Vizio E55-e2 ALL backlight goes out after approx 5 -10 min

Vizio E55-e2 ALL backlight goes out after approx 5 -10 min

I have replaced the PS board and checked voltage on PS board and it all checks out. I even tested the with volt meter on the old PS board and it tested out. I tested with volt meter after i purchased the PS board thinking it was PS issue.

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