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Check to make sure that eco mode is turned off. It will sense the ambient lighting and if it is bright, the TV will be bright so if you are seeing the brightness change...check that setting first.
This is a circuit board issue. Your going to have to call LG and find someplace to have it fixed under warranty. Open box items cannot be returned so LG will give you someplace around your area to bring it for the repair.
I just came across this problem. I called in, and they said there was a power switch right beneath the light on the bottom right edge of the tv. So I decided to look down there and it was switched to off. Switched to on and that was the problem. I didn't even know there was a button there, but apparently one of my friends turned it off while he was drunk.
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