I had this issue my 1st few times replacing customer's screen.
Method #1: Each time I took the home button from the screen they originally had on the iPhone & swapped it with the new home button. That then fixed the issue each time.
Method #2: For the times there was only 1 home button present, I suggested that they 1st backup their iPhone using a computer. 2ndly do I clean wipe of the iPhone. 3rdly restore the iPhone from backup. Which will replace all of your files & settings back into your phone as they were.
Both of those methods worked every time I ran across that issue. However, if neither of the 2 fixes work for you, then YES. It is indeed a hardware part that has been damaged during the screen replacement & you should order a new piece.
If you get the "touch ID" error when installing the new piece it is only due to the old home button being registered to the iPhone's system itself & will be fixed with method #2.
WHEN RESTORING, UPDATING OR FRESHLY INSTALLING IOS ON THE IPHONE, THE PARTS REGISTER TO THE IOS SYSTEM OF THE PHONE. Hope this helps you guys & gals.
This may be a dumb question but was the phone powered off and battery unplugged when you plugged in the front display cables?
If not you will need to turn the phone off and on and try the TouchID again.
Otherwise you probably either have a damaged home button ribbon connector / home button extension cable (the one that comes on the metal back plate to sit behind the screen assembly) or you are using a different home button and not the original one that is linked to the logic board.
The iPad deactivates the Touch ID Function permanently even for the original Home Button "maried" to it if you only one time connect another or no Home Hutton an swtich it on.
Alsways connect the original Home Button to the Display Assembly and then connect the Display Assambly an then Switch the iPad on otherwise the Touch ID fundtion is gone for no good reason eccept to pester and annoy you.
This sabotage bevahiour has no protective justification. It is possible to replace broken wires on the Touch ID Home button with the Touch ID still working means it is possible to Tinker atnd lissen to the cummunication over those wires to try to reengineer the security function without the device noticing it so disabeling the Touch ID function isn't protecting anything.
door Mini SAP
From my place it seems to be that if the screen is an 'after market' one. (i.e. non apple). then it comes with some firmware whcih isnt compatible with the apple firmware button. the new screen firmware is identified and blocked by apple. Try a full restore and if a full restore is prevented by iTunes because it doesnt recognise your phone then this is most likely the answer.
door jay grand
If the replacement screen is not an original Apple screen then the touch id will not work. You must replace the after market button with the original apple button from your old screen and even then it may not work. You must swap the buttons over before the replacement screen is connected to the phone. If you want the touch id to have a chance at working don't connect the replacement screen before the button is changed over.
door Paul Ingarfield
Ok I did all that and it still does not work! I read that there are defects in the ribbon that connects to the home button , which runs under the las plate!
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