Skyworth LCD TV 32L01HM sound but not timing black screen fault repair case - Appliances

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Skyworth LCD TV 32L01HM repaired over a few days. The customer said: "When you look at it for an hour or so, there will be sound, black screen, and you will come to the image with a hand tap. After a while, it disappears again. Is it that the cable is loose?" I laughed and said: "This is possible. It is caused by the heat of a certain component." Then he was asked to leave a phone call and find out the problem.
After the customer left, I put the TV on the table, plugged in the AV cable, and the picture was normal. Let TV continue to work, I will do other things. After about two hours, no faults have appeared. When my heart was wondering, the TV suddenly blacked out, and there was no backlight. The sound was emitted as usual. I walked over and touched the end of the TV with my hand. But the time is not long, and it is black! Is the heart screaming that the lamp is not in good contact?
After the electric cover is removed, if the contact is poor, first check whether the power board has a phenomenon of desoldering. Magnify the power board with a magnifying glass, and see what is bad! I swept over and swept over, and finally swept to the cable socket with several footprints! This cable is the voltage signal line to the motherboard. Is the problem here? Look again, and find a ceramic capacitor on the main power supply. Solder immediately, try the machine again, and there is no black screen after a few hours.
Call the customer immediately: Red and black brown agreed to repair. The user took the TV home to watch it that day. After watching these days, the customer did not give feedback to the phone, indicating that the machine was indeed repaired. This time it really made the customer guess.