So this morning our 2 y/o 55" Vizio TV lost its picture (but not sound). Some internet research point to the power supply board as a frequent culprit, and I found some videos on repairs. After removing the rear panel (18 screws), I was able to identify the proper board and ordered a replacement from shopjimmy.com. Specified FedEx overnight, but that probably means getting the board on Tuesday.
Probably won't be buying any more Vizio products in the future.