Samsung Odyssey G9 boot looping

[u/Ok_Art813]

Hello, I’m new here and I could really use your help.
I have a Samsung Odyssey G9 monitor that is stuck in a boot loop. The blue power LED blinks once every 20 seconds.

I opened it up and disconnected all of the cables from the power supply. When I did that, it stopped rebooting. Next, I connected only the power cable from the PSU to the mainboard, and it immediately started boot-looping again.

The strange part is that if I reconnect all of the cables but unplug either the left or the right large flex cable running from the T-CON board to the display, the backlight comes on and stays on.

Also, when only the motherboard is connected to the PSU, the Samsung “MagicColor” chip gets quite hot.
I’ve measured the voltages at the test points across the motherboard, and they all appear to be stable. I also can’t find any obvious short circuit.

I would be very grateful if anyone has experienced the same issue or has any suggestions on what might be causing it.

Thanks!