Try unplugging the TV's power cable from the wall outlet for a minute or two. Then plug it back in. This will allow the capacitors inside to discharge and then recharge somewhat (you can hear that with the high pitched rising tone when you shut off and turn on this tv), and also 'reset' the power supply due to a power surge or static build-up. I had the same problems you were having and tried a bunch of things, then finally power cycled the TV (as described above) with great success. Good luck.
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