After repairing a 42-inch Skyworth 42-inch LCD TV 42K08RD, the fault phenomenon is: after turning on the main power switch, the TV green light is on, but there is no light and no sound.
After disassembling, the 5V, 12V, and 24V outputs of the IP board 168P-P42CLM-01 are tested. However, there is no backlight turn-on voltage and upper screen voltage, and it is judged that the motherboard 5800-A8K860-1P20 is not working properly. Checking the DC-DC and LDO on the motherboard found that the output of the LDO U10 was 0.87V, while the input of the U10 was 3.3V.
After the power is turned off, the output of the U10 is tested to a ground resistance of more than 300 ohms. It is not short-circuited. The output capacitance of the U10 is lost. The output of the U10 is connected to the ground with a 16V/220UF; the temperature is 105. The power test U10 has already output 1.20V, and the test machine is OK.
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