Chosen Solution
I can see the vizio logo if I use a flashlight when I turn tv on but then it powers off seconds later is this due to a bad main board or bad backlights so i know which to look to replace.
fandrade210 could be the main board. Since there are no schematics we will have to try and piece it together. There should be a BLOn connection on your main board. Check the (DC)voltage on that. If the main board does not send the Backlight on signal your TV could be failing it’s POST and then turn off.
