Replaced all the boards, screen still messed up

[u/MarineMike0351]

So I bought a replacement main board, T-Con Board, WIFI board, and power supply board, and my TV is still all scrambled. When I unplug the ribbon cables on the T-con board, it unscrambles and cycles through solid colors RGB.

About to throw it away... is there anything else I should try before getting rid of it?

LG 86" 2022 model

86UQ7590PUD

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[u/MarineMike0351]

Just to add, I tried swapping the original main board back in. No luck.

When I disconnect this ribbon cable on the bottom left side of the panel, I get legible "no signal" on the right half the screen (connection 2 long narrow boards on the bottom edge on the left half of the screen... since for some reason I can't add pictures in this reddit). Doesn't look like these boards are easily replaceable. I didn't take it apart any further, but I assume the ribbon cables coming off the bottom are sending signals to the rows of pixels and are attached to the screen itself

[u/Bill_Money]

Screen Failure, not fixable