iPhone 6 Plus Fingerprint Not Working, How to Fix?
At our daily life, no matter how protect our iPhone safe and intact, there can still makes damage our iPhone, like the LCD touch screen, battery, camera, speaker, earpiece, fingerprint, etc. If you're still within the provided one-year warranty and your phone doesn't show signs of accidental damage, head on over to Apple. As long as you're covered by warranty, they will replace your phone or perform any necessary repairs. But those without the warranty's iPhone, we has the method to solve too. Now Vip Fix Shop Team will tell you how to fix the iPhone 6 Plus fingerprint not working, hoping you can benifit from it.
Fault Situation:
The iPhone 6 Plus has the Wi-Fi Chip fault. The camera circuit and the 2.85V power conversion chip has some problems, and the fingerprint cannot be entered. Picture 1-1.
Reapir Process:
1. The customer described that the power conversion chip U2300 has been repaired, and it is closely with the power conversion chip U2100, the U2100 has a little damage. So we removed one U2100 chip from material board to do a solder ball and reinstall the fault plate, then we open the iPhone and find the fault is still existed.
2. Then we start to measure the output pin and check if it has 1.8V voltage output of the power conversion chip U2100. We measure the peripheral capacitance C2181 and find it has 1.8V. Picture 1-2.
3. So, according to the above measurements, we find the power supply is normal, and the U2100 circuit is recover. Now we had to measure the diode value to ground of the fingerprint seat J2118 pin with the DC power supply, then wen find the ground diode value 6 is infinity, it means this line to the fingerprint boost chip has open rode phenomenon. We find the inductance at the fingerprint seat J2118 pin 6 and fingerprint boost chip U1503, when we measure the pin1, we find the ground diode value.
4. At this time, we have the conclusion that is the inductance FL2156 is weld or damage. So we remove the vinyl around the inductance FL2156, make up tin and add welding. Then measure the J2118 pin 6 again and find the ground diode value no longer infinity, and the enter fingerprint is normally. Picture 1-3~4.
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