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
3 
This is usually a sign of bad backlights. Also, 48" TVs are listed as 50" for marketing purposes
Jeroen Goossens さんによる
Jennifer Turnage what is the exact model of your VIZIO TV?
oldturkey03 さんによる