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I have tv oled 65c15 I change the mother board Now it's working but after 5 min the image is booked with sound zzzzzzzzzz after it do restart agen Can you help me plz 20230606_165648.mp4 20230606_165648.mp4

I have a TV LG OLED 65C15 that has been replaced by the motherboard Now it works, and after an hour it stops working, and when I unplug the power cable and put it back on, it works again

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