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1) Does the set power up on its own as soon as it's plugged in? Or only after the power button is pressed?
2) When did this issue occur- were there storms, or power outages, etc.?
Thanks for the reply. These symptoms indicate a faulty Mainboard in the set- since this provide the turn on command to the power board, and also produces the turn on chime. Are you looking to replace this part yourself?