How to Fix iPhone 11 Pro Max Face ID not working

Dot projector parts are extremely fragile. A fall or water damage may harm dot projector parts, inducing Face ID not working.

This article explores a breakthrough method developed by REWA LAB for repairing Face ID, making it accessible and effective.

The Problem

The heart of Face ID lies in the dot projector integrated circuit (IC), a critical and encrypted component. Replacing this IC necessitates a complex process involving data encryption bonding, which repair technicians typically find daunting.

The Solution

Fortunately, REWA LAB has devised a streamlined and efficient approach to resolve Face ID issues.

The step-by-step guide presented here will help you understand and perform the repair procedure.

Step 1: Initial Diagnosis

• Begin by navigating to your device’s Settings, then select “Face ID & Passcode” and “Set Up Face ID.”
• During the setup process, you may encounter the message “Move iPhone a little lower/higher.” This indicates a malfunction in the dot projector.

Step 2: Disassembly

• To access the dot projector, remove the device’s display.
• If you observe a red mark, it suggests that the phone has experienced water damage.
• Connect the dot projector flex cable to the I2C Repair Programmer and perform a diagnostic test, confirming a malfunction.

Step 3: Data Transfer and Crystal Fix

• Use the programmer to read data from the malfunctioning flex cable.
• Replace the flex cable with a new one and transfer the previously read data.
• Apply a small amount of UV adhesive to secure the crystal of the dot projector flex cable using a UV lamp.

Step 4: Removing the Dot Projector

• Remove the foam covering the back of the dot projector.
• For precise alignment during reassembly, mark the module with a Sculpture Knife.
• Lift the metal plate to access the dot projector flex cable beneath.

Step 5: Precision Work

• Utilize a Holding Fixture for precise handling of the Face ID module.
• Grind the welding position of the metal plate to access the dot projector.
• Carefully detach the dot projector module using a Hot Air Gun.
• Remove the MOSFET by heating at 320°C.

Step 6: Soldering and Reassembly

• Apply Solder Paste to the bonding pad with a Soldering Iron and jump wire between pins 2 and 3 of the MOSFET using 0.02mm copper wire.
• Clean the dot projector module with rosin and solder-wick, followed by PCB Cleaner.
• Reball the new flex cable, apply Paste Flux, and solder it to the dot projector module.

Step 7: Testing and Final Assembly

• Connect the soldered flex cable to the I2C programmer and run a test.
• If the test passes, attach the flex cable to the Holding Fixture and align it with the dot projector module.
• Apply 460 Adhesive to secure the components.
• Install the flex cable in the phone.
• Power up the device and configure Face ID settings.

Conclusion

By following these meticulous steps, you can successfully restore your device’s Face ID functionality. The fault will be cleared, and your phone will regain its secure and convenient authentication feature. 

Please feel free to visit our online shop for repair parts and tools.

Watch the video below to get a more detailed iPhone 11 Pro Max Face ID repair.