It seems this is a common problem....I too have a UN65KS8500FXZA TV doing the same thing. It turns off and on in an endless cycle. turned off for 12 hours, no change. I had a geek squad a tech visit yesterday and stated this could cost $1500 to repair and he advised to just go get a new TV!! This is only 2 years old. I am livid with Samsung .
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