The situation when the screen of a Xiaomi phone goes blank while watching video content is one of the most annoying problems for users. Imagine enjoying your favorite movie or educational video and suddenly the display turns off, leaving you in complete darkness, although the sound continues to play. Most often this happens due to incorrect operation of the proximity sensor, which mistakenly believes that the phone is near the ear, as during a telephone conversation. However, the reasons may be deeper and relate to system energy saving settings or specific errors in the shell. In some cases the problem lies in physical dirt on the top of the case, and in others it is a software conflict. In this article, we will analyze in detail all possible scenarios why the display turns off and provide step-by-step guide for restoring normal operation of your device. proximity sensor, who mistakenly believes that the phone is at the ear, as during a telephone conversation.
However, the reasons may be deeper and relate to system power saving settings or specific errors in the shell MIUI. In some cases the problem lies in physical dirt on the top of the case, and in others it is a software conflict. In this article, we will analyze in detail all possible scenarios why the display turns off, and provide step-by-step guide for restoring normal operation of your device.
Problems with the proximity sensor and protective film
The most common reason why the screen turns off when watching a video on Android Xiaomi is the proximity sensor. This component is located on the top of the smartphone, usually next to the earpiece. Its task is to determine the distance to objects. If it receives a false signal that something is in front of it, the system automatically turns off the backlight to save battery and prevent accidental clicks.
Often the culprit is a poorly applied protective glass or film. If an accessory covers the sensor area or has too thick adhesive in the sensor area, the light beam simply cannot pass through it. As a result, the sensor “thinks” that the phone is pressed to the ear and turns off the screen. Even a microscopic layer of dust or grease in this area can distort the readings.
Try wiping the top edge of the device with a soft cloth. If this doesn't help, check to see if the edge of your case is touching the sensor area. Sometimes case manufacturers make the cutouts inaccurately, and the edge constantly blocks the sensor. In this case, the only solution is to replace the accessory with a model with the correct cutout Xiaomi.
To check the functionality of the sensor without third-party apps, you can use the engineering menu. Enter the code ##6484## in your phone to enter CIT mode. Find the test Proximity Sensor in the list and cover the top of the screen with your hand. If the indicator changes color from red to green, the sensor is working properly, and the problem should be looked for in the software.
If you have a protective glass with a black frame, make sure that it does not block the sensor. Sometimes it is enough to carefully cut the edge of the film with a blade in the sensor area to solve the problem.
Power saving settings and display timeout
The second most popular reason is the aggressive power saving policy embedded in the shell MIUI. The system tries to maximize battery life by turning off the display when there is no active touch. If you watch a video without touching the screen for a long time, the algorithm may decide that the device is idle and turn off the backlight ahead of schedule.
You need to check the screen timeout settings. Go to the section Settings → Display and brightness → Sleep mode. Make sure you select a value of at least 2 or 5 minutes. If set to "15 seconds" or "30 seconds", the screen will go dark too quickly, especially if the video player does not send a signal to the system that the content is playing.
It is also worth paying attention to the “Pocket Mode” function. It is designed to lock the phone in a bag, but sometimes it works falsely. Disable this option in the menu Settings → Screen and brightness → Pocket mode. This will eliminate the possibility that the light or proximity sensor will interpret the environment as being in a dark, enclosed space.
⚠️ Attention: In the latest versions of MIUI, the settings menu may differ. If you don’t find the “Pocket Mode” item, look for it in the “Screen lock” section or use the settings search by entering the word “pocket.”
Another important aspect is the settings of a specific video application. Some players have their own functions to dim or stop playback when focus is lost. Check the settings inside YouTube, VLC or whatever player you are using. Make sure that options like “Stop when screen is off” are not activated there if your goal is to continue watching with the backlight on.
Software conflicts and MIUI updates
Software glitches are a hidden but common cause of unstable display operation. After updating the firmware Android or shell MIUI conflicts may occur between system services and installed applications. For example, Google Play Services or the system's power management process may not correctly handle screen activity status.
If the problem appears immediately after a system update, try clearing the system application cache. This will not delete your personal data, but it will reset temporary files that may have become corrupted during the update. Go to Settings → Applications → All applications, find the application in which the problem occurs (for example, YouTube), and click Clear cache.
In more complex cases, you may need to reset the network settings or even completely reset the device. However, before taking drastic measures, it is worth checking for updates for the applications themselves. Go to Google Play Market or GetApps and update all apps to the latest versions. Developers often release patches that improve compatibility with new versions of Android.
Sometimes the culprit is “optimizers” and memory “cleaners” from third-party developers. They can forcefully close the video player's background processes, deeming them useless, which causes the screen to darken. Uninstall such utilities, since the built-in tools Xiaomi cope with this task more efficiently and safely.
How to perform a full reset without losing data?
Hard Reset deletes ALL data. To save the information, be sure to make a backup copy to the Mi Cloud or to your computer before starting the procedure. Press the power and volume up buttons to enter Recovery Mode.
Diagnostics through the engineering menu and tests
For in-depth diagnosis of problems with the screen and sensors in smartphones Xiaomi a special engineering menu CIT (Calibration and Test) is provided. Access to it allows you to check hardware components directly, bypassing the standard user interface. This is the best way to understand whether the problem is physical or software.
To get to the menu, open the Phone application and dial the combination ##6484##. A list of tests will open in front of you. We are interested in items related to the screen and sensors. Select Touch Sensor to test the display's response to touches across the entire area. If the screen does not respond in any area, this may be the cause of the failure.
Then proceed to the test Proximity Sensor. Place your phone on a flat surface and place your palm on top. The indicator on the screen should change state (usually from 5.0 to 0.0 or change color). If the values do not change or “jump” for no reason, the sensor is faulty or dirty from the inside.
| CIT test | What it checks | Normal result | Symptom of malfunction |
|---|---|---|---|
| Proximity Sensor | Proximity sensor | Clear switching 0/1 | Constant 0 or chaotic jumps |
| Display Color | Screen matrix | Uniform color without spots | Dead pixels, stripes, flickering |
| Touch Sensor | Touchscreen | Drawing lines without breaks | Missing clicks in certain areas |
| Light Sensor | Light sensor | Changing lux when darkening | Lack of response to light/shadow |
If tests show errors that cannot be resolved by rebooting; components may need to be replaced. In the case of software errors, tests may pass, but the problem persists during normal use. This indicates the need to reflash the device.
The CIT engineering menu is the most reliable way to distinguish a physical breakdown of the sensor from a software glitch. If the tests fail, software methods will not help.
Third-party applications for holding the screen
If system settings do not help, and the screen continues to go dark at the most inopportune moment, you can resort to the help of specialized software. There are lightweight utilities designed specifically to block the auto-shut-off function of the display. They emulate a touch that is invisible to the system or send a signal about activity.
One of the most popular solutions is an application Caffeine or its analogues. After installation, an additional button (often in the form of a cup of coffee) appears in the notification shade. Activating this button prevents the phone from going into sleep mode for a specified time or until manual cancellation.
- ☕ Caffeine —a minimalistic application that adds a timer to quick settings.
- 🌙 Keep Screen On —allows you to set exceptions for specific applications, for example, only for the video player.
- ⚡ Screen Alive —offers a “shake” mode to wake up the screen without pressing buttons.
Using such apps is a temporary “crutch” solution, but it is very effective if you do not want to delve into deep system settings or wait for a firmware update. Just install the application, give the necessary permissions and activate the function before starting the video.
However, remember that constantly running the screen at maximum brightness will significantly speed up battery drain. Use such utilities with caution, especially if you are away from the charger. It is better to reduce the brightness manually, but leave the screen on, than to lose the charge in 30 minutes.
Radical measures: reset and flashing
When none of the above methods worked, the option remains with a full factory reset. This action will erase all user data, apps and settings, returning the phone to its out-of-the-box state. This often eliminates deep system conflicts that have accumulated over a long period of use.
Before performing the procedure, be sure to create a backup copy of your contacts, photos and important documents. Synchronize the data with your account Google or Mi Account. After the reset, the phone will need to be configured again. If the problem was in an erroneous system file, it will disappear.
Settings → About phone → Reset settings → Erase all dataIf even a full reset did not help, the problem may lie in the firmware version itself. In this case, it is recommended to reflash the device via a computer using the official utility Mi Flash Tool and a stable version of the software (Stable ROM) downloaded from the official website. This guarantees the installation of a clean system image without over-the-air update errors.
⚠️ Attention: Flashing the device via Mi Flash Tool requires an unlocked bootloader. The unlocking process may take 3 to 7 days and will completely erase data from your phone.
In cases where flashing does not solve the problem, we are talking about a hardware malfunction. Perhaps the proximity sensor cable inside the case has come loose or the screen matrix itself has failed. Here, only contacting an authorized service center will help Xiaomi for diagnostics and repairs.
☑️ Preparing for a full reset
Frequently asked questions (FAQ)
Why does the screen go dark only in YouTube, but works fine in other applications?
Most likely, the problem is in the settings of the YouTube application itself or in the “Auto-Brightness” function, which conflicts with the video player. Try disabling auto-brightness manually before starting a video. Also check to see if YouTube's Data Saver mode is enabled, which may affect the behavior of the screen.
Can a virus cause the screen to turn off?
Theoretically, yes, malware can block the operation of sensors. However, this is rare on Android. Most often, the reason is incompatibility of installed optimizer applications. Scan your phone with the built-in antivirus or Security application from Xiaomi.
Will calibrating the proximity sensor through third-party applications help?
Calibration applications can help if the software thresholds are lost. But if the sensor is physically defective or covered with film, software calibration will not work. It is better to rule out physical reasons first.
Does the screen on Xiaomi go dark when watching a video due to overheating?
Yes, if it is overheated, the system can forcibly reduce the brightness or turn off the display to protect components. If your phone is hot to the touch, let it cool before continuing to watch. Remove the cover if it interferes with heat dissipation.
What to do if the proximity sensor is filled with liquid?
If moisture gets inside, the sensor may not work correctly. Do not try to dry it with a hairdryer on a hot setting. Place the phone in a dry place with silica gel for 24-48 hours. If the problem does not go away, you will need to disassemble and clean the board in the service.