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We have a TV that does this after we have left it off but plugged in for awhile when we go on a trip. Just unplug the TV, wait a few seconds and plug it back in. If it's like ours, you'll find that resets it.
Thanks for using FixYa. Please check the following— 1. Is Power board output +5V? 2. Is J1 (#19 in the right diagram)connector good? 3. Is DC-DC OK, check the voltage at J1 using a
multimeter. 4. Is U4 (3.3V) working ok, U4 is an IC, you’ll need an
IC tester or an oscilloscope to check this IC. After checking this if it still doesn’t
work then check P3 D-sub Input (on the D-board). See this schematic for
Please do accept the solution if the issue is resolved or else revert for further assistance.