iPhone won’t start with new screen but works with the old broke one

My friend came in and had me to change his ip 7 screen which wos totally broken . So I changed the screen and everything went great but when I tried to start it the phone didnot startup it started as long until the Apple logo showed up. So I checked all connectors and everything and still the same issue. Then I thought lucky me I have one more spare screen so I decided to try that one and same issue once again. Well I now tried the old broken screen and suddenly the phone booted up.

The phones home button doesn’t work neither did the proximity sensor but howecome it started up with the old broken screen and not with the 2 new ones?