How to Fix iPhone Touch ID Not Working Due to Broken Flex

iPhone users can feel hopeless when their iPhone home button Touch ID has issues and doesn't work even after replacing the home button. Why? For iPhone 6 and later versions, users who change the Home button will lose the Touch ID fingerprint function due to damage to the Home button Touch ID flex. Today we'll show you how to fix the iPhone home touch sensor assembly, so let's take a deep dive.

Power on and test. "Unable to activate Touch ID on this iPhone". Press the Home key and the return function is normal.

1. Remove the display assembly

Remove the two screws on the bottom. Use a heat gun to soften the adhesive underneath. Hold the iPhone firmly and close the suction cup handle to slightly separate the screen from the back of the phone.


Slide the opening pick around the top corner of the display. Open the iPhone by swinging the display up from the left side.

Remove the five tweezers securing logic board connector brackets, then remove the brackets. Pry the battery connector out of the slot on the logic board. Disconnect the front panel sensor assembly connector.

Disconnect the OLED panel cable connector. Pry the digitizer cable connector from its socket. Remove the display assembly.

2. Locate the fault

Check logic board connector J2118 for mold, dry connectors, and measure the resistance between J2118 and ground with a mechanical multimeter. Everything is fine and the value is normal.

After removing the Home Touch Sensor assembly, we found that the Home button cable had broken traces.

Therefore, we can preliminarily judge that the Touch ID failure is caused by a broken cable circuit. The solution to the problem is to replace the broken part with a new flex cable.

3. Replace the broken part with a new Home Touch Sensor assembly

Use tweezers and a soldering iron to pry up the backplate and use a carving knife under a trinocular microscope to cut the broken part from the flex cable. Scrape off the flex cable circuit.


Apply some BGA solder paste flux to the flex cable and solder it with a soldering iron. Clean with PCB Cleaner after cooling.

Pry up the back plate of the new Home Touch Sensor assembly. Cut a length of flex cable from the new iPhone 6 Home Touch Sensor assembly.

Secure the newly cut cable with double-sided tape. Scrape off the freshly cut flex cable circuit.

Use a soldering iron to spread some BGA solder paste on the freshly cut flex cable and solder tins with soldering iron. Clean with PCB Cleaner after cooling.

Cut off the excess of the freshly cut flex cable. Apply glue to the bonded part and carefully glue and align the two cables in place.

Secure the cable, apply some BGA solder paste flux and solder the flex cable. Clean with PCB Cleaner after cooling. Mount the home touch sensor assembly on the screen.

Then snap the display assembly onto the logic board. Power on and run the Touch ID functional test. Touch ID is back to normal.

4. Test

Remove the display assembly, take out the Home Touch Sensor assembly, and glue another length of cable to the previously glued part.

Solder to further secure the flex cables, and carefully glue the backplate on. Mount the home touch sensor assembly on the screen. Snap the display assembly onto the logic board.

After that, power on to test. The phone has normal and Touch ID functionality.

The above is about sharing some iPhone touch ID repair skills, I hope it can help you. If you want to know more about phonefix, please leave a message in the comment area below.

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