Backlight works but no images on lcd after install.

So I received my "high quality" screen from ifixit and installed it super smooth as 50 times before and it worked for about a day then customer asked why 3 buttons on the screen didn't work then apparently the phone powered off and all I could get on that screen was the backlight and 2 purple lines about a fourth in on the right side. So of course I went to slap another screen on and even tried oem but all I get is a backlight. Have tried home and power and disconnect battery and plugging it up with no success. HELP!