I have a Samsung 8K TV (2018), model QE65Q900RAL. The TV does not power on and there is no backlight. The standby LED is on normally. After pressing the power button, the LED turns off, but after approximately 10 seconds it flashes an error code: 1 blink, which indicates a mainboard issue. After that, the TV enters a boot loop: the relay inside the One Connect Box clicks and the cycle repeats.
I checked the mainboard and both backlight driver boards. All voltages appear normal, there are no shorts, and there is no visible damage.
The backlight is controlled via a flat...
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