Three cameras, three different rules
An iPhone from the X onwards has a rear camera module, a front camera and, in the same notch or island, the TrueDepth system that runs Face ID. They look like one assembly but behave very differently after a repair. The rear camera is a straightforward swap with a pairing note on newer models. The front camera is replaceable but shares a flex with Face ID parts on many models. The TrueDepth sensors themselves are paired to the logic board and cannot be replaced with a new part by a shop. Knowing which of the three you are touching decides the quote.
Rear camera
Rear cameras are modules on a short flex held by a bracket. On iPhone 7 to 11 the swap is unremarkable: new module, bracket, test, close. From iPhone 12 the rear camera is in the Parts and Service History list, so an unpaired module shows the Unknown Part note described in our Unknown Part guide. On iPhone 12 and 13 an unpaired module can also lose some software features such as portrait lighting effects while the camera itself works. An original module pulled from the same model can be calibrated by Repair Assistant on iPhone 14 and newer, after which the note reads Used.
What to check before ordering: module versions differ between regular, Pro and Pro Max within a generation, and sometimes between colour variants of the lens cover. Match the exact model from the iPhone parts catalogue, and replace the rear camera lens glass in the same visit if it is cracked; glass dust on the sensor is the usual reason a new module shows spots.
Front camera
On iPhone X to 11 the front camera, flood illuminator and proximity sensor sit on one flex, and the dot projector and infrared camera on another. Replacing the front camera flex here keeps Face ID if the second flex is untouched. From iPhone 12 the layout is denser and on iPhone 13 and newer the front camera and the infrared camera are physically combined in one module. Replacing that module replaces an infrared camera that is paired to the board, and Face ID stops working. There is no programmer write that fixes this; the pairing is on the board side.
Honest advice at the counter: on iPhone 13 and newer, a front camera job that is only about selfies has a high chance of ending Face ID, and the customer must accept that in writing before you start. The alternative is microsoldering: moving the original infrared camera or the original flex components onto the new part under a microscope, which specialist board shops offer.
Face ID: what breaks it and what does not
| Action | Face ID after |
|---|---|
| Screen replacement, earpiece and sensor flex transferred from old screen | Works |
| Screen replacement, new earpiece and sensor flex installed | Fails on most models; the flood illuminator is on that flex |
| Rear camera replacement | Works |
| Front camera replacement, X to 12 | Usually works if the dot projector flex is untouched |
| Front camera replacement, 13 and newer | Fails unless original infrared camera is transferred |
| Dot projector damaged or replaced | Fails; needs board-level repair of the projector flex |
| Battery, port, speaker, housing, back glass | Works |
The earpiece speaker and sensor flex is the part most often damaged during screen work. Transfer it carefully, keep its small gaskets, and never apply heat to it. Our screen listings state when a replacement earpiece flex is included so you can decide whether to use it; the safe habit is to transfer the original every time. See how to replace an iPhone screen.
Dot projector repair in brief
The dot projector is a tiny laser module on the same flex as the infrared camera on older models. If the projector dies, the phone shows «Face ID is not available» or «Move iPhone a little lower or higher» during setup. Specialist shops replace the projector itself under a microscope and use a JCID dot projector adaptor to read the calibration from the old flex and write it to the new one. The adaptor supports iPhone X through 15 Pro Max. This is a multi-hour job with a real failure rate; price it that way or send it out.
Testing before you close the phone
- With the screen connected but not glued, boot the phone and open Camera. Switch rear and front, check focus, flash and all lenses on Pro models.
- Go to Settings, Face ID and Passcode, and run Set Up Face ID. If the setup screen never shows the moving face outline, the TrueDepth system is not seen.
- Check the proximity sensor with a call: the screen should go dark when covered.
- Check the ambient light sensor by covering the top of the screen with auto-brightness on.
Only then apply adhesive. A programmer such as the JCID V1SE can read whether the dot projector responds before you quote; see our JCID guide.
Safety note
The dot projector is a Class 1 laser product in normal use, but a damaged module can emit outside its rated pattern. Do not look into the projector with a magnifier while the phone is powered. Disconnect the battery before unplugging any front sensor flex; these connectors are the smallest on the board and a live short damages the flex and sometimes the board.
FAQ
Can I replace the front camera on an iPhone 14 and keep Face ID?
Only by transferring the original infrared camera to the new flex under a microscope. A plain swap ends Face ID.
Why does Face ID fail after a screen replacement?
Almost always the earpiece and sensor flex: either a new one was fitted instead of the original, or the original was torn or had its flood illuminator damaged during transfer.
Does a rear camera replacement affect Face ID?
No. It can produce an Unknown Part note on iPhone 12 and newer, but Face ID is unrelated.
Can a programmer fix Face ID?
Programmers transfer dot projector calibration during a projector repair. They cannot pair a new infrared camera or a new projector to the board.