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LC-20SH3U TV gradually shut itself off over a few days and finally wont come on at all. The red light comes on but no picture, sound etc.

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The condition of your TV called power supply overcurrent shutdown. The TV is going into a protection mode to prevent further circuit damage. That's why it will not turn on or not powering up. I would concentrate on the power supply section board. Bad regulation of the incoming voltage could caused this issue although,there is a capacitor across the incoming line and nuetral.Maybe its leak or dry up and cause the problems,change it out with one of identical rating .I would probably also check the flyback circuit and flyback transformer although now you are getting into dangerous area,especially if you have no electronic experience background. It could be also be a loose ,crack or cold solder joint,a blown fuse,fusible links or other component .It could be one of several boards.Unfortunately the level of sophistication on these TV make it virtually impossible to diagnose them further without taking them apart and probing around with a multimeter and other tools.This TV is handy enough to take to a repair shop find a good one.You will probably have to pay $75 to $100....

Hope this may help you..

Regards,
VOTIT
DON'T FORGET TO RATE:

Posted on Sep 02, 2008

  • boboy Oct 08, 2013

    checked the jungle ic then locate the zener diode measure the voltage x-ray protect maybe the power is overtage or under voltage follow the voltage source in checked.

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