42" Vizio TV Model M422i-b1 picture not working but has sound?

42" Vizio TV Model M422i-b1 picture not working but has sound?

This LED TV is not hooked up to anything. I just use it for the internet aps. In the middle of a show it made a loud pop and the picture went out but it still has sound. I turned it off and unplugged for an hour with no success. I still have no picture at all. Any ideas on what's going on and how to repair?

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