Chosen Solution
I recently purchased a replacement display for my iPhone 6 because my old screen was bulging out. I got a new replacement screen for $18 on eBay the display stopped bulging out but the display is not turning on iOS 12. why?!
Did you fix the phone then update? This can cause the phone to brick. If the phone is working then you either damaged the screen during the repair or the screen was already faulty
If your screen was bulging out, it seems more likely due to the battery swelling than the screen being faulty. Have you inspected the battery at all? It could be that it died and won’t take a charge. Also try putting the old screen back on and see if it works, and report back.
