Touch ID works but not the home button turn function
So i’ve experienced something new today and i can’t say it’s a nice experience so far.
A customer gave me their phone for a screen and back cover replacement. It was turned off on delivery. I turned it back on to do a pre-check of everything before in started the repair. Everything looks fine expect for the home button. When i pressed it there was no vibration feedback or sign of something happening. It still read my finger though.
So naturally i thought it’s because of the screen cable as the screen was heavily damaged.
I replaced the screen and tried again. Still the same issue. I had the customer try with her thumb and it reads it and unlocks the phone, but still no return function. The customer says it was working fine this morning.
So i tried new screen, the original screen, checked add the connectors, checked if i somehow damaged the home button cable and did a firmware flash of the phone. Everything looks perfectly fine. So i assumed it might be a late reaction to the fall and tried replacing the home button. I knew that touch ID won’t work but the return function should. But still nothing.
I’ve tried finding the schematics for iPhone 8, but so far no luck. Can’t be that different from the iPhone 7? The phone runs IOS 12.4 updated yesterday.
So what can i do next?
Have anyone experienced something similar?
Anyone have a solution for this?