Do the self check.
If you unplugged the set, plug it back, turn it on and allow to fail.
Press both the Menu and Input (input may be labeled device) buttons on the front of the set and Hold both for at least 5 seconds and release both.
Power light will begin to blink a two digit error code like 2 blinks, 2 blinks, pause and repeat it for a total of 5 times.
Let me know what error you find and I tell you the meaning and a possible answer.
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