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Hi there
Since I feel rather comfortable taking electronics apart and fixing them, I thought I would give it a shot here. Sadly I have no idea what part could be failing here, but I have videos that show the problem. It came kinda out of the blue.
https://drive.google.com/drive/folders/1...
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@magnu18559 looks like your TV is running into backlight issues. Could be that some of the LED's are starting to fail. It is also possible that this is related to the power supply not providing proper backlight voltage due to bad capacitors (unlikely). My prime suspect are the backlight strips. Yours is a 75inch panel and there will be quite a few strips. It is also a Pain to disassemble because of its size. It can be done, just make sure you have the room and plenty of hands to help you with that.
To check your power board voltages etc, we would need to see your board. Whenever you can, remove the back cover from your TV and let's have a look.
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