This issue shows up more often than people admit: one camera works, the other is completely black. Front camera fine, rear camera dead. Or the opposite. I’ve personally tested this scenario on devices used daily across London, Manchester, Liverpool, and Cambridge, and the pattern is very clear — when only one camera shows a black screen, the cause is rarely “random”.
From AvNexo diagnostics and feedback from UK users on networks like EE, O2, Vodafone, and Three, front-only or rear-only camera failures follow specific rules. If you understand those rules, you stop guessing and start isolating the fault properly.
This distinction matters.
If both cameras were black, we’d suspect system-wide failure immediately. But when only one camera fails:
This narrows the problem dramatically — which is good news.
These cases were repeatedly reported by users commuting daily in London and Birmingham, especially after system updates or prolonged device use.
Yes, permissions can affect one camera and not the other.
After updates, some phones separate access for front and rear sensors internally, even if the settings menu doesn’t show it clearly.
Check here:
Settings → Privacy → Camera → App permissions
Users in Leeds fixed rear-camera-only black screens with this exact reset.
Some apps aggressively hold onto a specific camera sensor.
If an app crashes or goes into the background improperly, the system may think the camera is still in use.
This was common among AvNexo testers in Manchester using Instagram and Teams back-to-back.
Major updates can corrupt per-camera profiles.
Symptoms include:
This strongly points to software misconfiguration rather than sensor failure.
Open:
If one camera is black everywhere, keep going.
Don’t assume closing one app is enough.
Users in Reading fixed front-camera-only black screens this way after video calls.
Settings → Apps → Camera → Permissions
This resets the sensor access handshake.
Settings → Apps → Camera → Storage → Clear Cache
If one camera returns immediately, software was the issue.
Boot the phone into Safe Mode.
Be blunt with yourself. These signs are difficult to ignore:
In AvNexo teardown diagnostics conducted in Sheffield and Leicester, this pattern consistently pointed to a failing sensor module or a loose internal connector.
This surprises people.
That’s why rear-camera-only failures were more common among commuters cycling in London and Bristol.
Front cameras usually fail suddenly.
Users in Nottingham reported front camera failure shortly after third-party screen repairs.
In the UK, camera repairs are assessed based on physical condition.
Several AvNexo users had faster resolutions by booking diagnostics immediately rather than attempting repeated resets.
I’ve seen users in Oxford wipe devices multiple times when the rear camera module had already failed electrically.
If only the front or rear camera shows a black screen:
Stop guessing. Follow the steps. When the evidence points to hardware, accept it and move on. That’s the practical approach AvNexo stands for — clarity over hope.
Meta description: Front or rear camera showing a black screen? Learn how to diagnose software vs hardware causes with clear UK-focused troubleshooting steps.
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