Why Face ID Stops Working After a Screen Repair (And How We Fix It)

We see this a lot: someone had a screen repair done somewhere cheap, and Face ID stopped working afterwards. It isn't random bad luck — it's a specific, well-understood mistake, and it's avoidable.

What Face ID actually relies on

Face ID isn't part of the screen itself — it's a small cluster of components at the top of the phone called the True Depth camera system: an infrared camera, a dot projector that maps your face in 3D, a flood illuminator, and a proximity sensor. On most iPhone models with Face ID, some of these components are technically attached to the screen assembly and need to be carefully moved across to the new screen during a repair, not simply left behind with the old one.

Where it goes wrong

A rushed or inexperienced repair can damage the tiny flex cables connecting these sensors during the transfer, or fail to reconnect them correctly. Apple's own genuine parts pairing system also means that on newer models, a screen swapped without the right calibration process can trigger a warning that the screen is "unable to verify this iPhone has a genuine Apple display" — and on some models, that can affect True Tone and Face ID functionality together.

The two most common outcomes of a bad repair

• Face ID stops working entirely, usually from a damaged or disconnected flex cable during the sensor transfer.
• Face ID works but feels less reliable — failing more often in normal lighting than it used to — often a sign the sensor components weren't seated or aligned quite correctly.

How we do it properly

When we replace a screen on a Face ID iPhone, transferring the True Depth components across correctly is treated as part of the repair, not an optional extra. We test Face ID before you leave, every time — not just that the screen lights up and responds to touch, but that Face ID itself genuinely still works. If it doesn't, we don't consider the job finished.

If yours has already stopped working

If you've had a repair elsewhere and Face ID has stopped working since, bring it in. In many cases it's a case of correctly reconnecting or reseating what was disturbed the first time round, and we'll tell you honestly what we find before any further work.