White Screen of Death after new screen and new battery?

My iPod got damaged in transit after I sold it and sent it off to the person who bought it and they took it out of the packaging and it had a white screen of death, he tried the solutions like "hold the power and volume button" or "restore it" etc

None of them worked, so obviously, it was a hardware issue

He sent it me back and I've just replaced the battery, LCD screen and the glass screen cover and it still has a white screen

Any ideas?