Why the screen on Xiaomi goes out: reasons and solution

When a screen on Xiaomi suddenly goes out while watching a video, a conversation or a game, it can throw anyone out of balance. Instead of the expected image, the display suddenly turns black, creating a feeling of failure of an expensive gadget.

But most of the time, the problem isn’t a physical malfunction, but rather software conflicts or ill-functioning light sensors. The Android system on Xiaomi smartphones has multiple layers of protection and energy saving that can react aggressively to certain user actions. Understanding the logic behind these mechanisms is the first step to fixing the problem.

In this article, we will discuss in detail the main scenarios in which the display may turn off, and offer proven diagnostic methods, you will learn to distinguish between harmless system processes from serious hardware defects that require the intervention of the service center.

Specificity of the sensors and the proximity sensor

The most common reason Xiaomi's screen goes out is to activate the proximity sensor, a small module that is usually located at the top of the case next to the speaker, which reacts to finding foreign objects in the immediate vicinity, and if you accidentally shut off light access to that sensor while talking or watching content, the system perceives it as bringing the phone to the ear and extinguishing the display to save charge.

The problem can be compounded by the presence of a protective glass or cover that physically covers the area of the sensor, and even a thin film that is pasted in violation of technology can create glare or distort the readings, causing MIUI to think that the phone is in your pocket, in which case the screen will go out chaotically, reacting to the slightest movement of the hand in the air.

⚠️ Warning: Excessive amounts of dust or fat in the upper end of a smartphone can clog the sensor. Regularly wiping this area with microfiber helps avoid false positives.

To diagnose this problem, there is a built-in engineering test. Go to the call menu and dial ##64663#. From the list that opens, select the item associated with the Proximity Sensor. Cover and open the top of the screen with your hand, watch for the change in values: if the reaction is delayed or values do not change, you may need to calibrate or replace the part.

Power saving settings and screen lock

The second most common reason is the aggressive energy saving policy embedded in the MIUI shell. The system seeks to maximize battery life, so it can force the screen to be extinguished if it believes that the user is not interacting with the device, which often happens when watching long videos or reading articles when you do not touch the display for a long time.

To check and change these settings, go to Settings → Battery and Performance. Here you should pay attention to the CPU modes and timeout settings. If you select the Power Saving mode, the system can limit background activity and screen brightness more than necessary for comfortable use.

• 🔋 Check the screen timeout settings in the Settings section → Lock the screen. Set the value of "2 minutes" or "5 minutes" for comfortable reading.
• 📉 Turn off the “Increased Time to Turn Off Screen” feature in the battery menu if it doesn’t work properly with apps.
• 🛑 Make sure that for video players (YouTube, Kinopoisk) in the battery settings, there is no restriction of background activity.

Also worth mentioning is the Pocket Mode feature, which sometimes works too sensitively, designed to lock buttons in your pocket, but can mistakenly trigger if the phone is lying on a soft surface. Disabling this option in the Screen Lock section often solves the problem of sudden display quenching.

Failures in the operation of the operating system and applications

Software instability is another factor that affects display behavior: If the screen goes out in only one particular application, such as a browser or social network, the problem lies in the optimization of the program itself. Conflict of Android versions and installed software can lead to a video driver freeze, which visually looks like turning off the backlight.

Often the culprit is cached data that accumulates over long periods of time, and overflowing cache of system services or a particular application can cause failures in image rendering, in which case cleaning memory or reinstalling problematic software helps.

If the problem is observed after a recent system update, the new firmware version may contain errors, in which case it is worth waiting for a patch from the developers or, if you have the skills, roll back to the previous stable version of MIUI.

Problems with protective glass and accessories

Don't underestimate the impact of external accessories on sensors. Cheap black-framed security windows often override the light sensor next to the front camera, creating a blind spot, and the phone doesn't know what's in the light, keeping the screen off or quenching it at the slightest movement.

Magnetic bookcases can also cause problems if the magnetic fastener is not well positioned. The magnetic field can affect the Hall sensor, which is responsible for determining the position of the cover of the case. If the system "thinks" that the case is closed, it instantly extinguishes the screen.

To check, remove all the protective windows and covers, leaving the phone in the "naked" form. If the problem disappeared, then the cause was precisely a mechanical obstacle, in which case replacing the accessory with a better one, with the correct cutouts for the sensors will help.

⚠️ Note: Using non-original chargers can cause voltage surges that result in a short-term blackout of the screen backlight. Use only certified cables.

Hardware malfunctions of the display module

If software methods didn't work, we'd have to consider a more serious scenario, a physical breakdown, where the display plume connecting the matrix to the motherboard could move away from the vibration after the fall, in which case contact appears and disappears, causing the screen to blink or completely quench.

It's also possible that the backlight itself or the power controller of the screen will fail, which often happens after moisture or a heavy impact, and if the screen goes out but the phone continues to sound or vibrate, it's likely that the hardware is the problem.

You can diagnose this by connecting the phone to the computer, and if the PC sees the device, but the black screen may have burned the backlight controller, and in such cases, professional repairs are required at the service center.

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Before going to the service center, take a screenshot of the screen (a combination of buttons Volume Down + Power). If you see everything in the resulting image, then the matrix is intact, and the problem is in the backlight or the plume.

Radical methods: Resetting and flashing

When all the previous steps failed, the final argument is a complete reset, which will bring the smartphone back to factory status by removing all user data and potentially conflicting settings, the most effective way to eliminate a software bug.

Before starting the procedure, be sure to back up all important data, as it will be destroyed in the process. Go to Settings → About Phone → Reset and select “Erase All Data.” Once the phone is rebooted, it will look like new.

Even if a full reset didn't work, it means the problem lies deeper in the system's firmware files, in which case you might need to flash the device through your computer using the Mi Flash Tool, a complex process that requires you to follow the instructions precisely so you don't turn the phone into a brick.

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Full resetting eliminates 90% of the software errors associated with screen quenching, but requires prior data storage.

Frequently Asked Questions (FAQ)