Question Sony TV wont show video

Apr 6, 2020
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I have a Sony XBR65x900E TV that when I power it on the back lights come on but no picture. There is a cable that connects the Main board to the LD board that if connected the backlights will shut off completely. I have replace the Main Board, LD Board, and the TCon board. It seems like the ribbon cable that connects the Main board to the LD board is the problem and I am not sure how it is supoose to be connected or if its a bad cable. I need to know what connects the Main board to the LD board.
 

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