Chosen Solution
I just replaced the battery on my iphone 8, No problems with that repair. But the home button no longer works, Touch ID and haptics work, but home button is dead. The Button/touch ID assembly at the bottom of the phone is in perfect shape, no cuts, breaks bent parts, I never even touched that part but I checked anyways after. I even messed with the tension on the screws to see if that was the problem The only thing that looks like a possibly is a extremely small tear on the the digitizer cable right before it connects to the logic board, although the tear is less than a mm into the cable and it doesn’t even look like it reached the traces. This seems strange as disconnecting the display was the second step in all of this and I didn’t mess with anything in that area of the phone
If you see a tear, it is a tear. It is super easy to tear this cable. In the factory or repair service center, there is probably a fixture holding the screen up while assembling to remove any possibility of tearing it. In DIY scenario, the cable is often torn because the user just laid the screen flat.
