"Touch ID not working after screen replacement?"에 답변Weird situation, I've done lots of screen replacements and they've all been smooth sailing in regards to switching the fingerprint reader over and ship it. But my wife's phone needed a new screen on her iPhone 6 A1549 64gb and I move the fingerprint sensor over and touch ID immediately doesn't work. So I put it back into the old screen and it works. Then I swap that metal plate behind the LCD, so the new LCD has the old metal plate and original fingerprint sensor, no avail. Bobby G. Is right about disconnecting the battery between swaps. This fixed my issue. So I put the old screen back on with the original fingerprint sensor, turned off the phone, opened up the phone keeping the original screen still connected and then disconnecting the battery, and removing the screen and then swapping the fingerprint sensor and plugging the shiney new LCD screen with original fingerprint sensor in then lastly reconnecting the battery. Viola! The sensor is detected and fully working.