 5V, and the standby red indicator light is on. After the channel key is pressed, the TV normally starts to appear LOGO.
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Connected to the DVD signal to turn on the normal image, but found that the sound is very loud, carefully heard that it is transmitted from one side of the speaker, the other is normal, and there is still noise in the channel after the audio input line is unplugged (only inserted In the state of the video line, the TDA8932BT is powered normally, and the voltages of the other feet are basically normal. The hand touched the power amplifier block was obviously hot, and it was suspected that it was damaged. After the multi-party search data, it is easy to find that the sound-adjusting circuit of the machine is easy to break (composed of the U45 model L358 and the surrounding RC components), the replacement of the L385 block is invalid, and a patch is found when checking the surrounding RC components. Resistor open circuit, label R455, the resistance should be 33K, find two ordinary resistors in series and replace the fault completely.
The resistors R455 and R459 are open circuit breakers for this machine.
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