famicomman89 your boards look good and I cannot make out any obvious damaged component. Vizio is a bit of an odd brand since they are using a hodgepodge of parts and boards. QA is not always perfect so they have had their fair share of bad solder connection. Remove your wires and reseat them after you check their connectors. Check the solder on those. It should appear in a shiny silver. Dirty grey with cracks could be indicative of bad solder connections snd might require a reflow.
Since you can see the screen with a flashlight your main board is most likely okay. The issue should be either the power board or the backlight strips themselves ( another common Vizio Achilles heel). I would measure the voltage on the power board to the backlight LED’s (set your voltmeter on something like a 300 V scale and see what you get). If the voltage fails it’s most likely your power board. If it does not, you may have either failed backlight strips or connector issues. Let us know what you find out.