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Face ID stopped working after screen replacement

Hi I’m an experienced self-taught repair technician and have done numerous repairs but there was an iPhone 11 that I did a screen replacement on before and the Face ID wasn’t blocked. That same customer came back to me to get another screen replacement (with the same phone) a while after and once I did it the phone said “Face ID is not available at this time. Go to settings for more information.” I then put the screen that I took off back on to the phone and the message still remained. I didn’t touch from camera/ Face ID at all and I’m very confused. Since I’ve done iPhone 11 screen replacement’s numerous amount of times and never had this problem. I even updated the phone and it didn’t work. I also transferred the data of the screen. So I don’t know why this occurred.

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hello Joshua,

When you replace the screen, you getting out the screen sensors assembly with the front (left channel) speaker. Check whether there was any damage when unfastening/inserting the tape. Sometimes, when removing the assembly from a damaged screen (especially a flooded one), the connections break. However, start by diagnosing where the problem is: in the sensor assembly I mentioned above or in the Thrue.Depth assembly (a set of two front cameras and a dot projector). It's pretty easy to tell the difference, a lot depends on it.

Finally (it may seem funny but it happens quite often) check if the connectors of both sets of sensors have been properly snapped into its ports :-) If even one signal is absent, Face.ID will not work at all.

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