Chosen Solution
Mine has done this several times, only way I can get it to come back is to leave it UNPLUGGED for 72 hours and then it seems to work. The above button sequence did not work. Seems I read somewhere about a resistor / capacitor or something needs to cool down? Power supply is good. I have tried holding the power button for 60+ seconds and holding power and channel selector, nothing works except (in the past) leaving unplugged for three days…. Any advice?
@traditions1_ Panasonic TV’s have a reputation for power boards going bad. Plasma TV’s made in / around 2012 have some faulty components that go bad. Replacing the power supply unit usually fixes the problem. I know you stated that the power supply is good, but you did not tell us if and how you tested it and what you found during the time your TV did not start. Update (03/12/2017) to remove the power supply follow these instructions
