Is it possible replace Face ID parts?
Touch ID does not work when iPhone's home button parts replaced. Face ID parts is same? What do you think of that?
发售于2017年11月3日。型号为 A1865, A1901。有 GSM 或者 CDMA 网络制式可选。提供64或者256GB 的存储空间。提供银色和深空灰色。（读音与“iPhone 10”相同）
"The TrueDepth camera system incorporates tamper-detection features. If tampering is detected, the system may be disabled for safety reasons."
It's official now, Apple acknowledges that the Face ID system is boobytrapped.
Don't know how exactly, however it may be due to security that the data does not get stolen, or safety, that exposed IR beam power stays below regulation limit when the device has been disassembled, or Apple just wants to mess with people.
I have done much testing on this manner. there are two pieces to this puzzle that make this an impossible task and a warning for future screen replacements. the two pieces that are matched (excuse my lack of true tech verbiage). the two pieces that are married together are the front camera module and the front ear piece flex from the lcd itself. any change to these two will render the face id useless. not a hard wipe or a complete reinstall of ios will fix this. treat these two pieces as careful as you would an home button on the i6 and up. make a mistake and there is no turning back. on a side note: turns out that every single lcd for iphone 8, 8+, and x has their own SPECIFIC brightness file stored inside the lcd chip itself. change the screen (either using a actual lcd off another device, replacing with oem product or aftermarket lcd and the brightness will always be dimmer. nothing you could do to fix that if you throw away and misplace the original screen that was there in the first place. they do sell machines that can copy the files from the original lcd so it can be transferred to new screen. but I have yet to see them work reliably.