iPhone SE backlight working, but not displaying anything

Im working on this SE, and the backlight works but no image or apple logo or anything shows up.

From what I understand, the person was using the phone, left for like 5 minutes and when they returned, the screen was white, then it stopped working. The phone itself works fine, detected by itunes, vibrates, but no image.

Ive tried a hard reset, a factory restore, the flashlight test to see if any image is showing, and swapping a known good screen on with no change. The inside of the phone looks perfect with no dust or any water damage or anything.

Anyone have anything else to try, or any clue on whats going on?