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My friends HDTV shuts off randomly goes pixelated and shuts off


He is really frustrated he got the TV last November on black Friday. He says when it shuts off the button indicates its blue which means its on, but the screen is black. Why is it doing this and how could he fix it? Its a 32 inch HDTV It does this when playing a video game or when watching tv not when using the computer as a monitor

 
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