White Screen Of Death After Reapir

Just repaired my friends iPhone last week and the iPhone got WSOD. It is a SOLID white screen which doesn't look like how other people are describing it as. I tried the old screen on it and it did not work either, still a white screen. The screen is still working and you can play music and all that. I heard it might be some circle spacer by the wifi antenna but no one shows pictures or anything of where it goes and so on. I don't have any extra pieces that I know of. Please help :( I don't know what to do!!