Original post by: Kristof Ferenczi ,
Personally the biggest issue is how you reconnected the home button flex cable at the top by the group of flex cables. I've had SO many issues with the ID not working after installing a 3rd party screen, yet always worked the first time when installing the OEM screen. The quality of these flex cables that come with the screen just aren't good enough in my opinion. Not even close to good quality sadly. All you can do is keep disconnecting and reconnecting the flex until it works and do it with the battery disconnected each time. I ended up buying a used OEM screen off ebay and it cost me less than iFixit AND everything worked perfectly the first time of install.