Troubleshooting Tips: iPhone 6S Plus fingerprint function not working

I turn on iPhone as usual, everything goes well, after get into IOS, i found the iPhone 6S Plus fingerprint function not working, i try to add fingerprint on iPhone, no response, i try to unlock iPhone by fingerprint, still no response. Whats's going on? Here are the troubleshooting tips.

Before we start to repair the iPhone, we need to know about the iPhone fingerprint flex cable interface schematic diagram, we can check it on WUXINJI Dongle.

According to iPhone schematic diagram, we know that the left side is the control signal of the fingerprint section. The right side with MAMBA is the newly added functional Force Touch, which is called the piezo touch, for example, the reactions are different between gently point the desktop clock icon and pressing the icon by force.

If there is a failure of fingerprint addition, first measure the voltage of 1.8V and 3.0V in the picture 1-3 with the Fluke 15B+ digital multimeter. If there is no resistance measurement of the two circuits, check whether there is an broken circuit or short circuit, check the connected inductance or the bypass capacitor, the inductance can be short connected by jumper wire, the bypass capacitor can be removed by QUICK 861DW hot air gun and Precision Titanium Alloy Tweezers. If the inductance and capacitance failures are excluded, you can also try to reassemble or replace power IC--U2000.

If the addition of fingerprint will not prompt "failure", but the home button does not respond when you touch, generally it's because there is no 16.5V voltage, you can replace iPhone 6sp fingerprint power supply U4040 to solve the problem.

If the power supply is normal, the resistance of each pin is required to measure in turn. If there is an damaged circuit or short circuit, you need to check the inductance or bypass capacitor. The inductance can be short connected and the bypass capacitance can be removed by using QUICK 861DW hot air rework station.

Finally, install the iPhone to test, now the iPhone 6S Plus fingerprint function working perfectly.