iPhone 6 Plus fingerprint function not working - HERE FIX

A customer said: "Why has repaired the WiFi fault and camera circuit, the camera 2.85V Camera Flash Control IC U2301 has been replaced, the fingerprint cannot be entered,How to fix it"? When your iphone 6 Plus appear Such this problem , This is the worst. Let's following the VIP Pro Shop Team solution guide to fix this problem.

Fault phenomenon:

The customer has repaired the WiFi fault and camera circuit, the camera 2.85V Camera Flash Control IC U2301 has been replaced, the fingerprint cannot be entered, as shown in picture 4-7-1.



Repair process:

According to the customer's description, Camera Flash Control IC U2301 has been repaired, because the position of U2301 and fingerprint power supply IC U2100 is close next to each other. After the check, we found that U2100 is slightly damaged, so we are determined to remove one from the motherboard, soldering Tin ball and reinstall to failure board, then boot and test it, but the fault is still the same. Next, we start to measure the output pin A2 pin of power supply conversion IC U2100 with multimeter, see if it has 1.8V voltage output, find the peripheral capacitance C2181 and test it; we found that it could measure to 1.8V. 

The picture of the fingerprint power conversion chip U2100 replacement is as follows, 4-7-2


Based on the above measurements, the power supply is normal, which means the U2100 circuit is installed. According to the principle, now we only can measure the diode data of J2118 pin on the motherboard first, after measurement, we found that the diode data of sixth pin on J2118 is infinity, which shows there is a disconnect between this line and fingerprint boost chip. Check it in the schematic diagram, we know that there is a inductance from sixth pin of J2118 to fingerprint boost IC U1503, we can found the diode data on first pin of inductance.

The conclusion is that the inductance FL2156 is inveracious soldering or damaged. Put it under the microscope, and remove the black glue around the FL2156, paint the UV solder flux and then solder it with soldering station, as shown in picture 4-7-3. 


Once again to measure the diode data of sixth pin on J2118 adapter, the data is no longer infinitely large. Turn on iPhone and test it, the fingerprint can be entered normally, as shown in picture 4-7-4.


Tips: If you’d like to know more about the preferential iphone repair tool maintenance please read on www.vipprogrammer.com. all of these phone repair tools, and you can find it.



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