Hi there, My TV screen started flickering and screen went light gray. It has horizontal lines on it. The picture and sound is still showing. I have unplugged and inputs to the TV and power. problem still accurs with nothing plugged in except power. Is this caused by the TCON board?
SOURCE: lg lcd can a bad tcon board kill all power
Yes , it can be a short on the board that will ask the SMPS unit to protect the power so as to switch off. So even with a multi-meter check you will be able to trace the short on the board, the drivers or any capacitor that is cutting off the power which must solve the issue.
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