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lately their is no picture just a black screen

lately their is no picture just a black screen

I have been using my last hmdi 4k input since I bought tv .and lately their is no picture just a black screen.change inputs and it works but stays on for a few seconds then shuts off and back on and after a few seconds repeats with the on and off.done everything from reset to turning off the timer help please.i have the vizio ultra 4k 50” inch even though when I bought it,it was in a 48” box believe it or not

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