Replaced iPhone 6+ screen, now calls dont work/drop through ear mic

[iMore Question]

Basically did a screen replacement on my ATT iPhone 6+ and everything seems to function except for the ear speaker when the proximity sensor dims/turns off the screen. It'll either just hang the call up immediately or stay silent and then after several seconds when the screen turns back on (after I pull my face away from the screen) it'll start working or hang up. I've taken it apart a couple times and the speaker flex cable seems fine and all the contacts are touching. Any ideas what it could be? THANK YOU!

 

[pkcable]

How did the original screen go? Was it a drop? Perhaps more is broken inside the device? This is a VERY advanced topic, BUT since you are already down the rabbit hole, I might as well take you further.

https://support.apple.com/en-us/HT203034

That support doc tells you about the iOS diagnostics you can run. You MIGHT want to google the topic also and watch some youtube videos.

 

[H3aTeRzz]

It's also possible that the flex cable is damaged, internally, not visible, they are very cheap to replace. Hope this helps!