You tap the camera icon, the shutter button appears, the screen stays black. Sometimes the app takes a photo anyway and you get a black rectangle in your gallery. Sometimes it freezes entirely. It is one of the more alarming phone faults because it looks like hardware has died, but in the large majority of cases the sensor is fine and something in software is holding onto the camera.
The short answer
A black camera preview is almost always another app holding the camera feed, a cached camera service that has crashed, or a permission that got revoked. Force-stop the camera app, clear its cache, restart the phone, and check which other apps have camera permission. Only if the preview is still black in safe mode is the hardware suspect.
Why the preview goes black
Only one app can own the camera sensor at a time. Your phone hands that ownership out and takes it back constantly as you switch between apps. When the hand-off fails, the camera app gets a valid session with no video frames in it, which renders as pure black. The four common causes:
- Another app is still holding the sensor. Video calling apps are the worst offenders. If a call ended badly or the app was killed mid-stream, it can keep its claim on the camera until the phone restarts.
- The camera service crashed. The background process that brokers camera access can fall over on its own, usually after an update or a long stretch without a reboot.
- A permission was revoked. Android in particular will auto-revoke permissions for apps you have not opened in a few months, and some privacy tools revoke camera access deliberately.
- Cached data is corrupt. The camera app stores its last-used settings, and a bad write can leave it trying to start in a mode the sensor does not support.
A useful test before you do anything else: open a completely different camera app. If the preview works there, the sensor is healthy and the problem is confined to one app. If every camera app is black, the fault is in the camera service or the hardware.
Work through these in order
Close every app, then force-stop the camera
Swipe away everything in the recent apps view. Then go into your settings, find the camera app in the app list, and use Force stop rather than just closing it. Force stop releases any hardware claim the app is holding. Reopen the camera and check.
Restart the phone properly
A restart clears every camera claim at once, which is why it fixes this so often. Do a full power off and power on rather than a quick lock and unlock. Give it thirty seconds off before powering back up.
Clear the camera app cache
In the camera app settings, find Storage and choose Clear cache. This deletes temporary files without touching your photos. Avoid Clear data on the first pass, since that resets all your camera preferences. If clearing the cache does not help, come back and clear data too.
Check camera permission
Open the camera app permissions and confirm camera access is allowed. If it says the permission was removed because the app was unused, grant it again. Do the same for any third-party camera app you rely on.
Look for apps holding the sensor
Go through your permission manager and list every app with camera access. Video calling, screen recording, barcode scanners and parental control apps are the usual culprits. Force-stop the ones you are not using right now, then try the camera again.
Boot into safe mode
Safe mode loads the phone with third-party apps disabled. On most Android phones you hold the power button, then long-press Power off until a safe mode prompt appears. If the camera works in safe mode, a downloaded app is the cause and you can uninstall recent additions one at a time to find it.
Install every pending update
Update the camera app, the system software, and anything from your phone maker that handles the camera pipeline. Black preview bugs have shipped in real updates and have been fixed in the next one.
Cover and uncover the sensor
Sounds silly, works more often than it should. Some phones auto-switch between lenses and can get stuck deciding. Cover the rear lens with your finger for a few seconds, switch to the front camera and back, and watch for the preview waking up.
If the preview is still black
At this point you have ruled out the software causes that account for the large majority of cases. What is left:
A physical obstruction
Check that a case, a magnetic mount, a screen protector or a stray piece of lens film is not sitting over the camera. A thick case with a slightly misaligned cut-out will produce a very dark image rather than a pure black one, so look for a faint outline rather than nothing at all.
A disconnected or damaged ribbon cable
If the phone has been dropped, the camera module connector can work loose. The tell here is that the black preview appeared immediately after an impact, and that the camera fails identically in safe mode and in every app. This is a repair, not a settings change.
Water damage
Moisture behind the lens fogs the image before it kills it outright, so you would usually see a hazy or milky preview first. If the phone has been wet at any point in the last few weeks, mention it to whoever repairs it.
Before you hand the phone to a repair shop or start a warranty claim, back up your photos. Camera module repairs sometimes involve a factory reset, and nobody will warn you in advance.
Stopping it happening again
- Restart the phone once a week. It costs a minute and clears every stuck hardware claim.
- Close video calling apps properly rather than swiping them away mid-call.
- Keep ten percent of your storage free. A full phone makes camera writes fail in odd ways.
- Be sparing with apps that want camera permission and do not obviously need it.
Why does my camera work in some apps but not others?
That points at the app rather than the phone. The failing app either lost its camera permission or is trying to open the sensor in a mode it does not support. Clear that app cache and check its permissions.
Will clearing camera data delete my photos?
No. Photos live in your gallery storage, not inside the camera app. Clearing cache or data resets camera settings only.
The front camera works but the rear one is black. What does that mean?
One working lens proves the camera service and permissions are fine, which points strongly at the rear module or its connector. Try safe mode first, then treat it as a hardware fault.
Can a software update cause this?
Yes, and it is common enough that it is worth checking the update history. If the black screen started the day an update installed, look for a follow-up patch before assuming hardware.
Is a factory reset worth trying?
Only as a last step before a repair, and only after a full backup. If the camera is still black after a reset, the fault is hardware and a reset has cost you time for nothing.
The bottom line
A black camera preview looks like a dead sensor and almost never is. Force-stop, restart, clear the cache and check permissions, in that order, and you will fix most cases inside five minutes. Safe mode is the dividing line: if the camera works there, keep hunting for the app that is to blame. If it is black in safe mode too, stop troubleshooting and get the module looked at.
