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Hello, everyone!
I excuse myself for not speaking in russian. We changed the mainboard that got struck by lightning to another one what was from a broken screen. The original is an 55UK6950PLB, and the donor board is 55UK7550PLL. The original panel was an LC550EGG the donor board was with an LC550EQG, the difference is that the tv that was at us for repair is with RGBW display and the donor board was set up with RGB display. The TV had black and white colors and after exchanging the r506 resistor from 2,7kohm to 8,2kohm the screen came back to life. Just an example for someone else who needs this information.
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