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NOGIS TV: Mainboard "tp.ms3458.pc757" stopped working

Hello Guys.

I hope to get some help from you.

My TV suddenly stoped working.
No reaction whatsoever.
Only when in unplug the TV, and try to start the first time after power off and on again, the startscreen flashes for some milliseconds and then turns dark again.

I researched this problem, which seems to be a common malfunction if the backlight has some issues.

So i already disasembeled the device to get to the led-strips.
All the led-strips seem to work properly.

Thats why i think the issue might be burried on the PCB Board.

Would appreciate any suggestions on troubleshooting the Circuit.

All the best.