The iPhone facial-recognition / Face ID unlocking technology is quite convenient, but the repair of Face ID issue is also a headache. In this article, we gonna share some iPhone Face ID not working repair guidelines for your reference.
First we should know the structure of Face ID function relative parts and the working process of face ID.
The main Face ID function relative parts
- Proximity sensor
- Flood illuminator
- Infrared camera
- Dot projector
The brief working process
1. Proximity sensor works when the user gets close to the phone
2. Flood illuminator start to work when receiving active signal from the proximity sensor
3. Infrared camera capture the flood light which is outputted by flood illuminator
4. Dot projector start work to emit around 30,000 dots on the human face
5. Infrared camera works again to capture the 3D model generated by dots projector
6. CPU process the image data captured by the infrared camera and front camera for either enrollment or comparison to the enrolled Face ID data
The main reasons for Face ID function failure and solutions
1. The transmittance of the tempered glass is not good enough
The infrared light may cannot get through the poor quality tempred glass.
Solution: Replace a qualified tempered glass would be the fastest way to solve the Face ID not recognized issue.
2. The flex cable damage caused by battery replacement or drop damage, etc.
Solution: for issue which caused by the flex cable crack or damage, ask a qualified technician to repair, jump wire or replace the flex cable to fix the issue.
The reason we need a qualified person to do this is because fix the damaged cable required excellent soldering skill and should be very patient and careful, so that to avoid damaging the encrypted chip inside the module.
Tips: sometimes the flex damage is caused by improper operation when replacing new screen or battery, so please ask the qualified person to do the screen or battery replacement.
3. The encrypted chip that inside the dot projector module is damaged
(The most common reason to cause the face ID function failure)
Solution: For this kind of issue, in short, we should replace the inside encryped IC.
But the dot projector IC is encryped, so we should use some programmer like the I2C Dot Projector Repair Programmer or JC Programmer to read and rewrite the data into a new chip. And the operation of this process with so many details that need to pay attention, so this kind of repair also requires the repair technician with excellent handwork and experience.
REWA Academy will teach the detailed operations process, and you can also have the chance to get the live training to learn and communicate with our repair masters online.
4. The defective of components on the motherboard
On the motherboard, there are also some circuits and chips relative to the Face ID function.
For example, below is the circuit of iPhone 11 Pro dot projector
Solution: troubleshooting based on the theory like schematic, block diagram and working process to find out and replace the abnormal components.
Interested to know the detailed working and troubleshooting process? Want to help more clients to solve the headache issue? Or wanna to be a repair expert?
Go to join REWA Academy Face ID Course to start the ZERO TO HERO repair journey!