When you take out your Xiaomi or Redmi to capture a moment of importance, and instead of the viewfinder, you see a black screen or the app just closes, it's a familiar experience for many users. This is annoying, especially if it's a rare event. But don't panic, because in most cases, the problem is not physical damage to the matrix, but a software failure or conflict of resources of the MIUI system.
The main reason is that the camera module is one of the most resource-intensive components of a smartphone. It requires synchronous processor, RAM and specific drivers. If some background process has "captured" access to the lens or there was a failure in the data buffer, you will encounter an error. Software failure is the most common culprit, which is easily eliminated by rebooting or cleaning the cache.
However, if the camera stopped focusing or taking pictures after the device fell or moisture hit, the situation could be more serious, and in this article we will examine all possible causes, from simple bugs to hardware malfunctions, and offer step-by-step instructions for restoring the health of your device.
⚠️ Warning: If your phone has recently fallen or got wet, don't try to disassemble it yourself. moisture could have caused a short circuit on the camera plume, and re-energizing can permanently disable the module.
Software crashes and app freezes
The most common but common cause is a temporary malfunction of the operating system. Android, which runs MIUI, sometimes misallocates resources. The camera app could simply "hang" in the background, trying to process the previous picture or video stream, in which case the viewfinder remains black, and the control buttons do not respond to presses.
Often, the problem is solved by forcefully stopping the process, so you have to go to the system settings, find the application section, and select Camera, and you have to press the Stop or Close button, and this action will force the process to unload from memory, resetting the accumulated errors, and then try to start the application again.
Also worth noting is the availability of system updates. Xiaomi engineers regularly release patches that fix compatibility bugs with various camera modules. If you have an older version of the firmware installed, a driver conflict is quite likely. Check for updates in the Settings menu → About the phone → MIUI version.
- 📱 Reboot: Fully switching off and on the smartphone resets all temporary processes.
- 🧹 Cache Clearing: Delete temporary application files through settings.
- 🔄 Update: Install the latest available version MIUI.
⚠️ Note: Do not manually delete system files through the file manager unless you are sure of their purpose.
Camera Access Conflict with Other Applications
One of the specific features of Android is that you limit access to the camera to just one active app. If you run a video call on Telegram, WhatsApp or Skype, and then you try to open a standard camera app, you get a black screen or an error.
Check the list of apps you've run. Maybe some messenger or social network (like Instagram or TikTok) has been left hanging in the background and holding the camera capture. Close all apps through Task Manager and try to take photos again. This is especially true for devices with a small amount of RAM, where background processes are not automatically offloaded.
It could also be a third-party camera app you installed from Play Market, some of which are poorly optimized for specific Poco or Redmi models, if you have a problem after installing the software, uninstall it and check the regular app, and in rare cases, malware can block access to the camera for "security" or surveillance purposes.
To diagnose, try running the camera in safe mode, which will determine if the third-party application is to blame, and if the camera is running in safe mode, then some software you have installed is in conflict.
Problems with permissions and privacy settings
Modern versions of MIUI and Android have enhanced security measures. The app may not work if it simply doesn't have permission to access the camera. This often happens after a system update or reset. Check if you've accidentally blocked access in the privacy menu.
Go to Settings → Apps → All Apps → Camera → Permissions. Make sure the switch is in the Allow position. If it is “Disallow” or “Ask”, the application will not be able to activate the module. A similar procedure should be done if the camera in a particular application, such as Viber, does not work.
Another important aspect is the Privacy Protection mode. MIUI 12 and later has a feature that can block access to the camera for all applications if the appropriate switch is turned on in the notification curtain. Check the control center: there may be a camera lock indicator on.
| Type of permit | Status | Impact on work |
|---|---|---|
| Camera. | Permitted. | Necessary for the survey |
| Microphone | Permitted. | I need it for sound video. |
| Geoposition | Optionally. | Needs tags in the photo. |
| Memory. | Permitted. | You need to save files |
Memory shortage and storage overflow
High-quality photos and videos in 4K require a significant amount of free space. If your Xiaomi internal memory is 95-99% full, the camera may fail. The system simply has nowhere to buffer the image before saving, and the application crashes.
Clean up the storage of unnecessary files, delete old videos, unneeded apps, or transfer photos to your computer or the cloud, and especially critical is the lack of memory when shooting high-resolution video, as the data flow is continuous and requires fast free space.
Also check if the gallery cache is full.Sometimes the gallery can't index new photos, which creates the illusion of a camera problem.Use the built-in Cleanup utility in the security menu to remove debris.
- 🗑️ File Deletion: Free up at least 1-2 GB space.
- ☁️ Cloud Services: Enable sync with Google Photos or Mi Cloud.
- 📂 Data Transfer: Move large files to SD-card.
☑️ Memory cleanup for the camera
Hardware damage and physical defects
If the software didn't work, there's a high probability of a physical malfunction, the camera module is a fragile component, and even if the glass is intact, the plume could have moved or the stabilizer could have broken, often after a fall, even from a low altitude, if the phone fell to a corner.
Symptoms of hardware failure can be different: the camera focuses, but the photo is black; you can hear a crack or buzz when you try to focus (optical stabilization malfunction); or the module is not detected at all by the system.
Also worth checking is the purity of the lenses. Fat spots, dust or protective film covering the lens can create the illusion of a breakage. The camera will "think" that the frame is dark, and automatically darken the image. Wipe the area of the cameras with soft cloth.
⚠️ Warning: If you hear mechanical knocking or vibration when you turn on the camera, this is a sign of failure of the optical stabilization module (OIS). Operation in this state can lead to complete failure.
Resetting and extreme measures
When nothing works, the radical method is to reset all settings to factory settings, which will delete all your data, contacts and apps, returning your phone to the “out of the box” state.
Reset allows you to exclude any software conflicts, registry errors and the consequences of viruses. If after a full reset (Hard Reset) the camera on Xiaomi still does not work, then with a probability of 99% the problem lies in the hardware.
To perform the reset, go to Settings → About Phone → Settings Reset → Erase all data. The process will take a few minutes, after which the phone will restart. Check the camera immediately before installing all the apps to see if it's working.
Diagnostic test and contact with the service
Xiaomi smartphones have a built-in engineering menu to check components. You can run a camera test to see a technical error. Enter the code ##6484## in the dialer (CIT engineering menu). Select Camera and check all lenses (wide-angle, TV, macro).
If the camera is also out of service or has an error on the engineering menu, it's a direct route to the service center. Self-repairing camera modules in modern smartphones is difficult due to the dense layout and the presence of protective seals.
Don't delay a visit to specialists if the phone is warranty-free. Attempting to repair yourself can lead to loss of warranty service. Professionals will diagnose the plumes, replace the module or restore contacts.