Display destroyed - every 5 second phone gives charging indication signal

So I dropped my iPhone 5S and shattered the glass. So I tried to remove the screen assembly. Since I don't have the spare screen yet I closed it again. Since then I don't see anything at all - no biggy… If I connect the phone to my Mac it still gets recognised. So it should still working properly… Problem though is that every 5 seconds the phone gives a charging indication signal. On loud it makes that "plem" and in silent it vibrates twice.

If I get a new display does this solve the problem? Or is the logic board damage aswell?