No touch after audio ic replacement.

I replaced the audio ic on a iPhone 7 and after i put the phone together, the touch doesn’t work. I already tried a known working screen to rule out that problem and it still doesn’t work. I took the logic board out again and only plugged in the battery, charging port and screen and the touch worked fine then. I found that weird so i started to gently press on the logic board and i barely have to press it a tiny bit and the touch stops working immediately. If i release the pressure, the touch works again. I replaced the Audio ic once more just to be sure i wouldn’t messed it up there and i still have the same issue. I’m assuming i might have shorted or overheated something while replacing the audio ic but i can’t find anything.

Has anyone else run across this problem or anyone some tips and ideas on where to look for problem?