Why is my tv shuting off but still can hear sound

I have a 46 inch polaroid tv and it was working but had vertical lines on the right side and used to get hot then the picture started flickering and get like darker then it would shut off but coud still hear the sound now it only stays on for a minute and picture turns black? What could it 

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@meashy possibly a bad power board or a bad T-con board (vertical lines on the right side). What model is your TV?

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