Your iPhone still turns on after a drop, but Measure cannot detect a wall, room-scanning apps fail, or the rear camera starts hunting for focus. When the iPhone LiDAR scanner is not working, the damage can be easy to miss because the small sensor sits beside the cameras, not on the front of the phone.
The fault may come from a software glitch, a case or lens protector, a loose camera connection, or a damaged LiDAR module. We can usually narrow it down with a few safe checks before deciding whether the phone needs a repair.
Key Takeaways
- LiDAR faults after a drop often affect Measure, augmented reality apps and low-light focusing.
- Test the camera, Measure and another AR app before assuming the scanner itself has failed.
- A cracked rear panel, bent housing or camera fault can affect LiDAR even when the sensor looks intact.
- Avoid opening the phone or pressing the sensor area, as this can cause more damage.
- Professional testing gives you a clearer repair cost than replacing parts by guesswork.
What the iPhone LiDAR scanner does
LiDAR is available on selected Pro and Pro Max iPhones, including the iPhone 12 Pro range and newer Pro models. The scanner measures distance by sending out light pulses and reading how quickly they return. Your phone then uses that depth information to understand nearby surfaces and objects.
That sounds rather futuristic, but the everyday uses are simple. LiDAR helps the Measure app judge distance, improves some augmented reality experiences and supports faster focusing in low light. It can also help certain camera features understand depth.
Apple’s information about augmented reality on iPhone gives more background on how depth and camera data work together. You don’t need to understand the technical side to diagnose a fault, though. The important point is that LiDAR is part of a group of rear sensors, so a drop can affect more than one function.
Typical symptoms include:
- Measure shows no detected surface or gives wildly inconsistent readings.
- Furniture or other objects appear in the wrong position in an AR app.
- Room-scanning apps stop halfway through a scan.
- Rear-camera focusing becomes slow, especially in dim rooms.
- The Camera app shows a black image or repeatedly switches between lenses.
- A case, glass protector or cracked rear panel sits over the sensor area.
One failed app doesn’t prove that the hardware is damaged. If every depth-related feature stopped after the same impact, we take the physical side more seriously.
Safe checks when LiDAR stops working
Start with the outside of the phone. Remove the case and any camera lens protector, then clean the rear camera glass with a soft, dry microfibre cloth. Do not spray cleaner directly onto the phone. A protector that has shifted by a millimetre can interfere with the sensor window.
Next, test the phone in a well-lit room. Open the Camera app and try the rear camera at different zoom levels. Then open Measure and point the phone towards a clear floor, wall or table. Measure isn’t a precision surveying tool, so small variations are normal. A complete refusal to detect surfaces is more useful than a reading that is a few centimetres out.
Now try another AR app that you already trust. If Measure fails but the other app works, the problem may sit with the app or its permissions. Check Settings > Privacy & Security > Camera, then confirm that the affected app has camera access. Update the app and iOS if an update is available.
Restart the iPhone before trying more complicated fixes. If it still behaves oddly, use a force restart:
- Press and quickly release Volume Up.
- Press and quickly release Volume Down.
- Hold the Side button until the Apple logo appears.
The button sequence applies to Face ID iPhones. Keep holding the Side button if the screen briefly goes black.
Apple’s camera troubleshooting steps are also useful when the rear camera has become unreliable after an impact. If the camera image remains black, the flash stops working or several camera modes fail, don’t treat it as a LiDAR-only problem.
If the fault began immediately after the drop and affects more than one rear-camera feature, software resets are unlikely to repair the damaged part.
Why a drop can affect LiDAR
The LiDAR sensor is small, but it is mounted in a tightly packed camera area. A hard impact can shift a connector, damage the sensor housing or bend the frame around the rear camera assembly. The phone may look fine from the front while the sensor has taken the force directly.
A cracked back glass can cause trouble too. Fine cracks may sit across the camera window, while loose glass can allow dust or moisture inside. Once the original seals are compromised, even a later splash can lead to corrosion around the camera and sensor connections.
The rear camera assembly may also be the real cause. On some phones, a damaged camera module can create focusing problems that make LiDAR appear faulty. If the camera goes black, shakes, refuses to focus or displays a warning about an unknown part, we test the camera hardware alongside LiDAR.
A slightly bent chassis can create pressure around the camera bracket. This matters because replacement parts need to sit flat and connect properly. Trying to straighten the frame by hand can crack the rear glass or put pressure on the battery, so we don’t recommend it.
At the repair bench, we inspect:
- The camera glass and LiDAR window for cracks or obstruction.
- The frame around the camera cluster for dents and pressure points.
- Camera and sensor connections inside the phone.
- Rear-camera operation, focusing and flash behaviour.
- Signs of liquid entry or corrosion.
- Whether the fault affects one app or the whole depth-sensing system.
When your iPhone needs a LiDAR repair
Book a proper inspection if the scanner fails in Measure and several AR apps after the drop. The same applies when the rear camera has developed a black screen, poor focus or shaking image. Those symptoms suggest wider camera-area damage rather than a harmless app glitch.
We don’t recommend opening the phone at home. The back glass and display are bonded, and the inside contains delicate flex cables and small connectors. A metal tool can short a component or damage the cable that links the camera assembly to the logic board. Heat can soften adhesive, warp the housing and affect nearby parts.
Back up your iPhone before sending it for testing. If the display and touch still work, use iCloud or a computer backup. Remove your passcode only when a repairer genuinely needs it, and ask how it will be handled. We advise customers to keep sensitive information off the phone where possible.
If the phone also has a smashed display, arrange the work together. Searching for cracked iPhone screen repair often starts with the obvious damage, but the same impact can affect the cameras, charging port and frame. Our iPhone screen repair UK service can assess those related faults instead of treating the glass in isolation.
A screen replacement won’t fix a failed LiDAR module on its own. However, repairing both faults in one visit may avoid repeated handling and give the technician a clearer view of the impact damage.
UK repair costs and when replacement makes sense
LiDAR repairs don’t have one standard price. The cost depends on the iPhone model, whether the sensor is available separately, and whether the camera assembly, frame or logic board also needs attention. We provide a confirmed quote after testing rather than guessing from a symptom.
For general context, common iPhone jobs often fall within these guide ranges:
| Repair type | Typical guide price |
|---|---|
| iPhone screen replacement | £60 to £180 |
| iPhone battery replacement | £40 to £80 |
| Charging port repair | £50 to £90 |
| Water-damage treatment | £60 to £120 |
These figures don’t price a LiDAR repair. A camera-area fault may need a different part and more testing. A phone repair Essex appointment in Harlow can be arranged, while customers elsewhere can use our postal service.
Repair usually makes sense when the phone has a healthy battery, a straight frame and one clear sensor fault. Replacement becomes more sensible when the handset has a badly bent housing, heavy corrosion, a failing battery and several damaged assemblies.
For example, an iPhone 13 Pro with a working display and one failed depth sensor may be a sensible repair. An older phone with a cracked back, weak battery and unreliable camera needs a proper cost comparison first. Our iPhone battery replacement UK service can be included in that assessment if battery health has also dropped.
How our UK postal repair service works
We repair iPhones in Essex and accept devices from customers across the country. Our postal phone repair UK process starts with an online booking. Pack the phone securely, include the order number and provide any passcode needed for testing. Remove SIM cards and accessories unless we have asked for them.
When the device arrives, we inspect the camera area, run diagnostic tests and check for related impact damage. We aim to begin quickly, often on the same day the phone reaches us, although complex faults can take longer. We contact you with the repair cost before chargeable work starts.
We use quality replacement parts, offer a price promise where possible and provide repair warranty cover under the relevant terms. After testing, we return the phone using tracked delivery. We also handle wider mobile phone repair UK work, including charging ports, screens, batteries and water-damage diagnostics.
Our main focus is iPhone and Samsung work, so customers searching for Samsung phone repair UK can also speak to the same team about other handset faults.
Common questions about LiDAR faults
Can an iPhone update fix LiDAR?
It can fix an app or iOS problem, but it won’t repair a damaged sensor, connector or camera assembly. Update and restart the phone first, then test several apps.
Does LiDAR work through a screen protector?
A front screen protector won’t affect the rear LiDAR scanner. A camera lens protector or case that covers the rear sensor area can interfere with readings.
Will repairing LiDAR delete my photos?
A sensor or camera repair should not erase your data. We still recommend a backup because any repair carries a small risk, particularly when the phone has impact or liquid damage.
Can Apple repair a dropped LiDAR scanner?
Apple provides official repair routes, although accidental damage may fall outside a standard warranty. You can check Apple’s official iPhone repair options before choosing a local or postal repair provider.
Conclusion
When an iPhone LiDAR scanner is not working after a drop, remove the case, clean the rear camera glass, restart the phone and test Measure alongside another AR app. If the camera, focus or depth features all fail, the impact probably reached the sensor assembly or its connections.
We can test the phone properly before recommending a part. That is safer than repeated resets or opening the handset at home, and it gives you a clearer choice between repair and replacement.
If your iPhone has stopped measuring rooms today, book a repair online or contact our team for a quote. We aim to get the device working again without adding unnecessary work.
James Waterston, Device Repair Specialist at Repair My Crack