My Vizio M75-E1 turns on with no backlights

My Vizio M75-E1 turns on with no backlights

TV turns on, but no visible image on screen. When I do the flashlight test, I can see the menu and move through it. Also, audio, HDMI pass through, ARC, networking/streaming all are working fine so the main board appears to be OK. I am thinking one of the 2 LED driver boards are shot or possibly the power supply board is faulty? Has anyone seen the same situation before?

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