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Screen Goes Black and No Sound

I have 4 Roku TVs. For the most part they have worked fine. But I have one that stopped working; no sound and no picture after about a year. I see a little flash of light when I turn it off and on. There is a sound of it turning off. So I was going to get rid of it, but I refused to pay $60 for that. It sat for about 6 months, and I plugged it in to see if it would work. Low and behold it worked great for about an hour, then same problem again. Anybody have any idea what the problem is?

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Re: Screen Goes Black and No Sound

I would guess that one of its circuit boards has failed (main or power supply board).  It's not something that can be fixed without taking it apart.

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