Why is my back and recent apps button not working

[majortech4388]

I have a Samsung Galaxy Tab A, and cracked the screen. I put a new screen on but the back and recent apps buttons do not work. Also, the touch is not working the way it should. I thought it may be just a bad replacement part, so I try another screen with the same results. Any suggestions?

 

[mustang7757]

You did the screen replacement?

 

[B. Diddy]

Welcome to Android Central! Which Tab A model (i.e., which year)? Does it have physical Home/Back/Overview buttons, or onscreen buttons? I doubt physical buttons would be dependent on the screen.

 

[Rukbat]

This is why I always say that opening a phone is not a DIY project. You probably loosened a connector or tore a cable. Now you have to open it again and check everything with a magnifying glass and a strong light (and I'd redo every connector that can be redone).