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Tutorial: iPhone 6S Plus Fingerprint Repair

We are going to learn how to fix iPhone 6S Plus with different types of fingerprint function failure today, how should we fast find out the damaged part and repair? Let's follow the article step by step!
 

Connect the WUXINJI dongle to the computer to check schematic diagram of the fingerprint flex cable interface. As shown in picture 1-1.
 

By reading iPhone 6S plus fingerprint flex cable interface diagram, we can find that it is a little different from the iPhone6 plus circuit. 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, as shown in picture 1-2.


We conclude three situations for iPhone 6s plus fingerprint failures:

1. 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.

2. 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.

3. 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. If the inductance and capacitance failures are excluded, you can also try to reassemble or replace power IC--U2000.


More professional cell phone repair tutorials, please check on www.vipfixphone.com

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