iPhone 15 Pro Max randomly flickers horizontal lines - what could cause this?
I bought an iPhone 15 Pro Max (iOS 26.5) on eBay and I’m already going through the return process, but I’m trying to figure out what this issue actually is.
The phone randomly flashes/flickers horizontal lines in different parts of the display. It happens at very random moments, but I was able to reproduce it and I’m attaching a video showing it. The back glass is cracked, and the phone also took a hit on the bottom-right corner. According to the device info, the screen was replaced in 2025, but it still shows up as an “original part” in the system.
Does this look like a bad display, a damaged connector, or something else?