Black screen after replacing screen

Hello. I need a quick and definitive answer. I had damaged screen and the power button problems. I disassembled the phone to see if i can fix the power button some weeks ago, putted everything back ok. Now i received replacement screen and power flex cable, replaced them, everything works except i have a black screen. I used the old screen, same thing again. 99% i know the flex cables are damaged, but why the digitizer won't work too? Only backlight works on the screen. I've checked for foreign particles in the connectors but they are ok. Did the logic board got damaged somehow??:/

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