It is well known that Touch ID chip is exclusively matched with the motherboard. If change a new home button only, the Touch ID function disappears as the unique chip is also changed. So if the home button is unfortunately broken, How to fix iPhone Touch ID not working? Here is the solution!
1.Turn on the phone, unable to activate its Touch ID.
2.Go to settings – Touch ID & passcode – enter your passcode, fingerprint is grayed out.
3.Take down the home button flex cable.
4.Check the home button flex cable under the microscope, we found that the ribbon cable is broken.
5.Scrape the coating off the wire on the ribbon cable with knife.
6.Apply some BGA paste flux and solder the tins with soldering station.
7.Scrape the coating off the wire on the reverse side.
8.Apply some BGA paste flux, then solder the tins with soldering station.
9.Cut the wires then align them correctly, heat it up with hot air gun and weld.
10.Turn the flex cable to the reverse side, weld it with the wire.
11.Test if it is short circuit with digital multimeter.
12.Install the home button and test.
13.Apply some UV curable solder mast on the wire to fix the wielding joint.
14.Install the LCD screen assembly and test, fingerprint works well.
Mobile Phone Repair Platform: https://goo.gl/x70wgA
Electron Microscope: https://goo.gl/LgTEq1
Digital Multimeter: https://goo.gl/8oKwzc
Soldering Station: https://goo.gl/HsVtzw
Hot Air Gun: https://goo.gl/HsVtzw
Glass Lens: https://goo.gl/9wcIfr
BGA Paste Flux: https://goo.gl/OzHILP
Screw Drivers: https://goo.gl/rxI8y2
Anti-static Wrist Strap: https://goo.gl/rzu4Nm
LCD Opening Pliers: https://goo.gl/MV2iQn
iPhone touch id not working
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