Hi @camko ,
Try the following:
Turn off the TV (if on) and disconnect the power from the TV.
Remove the back cover from the TV
Disconnect the cable between the power board and the mainboard.
Reconnect the power to the TV and switch on the TV.
The TV’s LED backlights should turn on and stay on. There will be no picture on the screen as the mainboard is disconnected.
If the screen is still dull, then you have a backlight problem.
Here’s a video that may help as it shows how to determine if the problem is the LED backlight strips or the power board.
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