Xiaomi’s smartphones, including Redmi and POCO, are famous for their clever MIUI and HyperOS shell interfaces, but even experienced users sometimes have difficulties with basic multimedia functions. Often, the “how to turn on the camera” query is not due to physical failure, but due to software restrictions, access locks or specific energy saving settings that aggressively “freeze” the background processes. Understanding the logic of Android security in conjunction with the manufacturer’s add-ons is key to a quick solution.
In most cases, the regular Camera app is already activated by default and ready to shoot immediately after unpacking the device, but access to it can be blocked at the permission level for third-party programs or hidden as a result of the actions of a parent (Child mode) or corporate administrator. If you encounter a black screen when you start up or an error “failed to connect to the camera”, this is a signal of a conflict of processes, not necessarily a fatal matrix failure. Below we will discuss diagnostic algorithms and methods of forced activation of the module.
It is also worth considering that modern versions of Xiaomi firmware have implemented complex privacy protection mechanisms that can visually block the lens if the system thinks that the application is behaving suspiciously. Indication in the form of a green dot in the corner of the screen is not a mistake, but confirmation that the hardware is working, but the software may not receive a video stream.
Basic activation and search for a standard application
The first thing to do when trying to start a photo shoot is to make sure that the software is available and available, which is usually called “Camera” on Xiaomi smartphones and has a characteristic lens icon. The system can hide rarely used apps in the Tools folder on the desktop, which often confuses new owners looking for a familiar shortcut on the home screen.
For quick access, you can use a system search. Swipe down the center of the screen (or up, depending on the launcher settings) to call a global search, and type the word "Camera." If the application is installed and not disabled by the device administrator, it will appear in the results. Clicking on the icon will trigger the shooting module, bypassing the need to manually search for a shortcut in the depth of the menu.
There is also a hardware activation method that works even when the screen is locked, if the function has not been turned off in the security settings. Double tapping the Volume Down button instantly triggers the camera app. This is a convenient way to avoid missing an important point, but it requires a pre-check settings.
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If double-clicking doesn’t work, go to Settings → Passwords & Security → Access to the camera in your pocket (or similar path in your MIUI version) and make sure that the Camera Launch feature is activated.
It's important to distinguish between situations where an application is simply hidden and when it is forced to stop by the system. Unlike third-party downloaders, the standard MIUI shell rarely allows you to completely remove the system camera without root rights, but it can be "frozen." Check for the camera widgets on the desktop - removing them does not delete the application itself, but can create the illusion of its absence.
Configure permissions and access for applications
A common cause of a camera failure in instant messengers (Telegram, WhatsApp) or video calling apps (Zoom, Skype) is a lack of permissions. Android operating system in conjunction with MIUI requires explicit user confirmation of access to sensitive modules such as a microphone and a photo module.
To check and configure access, go to Settings → Apps → All apps. Find the program you’ve had problems with (like WhatsApp) on the list, click on App Permissions (or Rights). In the list that opens, look for Camera and make sure the switch is set to “Allowed” or “Always Allowed.”
- 📸 Select “Only during use” mode if you want to improve security and allow access only when the app is active.
- 🔒 Use Always Allow mode for video surveillance applications that need access in the background.
- 🚫 The “Disallow” mode completely blocks the lens for the selected program, which can cause a connection error.
The new versions of HyperOS can automatically turn off the camera for applications that have not been used for a long time or have been marked as suspicious, and there is a Green Dot, the indicator in the upper right corner of the status bar, and if you see a green circle, then some application is using the camera right now, and if you click on it, you can see which program activated the module.
If the problem persists after the permissions are issued, try clearing the cache of the problem application. Go to Settings → Apps → [Application Name] → Memory and click Clean (not Reset, so as not to lose correspondence if they are not in the cloud, namely cache). This often resolves conflicts of temporary files that block access to the hardware.
Diagnostics through engineering menu and testing
When standard methods don’t work and the camera doesn’t turn on anywhere (either in the regular app or in third-party ones), you need to conduct a deep diagnostic of the hardware part. In Xiaomi smartphones, there is a hidden CIT (Customer Integration Test) engineering menu, which allows you to check the performance of each component separately, bypassing the standard shooting interface.
To enter the diagnostics menu, dial the following combination in the phone code: ##6484##. If the code is entered correctly, the list of tests will open. Find the item associated with the camera in the list (usually called FrontCamera, BackCamera or simply Camera), and running this test will force the matrix to activate.
| Test result | Probable cause | Recommended action |
|---|---|---|
| Image is available | Hardware is good, the problem is in the software | Resetting or flashing |
| Black Screen / Mistake | Failure of the module or plume | Replacement of camera in the service |
| Test won't run | Blocking by system or driver | Reboot or Hard Reset |
If the camera is working correctly in the engineering menu (you can see the picture, you can take test pictures), then the module is physically healthy. CIT-menu also visible black screen or a connection error is issued, the probability of physical damage to the plume, the matrix itself or the power controller is high.
What to do if the engineering menu is not opened?
Removing software failures and cleaning the cache
Software failures are the most common reason why Xiaomi’s camera stops turning on: Cache errors, conflicts after a system update, or background processes can lead to a situation where the Camera app crashes immediately after launch or hangs on a black screen.
The first step is to clean up the data from the camera app itself. This won’t delete your photos (they’re stored in a separate gallery folder), but will return the camera settings to factory settings. Follow the Settings → Apps → All Apps → Camera → Memory and press Clear (or “Reset”). After that, try to start the camera again.
- 🗑️ Cleaning the cache removes temporary files that may have been damaged.
- ⚙️ Resetting settings returns the original exposure and focus parameters.
- 🔄 Restarting the camera process often solves the problem of sticking the module.
If the cleaning didn't work, check if In-Pack or Child mode is on, which can block access. You should also look at third-party apps that could have accessed the camera and not given it away. Try running your smartphone in Safe Mode (press the off button, then keep your finger on the "off" button on the screen for a long time). If the camera is running in Safe Mode, then one of the apps you installed is to blame.
☑️ Checklist for elimination of program errors
In some cases, disabling the “Image Improvement” option helps, or «AI-The camera is in the settings of the application itself, if the system is overloaded, and it is also worth checking the date and time - incorrect system clocks can cause security certificate conflicts, which blocks access to modules.
Hardware problems: plumes and modules
When software methods are exhausted and the engineering menu shows an error, it is about “hardware.” In Xiaomi smartphones, especially in models with waterproof or after falls, camera plumes often depart. Even a microscopic shift of the connector can cause the system to stop seeing the module.
A common problem is oxidation of the contacts or damage to the plume when replacing the battery or screen. If you recently changed the battery or glass and then the camera stopped working, there is a 99% chance that the master simply forgot to plug the plume or damaged it, in which case you need to redisassemble and visually examine the connectors under magnification.
⚠️ Warning: If you notice that the camera starts working after a slight tap on the body in the lens area or, conversely, stops working when the body is bent, this is a direct sign of poor contact of the plume.
Another hardware cause is the failure of the camera module itself or the power controller on the board, which can be due to a surge in charging voltage, moisture (even condensate) or production defects. In the case of the Redmi Note or POCO X series, there have been cases of mass failure of the main camera modules after a year of operation.
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Diagnostics in the service center is mandatory if the camera does not start in the engineering menu (CIT) - this indicates a physical malfunction that cannot be corrected by resetting the settings.
Specifics of the front and main cameras
Users often notice that the main camera works and the front camera doesn't, or vice versa, because modern smartphones use independent modules with their own plumes, and the problem with the front phone is often the contamination of proximity sensors located nearby, or the software conflict in video calls.
For the front camera, the condition of the top speaker and sensors is critical. If the speaker wheezes or is clogged with dust, it can indirectly affect the work of neighboring components. It is also worth checking whether the protective film is glued too thick, blocking the sensors, which makes the system think that the phone is in the ear, and turn off the screen and camera.
Camera settings often have a switch between the main and wide-angle lenses. Make sure you don't switch to macro mode or zoom, where focal length prevents you from seeing the object up close, creating the illusion of a camera not working (just defocus (0.6x, 1x, 2x), Check each module separately.
⚠️ Warning: Do not use aggressive chemistry to wipe lenses and sensors. Alcohol-containing solutions can damage the oleophobic coating and enlightening lenses, which permanently impairs the quality of the images.