Xbooow59

Alright on the iPhone 6 as well as the iPhone 5S, or any apple device with touch ID this happens because of damage to the home button or the cable leading to the home button. Let use the iPhone 6 for this example, as its the most common. The iPhone 6 has a flex cable that runs behind the screen to the the home button,nandbthe home button connects to it through two FPC connectors. the most common way to damage this is by damaging the back flex, which is EXTREMELY LIKE VERY VERY VERY easy to mess up. What this means? That anyone who doesn't know what they're doing can damage that connection and render touch ID as not working. The cable can be replaced and is very easy to do, and any shop worth its salt has several on hand, because anyone can make a slip and mess one up. Checking touch ID is a crucial step, after the repair, and should be done no matter what. Its not faulty screens, its that one cable or the home button or where it plugs into on the phone. Its entirely the fault of someone who doesn't know what they're doing. If a device comes in it should be tested before and after the Repair to MAKE SURE that everything is working, mainly touch id. Any questions? I'm a professional technician at a third party repair store, I've repaired over a hundred iPhone 6's.