@anthonyblue i think you already solved this on your own. "This time I was able to locate an image of the Vizio Logo in the middle of the screen" If your TV has a failed main board, you will not get an image. Same with the T-con board. You are not getting a backlight. The main board tell the power board to turn the backlight on. Check that voltage on the connector from the power board to the main board. We need to see all of your boards and the way they connect. that way we can hopefully find out where to test the voltages etc.
Ultimately, the way you describe the error and knowing its a Vizio, this sounds like a failed backlight array (strips)
Also, Vizio uses a hodgepodge of parts and the QC is pretty crummy. Do not rely on factory tape but ensure that connections are good. They have had issues with failing solder on board connectors etc. Check everything carefully.