iPhone X Face ID Not Working

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Malfunction Phenomenon

Press the power button to power on, the Face ID function cant work normally. Besides, the rear camera cant work neither.

iPhone X Face ID Not Working

Trouble Shooting

Take apart the phone and run the cosmetic inspection of the motherboard. After checking, the cosmetic of the motherboard is in good condition.

For the iPhone X Face ID Not Working issue, the fault is related to the rear camera. Firstly, we need to measure the Telecamera connector J4000, the measured diode value of pin 27&pin28 is 1700, which is larger than the normal value (normal value is around 820).

iphone x face id not working csb5j

According to the circuit block diagram and the bitmap, the fault is might be caused by the false solder of Q3700.

iphone x face id not working

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iphone x face id not working e2mls

iphone x face id not working

So we can try to resolder Q3700then make the upper layer and lower layer solder together, and assemble it and test again. After that, the problem resolved.

Tips: In this case, there is more than one issue. So we need to check the problem which normally would be easier to fix.

Here, we measure the diode value for the rear camera connector first. 

iPhone X Motherboard Repair Course

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REWA Academy

As an enthusiastic educator and expert in mobile technology, REWA Academy has dedicated its career to empowering individuals through technical education. With a keen focus on cellphone repairs, they have developed comprehensive online and offline courses at REWA Academy. Their expertise spans a wide array of areas, including iPhone repair training, phone hardware, software, and advanced troubleshooting techniques. Through their writings, they aim to demystify mobile technology complexities, making it accessible and understandable for both novices and professionals in the field.

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