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A comment on Face ID stops working if you replace the iPhone 13 screen with 3rd-party repair. Parent comment

Re:Face ID stops working if you replace the iPhone 13 screen... by zsmi on Sunday September 26, 2021 @03:38PM (#28663927)
From the article we know they are not checksumming all hardware agains the original device as they were able to change some assemblies. Really what this means is the sensor assembly moved into the screen assembly [1] and the youtuber didn't investigate further.

If the sensor changes this breaks the chain of trust for FaceID [2] and you want the system to stop working because someone, for good or bad, is tampering with it.

[1] https://www.ifixit.com/Teardown/iPhone+13+Pro+Teardown/14492... See step 3. Note, the screen and sensor assembly might not necessarily be bound together.

[2] https://manuals.info.apple.com/MANUALS/1000/MA1902/en_US/app...

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Re:Face ID stops working if you replace the iPhone 13 screen... by judge2020 on Sunday September 26, 2021 @04:18PM (#28664271)
From step 4's second image[0], three of the components (maybe dot projector, IR, and Camera) are in the main housing. The YouTuber shows that Face ID works even if the 'sensor assembly' is unplugged[1].

0: https://guide-images.cdn.ifixit.com/igi/QtDRKJPM5CKm31ki.hug...

1: https://news.ycombinator.com/item?id=28663852

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