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TrueDepth diagnosisiPhone cameras & sensors

Face ID stopped working after a drop, cracked screen, or repair

By Samuel — owner & device repair technician · Published

First rule out the things that imitate damage. Then use the timing, camera behavior, exact warning, and repair history to decide whether the TrueDepth system needs service.

Direct answer: Remove any case or screen protector covering the top sensors, clean that area, restart the iPhone, check Face ID settings, and try Reset Face ID. If setup cannot complete, the front camera is abnormal, or the failure began immediately after impact or repair, stop resetting and arrange a TrueDepth diagnosis.
Cracked iPhone front glass near the camera and Face ID sensor area
TrueDepth areaA screen can still display normally while impact affects the sensor system above it.

Face ID is not a single selfie camera. The TrueDepth system uses multiple components, controlled illumination, depth sensing, alignment, software, and security calibration. That is why “the front camera still takes photos” does not rule out a Face ID hardware problem—and why guessing at one sensor is not a reliable repair plan.

Five safe checks before assuming damage

  1. Expose the sensor area. Remove the case and screen protector, especially if either overlaps the Dynamic Island or notch.
  2. Clean the front glass. Use a clean, dry microfiber cloth. Oil, dust, and cracked protector edges can obstruct the TrueDepth view.
  3. Check settings. Open Settings → Face ID & Passcode and confirm Face ID is set up for the feature you are trying to use.
  4. Restart and enter the passcode. Face ID normally requires the passcode after a restart before it resumes.
  5. Reset Face ID once. In Face ID & Passcode, choose Reset Face ID, then attempt setup again in normal lighting with the phone roughly an arm’s length or closer.

If setup completes and recognition returns, the issue was likely obstruction, positioning, configuration, or a temporary software state. If setup cannot see your face, repeatedly says to move higher or lower, or reports that Face ID is unavailable, the failure is more specific.

The exact behavior narrows the cause

“Face ID is not available”Restart once and check for an iOS update. If it persists—especially after impact—hardware or calibration needs assessment.
“A problem was detected with the TrueDepth Camera”This is not a dirty-glass message. Apple’s diagnostics have identified a TrueDepth issue; service is appropriate.
Setup circle never completesObstruction, positioning, sensor visibility, alignment, or a component fault can prevent the depth map from completing.
Works intermittentlyCheck the protector and front glass first. Intermittence after a drop can also come from damaged alignment, a connection, or progressive impact damage.
Selfie camera is blurry or blackThe front-camera problem may be part of the same impact or repair event. Document every affected function rather than reporting only Face ID.

If it failed after a drop

A drop can crack glass over the sensor area, bend the frame, shift or damage internal assemblies, loosen a connection, or damage the TrueDepth system without leaving obvious exterior damage. Test and record:

  • Front-camera photo and video focus
  • Portrait mode and depth effects
  • Proximity behavior during a phone call
  • Whether the display turns off correctly at your ear
  • Any crack, black spot, bright line, or lifted glass near the top of the display
  • The exact Face ID message and whether a new setup can begin
Do not press on a cracked sensor area. Pressure can turn stable glass damage into display, camera, or cable damage.

If it failed immediately after a screen or camera repair

A normal screen replacement does not automatically mean Face ID must stop working. The timing is important, though. Contact the repairer promptly and explain whether Face ID worked immediately before the repair.

01
Check Parts and Service History

On supported models and iOS versions, open Settings → General → About. Look for Display, TrueDepth Camera, Front Camera, Genuine, Used, Unknown, or Finish Repair messages.

02
Finish Repair is actionable

On supported devices and parts, Repair Assistant completes calibration. Apple says Face ID may remain unavailable until calibration is finished.

03
An Unknown or Issue message is evidence, not the whole diagnosis

It can mean a nongenuine, previously used, malfunctioning, unverified, or incompletely calibrated part depending on model and iOS version.

04
No message does not prove no damage

Parts-history coverage varies by iPhone model. A physical or connection fault can still exist.

Why this is not a good trial-and-error DIY repair

The TrueDepth system supports identity, payments, health information, and app authentication. Apple states that only a trained technician should service it and warns that improper repair or modification of its laser systems can defeat safety mechanisms and risk injury.

Randomly replacing front components can add calibration problems without fixing the original fault. A useful diagnosis begins with the model, history, warning, camera tests, and parts history; then it follows the manufacturer-supported service path for that device.

Arrange service when

  • Face ID setup cannot complete after the safe checks
  • The iPhone reports a TrueDepth camera problem
  • The front camera is black, blurry, unstable, or abnormal
  • The top of the display is cracked, lifted, or pressure-damaged
  • The problem began immediately after a drop, liquid exposure, or repair
  • Parts and Service History shows Finish Repair, Unknown, or an Issue for the relevant part

What to send for diagnosis

  • Exact iPhone model and iOS version
  • The exact Face ID message or a screenshot
  • Whether a new Face ID setup starts or fails
  • Front-camera and Portrait-mode behavior
  • Drop, liquid, and repair history—including when Face ID last worked
  • Screenshot of Parts and Service History, if present
Face ID failed right after impact or repair?

Send the model, exact warning, front-camera behavior, and repair history.

Text the evidence

FAQ

Can a screen protector stop Face ID?

Yes, if it is dirty, damaged, poorly aligned, or covers the TrueDepth area. Remove it as a test rather than assuming an internal failure.

Will resetting Face ID erase anything else?

No. It removes the saved Face ID appearance so you can enroll again. It does not erase the phone.

Can water damage Face ID?

Yes. Liquid and corrosion can affect the front sensor system or its connections. Do not charge or repeatedly test a wet phone.

Why does it ask for my passcode even when Face ID works?

That can be normal after restarting, after certain security events, or after multiple failed recognition attempts. A passcode request alone does not prove Face ID is broken.

Sources and notes

This guide distinguishes user checks from trained service. It does not identify a failed TrueDepth component remotely.