It could be just the power supply, internal or external. I would try to plug it into another outlet, transformer, and/or surge protector. Also, check to see if the surge protector circuit breaker has tripped, and check the house circuit breaker in the panel. If none of these is the problem, it could be the power supply or capacitor inside the TV. Google it. If it is an expensive TV, call your insurance company, and also implement the TV warranty. Good luck.
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