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Ok, let's see if we can get a diagnostic code out of it. Try this... turn the TV on and wait for it to turn itself off. Now on the TV's front panel (not the remote) press and hold the ACTIVITY and CH DOWN (-) buttons simultaneously, and hold for at least 5 seconds. The front panel LED should flash, denoting a 2-digit code. For example... 1 flash, pause, 2 flashes... the code would be "12." Can you see if your TV is giving a code?