Chosen Solution
I did a battery replacement and I did something I probably shouldn’t and didn’t need to do, I removed the screen. Before, this phone just had a water damaged (but working) screen and a spicy pillow. Now after power cycling, repositioning the connector, and hard resetting, it still shows this. It’s different every time, but every time it turns on from boot, everything is fine until the apple logo turns greyish. The screen starts turning black from the bottom and spreads throughout the screen slowly as i use it. It also has a similar effect to burn in.
Is this circuitry damage or did the battery expanding inside destroy the screen?
@erse double check your complete work. From what you said the prior battery had expanded so yes, that could be an issue that will require a new screen. the only other thing I wonder about is how you handle the water damage. Double check your connector for bend pins on both the board and the cable connector. After that, I recommend you get a new display and change yours. If nothing else it will give you a known-well starting point for further troubleshooting. iPhone 5 LCD and Digitizer Replacement
