My iPhone 12 Pro Max was knocked out of my hand at a festival, and the screen went completely black. Since I had just moved to college and needed a working phone quickly, I took it to a nearby repair shop instead of an Apple Store. They replaced the screen in about an hour for $75.
Since then, I've noticed a pink tint when viewing the phone from an angle, thicker-looking screen borders, and possibly slower charging. The Settings app also shows "Display Not Recognized." I initially checked for a swollen battery and didn't see anything obvious, but I'm now worried that the screen may be lifting or bulging near the top. I've turned the phone off and disconnected it from power. Is this likely just an aftermarket display warning, or could it be a battery or safety problem? What should I do next?
3 Answers
The “Display Not Recognized” message usually appears when an iPhone detects a replacement display that it can’t verify as a genuine, properly paired part. An aftermarket screen can also have different colors, borders, touch response, brightness, or power usage. That message alone doesn’t mean the phone is going to explode.
However, if the screen is actually lifting away from the frame, the phone becomes unusually hot, smells strange, makes noises, or starts swelling, stop using and charging it. Keep it away from anything flammable and have a qualified repair technician inspect it as soon as possible.
Because this is an iPhone 12 Pro Max without extended repair coverage, the low-cost shop probably installed a third-party display. That would explain the warning and the visible differences. Apple or an authorized repair provider can inspect the display installation, check the battery, and confirm whether the frame or battery was damaged during the drop.
Don’t press the screen back down or keep charging it if you believe it’s bulging. Taking photos of the gap and contacting the original shop about the repair warranty may also be useful.
A pink hue when the phone is tilted can be a characteristic of a lower-quality replacement OLED panel, but a raised screen is a separate concern. Since you think the top is bulging, shutting it down and unplugging it was the right move. Have Apple or another reputable technician examine it before turning it back on, especially if the display is separating from the frame.

It isn’t getting noticeably hotter than usual, but I’m still going to leave it powered off and take it in when the store opens. I’d rather have them confirm that the screen and battery are safe than guess.