Chosen Solution
When you try to turn it on, the back light will click on the then shutoff again. It will continue to do this until you unplug the TV. I’ve already replaced the main board, power supply board, power switch, and the WiFi board. None of it changed anything. Any suggestions would be appreciated Thanks
@rich79 after you “already replaced the main board, power supply board, power switch, and the WiFi board” you got nothing left to repalce. This sounds actually like a bad backlight array. It fires up briefly but then fails and continues that cycle. For that to be fixed you will have to disasemble your TV and the panel to replace the LED backlight strips.
