How to fix iPhone SE fingerprint error with logic board repairing

Today, we are going to talk about iPhone SE fingerprint error. The iPhone SE fingerprint function not working well, when you want to turn on fingerprint, it is failed, and when you want to add fingerprint, it is failed. In this article, we will fix it with iPhone logic board repairing.

1. The iPhone SE fingerprint can't be opened smoothly

Disassemble the iPhone SE by phone opening tools, and then remove the iPhone SE logic board.

Use multimeter to measure the iPhone SE to check whether there are the 1.9V (PP1V9_MESA) and 3.1V (PP3V1_MESA), you can test it by pressing the iPhone power button.

If the 1.9V (PP1V9_MESA) and 3.1V (PP3V1_MESA) doesn't exist, then you can fix it by short connect FL4100 and FL4105.

If both the 1.9V and 3.1V are exist, then use Fluke 15B+ Digital Multimeter to measure the diode data, if the data is infinitely large, check the corresponding circuit, and short connect FL4110, R4111, FL4112, FL4114 and R4116.

If the voltage or diode data is abnormal at the beginning, after repairing, the data back to normal, but the iPhone fingerprint still can't be opened, you can fix it by flashing iPhone or erase all data on iPhone SE.

2. If the iPhone SE fingerprint can be opened smoothly, but the iPhone home button is not responding when adding a new fingerprint.

Measure the diode data for this pin (as shown in picture 1) to check if it has the diode data.

If it has no diode data, then use QUICK TR1300A hot air rework station to short connect FL1407.

If it has the diode data, then use Precision Titanium Alloy Tweezers to replace the new U4040, because the damaged fingerprint power supply U4040 can cause iPhone SE adding fingerprint failed.

Tips:

You can check iPhone schematic diagram on WUXINJI Dongle, you can find those position easily.