When the screen of Xiaomi phone flashes, it can take any smartphone owner by surprise. Sudden flashes, ripples or complete attenuation of the display can occur at the most inopportune moment, making use of the device impossible, most often users face this during calls, watching videos or unlocking the gadget.
The problem can be both software-based, with errors in the MIUI shell, and hardware-based, indicating damage to the plume or the matrix itself. Diagnostics of a malfunction requires careful analysis of symptoms, since the methods for correcting software bugs and physical breakdowns are radically different. Ignoring symptoms can lead to a complete failure of the display module.
In this article, we will detail the main reasons why the screen flickers on Xiaomi, Redmi and POCO, and provide step-by-step instructions for restoring health, learn how to distinguish a system failure from a serious breakdown, and learn what settings can provoke unstable backlighting.
One of the most common reasons that users notice that the phone's screen is flashing is because the proximity sensor is inoperative, and it's located at the top of the case, and it's designed to turn off the display during a conversation so that you don't accidentally click the end button, and if the sensor is contaminated or malfunctioning, it can randomly signal the backlights on and off.
Clogging the dynamic speaker area with dust, pocket pile or protective film often triggers false positives. In these cases, the screen can go out or blink even if you don't bring the phone to your ear. The system perceives the obstacle as an object approaching and tries to save energy or prevent accidental tapping.
To test this theory, it is enough to look carefully at the top of the device with the lights off using another phone's flashlight. Often the problem is solved by trivial cleaning of the area around the front camera and the speaker with soft fabric. However, if you have recently changed the glass or display, the reason may lie in poor calibration of the sensor after repair.
If cleaning didn’t work, check the sensor sensitivity settings through the engineering menu, and in the Phone app, dial ##6484## and select “Proximity sensor” where you can see the current readings and start the calibration procedure by pressing the appropriate button.
⚠️ Warning: Do not glue the top of the screen with tight black-framed protective glass if they overlap the sensor, guaranteed to cause the display to blink constantly during conversations.
The MIUI's power management system includes Adaptive Brightness, which automatically adjusts the level of illumination depending on the lighting in the environment. Sometimes the algorithms work incorrectly, causing sharp spikes in brightness that the user perceives as blinking, especially when you go from a dark room to bright light and back.
To rule out this factor, you need to force the automatic adjustment to turn off. Go to Settings → Screen → Brightness Level and uncheck the "Adaptive Adjustment" box. After that, manually set a comfortable backlight level and observe the display behavior for some time.
Also worth looking at is Read Mode or Paper Screen, which can change color temperature and brightness to create a flickering effect on certain backgrounds. Disabling all the additional blue light filters will help you understand if the software add-ons to the interface are the cause. If after turning off all the improvers, the screen stops flashing, the problem is solved.
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Use the brightness widget in the notification curtain for quick check: if the slider moves on its own, then a conflicting process or light sensor is operating in the system.
Another software factor is the screen refresh rate, especially on models with AMOLED-matrix and support for 90 or 120 Hz. Some versions of the MIUI firmware have been observed bugs when switching between applications or with low battery power, the system could not consistently keep the declared frequency, which caused visible jitters or flickering images.
In this section, we'll look at deeper system settings that can affect the stability of a display. Often users are unaware that the themes or live wallpaper they set consume GPU resources and cause artifacts. Changing a standard theme to a classic one can instantly solve the problem.
Some ad viruses can block the screen or cause it to blink, requiring payment or an “antivirus” installation, and checking the system with an integrated security scanner or a third-party antivirus will help identify hidden threats.
☑️ Diagnostics of program failures
If you notice that the Xiaomi phone screen only flashes in certain apps, such as YouTube or Instagram, the problem may be optimizing specific software. Updating the app via Google Play or Mi Store, and cleaning its cache in app settings, often eliminates visual glitches.
In cases where simple settings don’t work, try resetting all settings to factory settings. This action won’t delete your personal data (photos, contacts), but will return system settings to the original state. The way to execute: Settings → About phone → Resetting → Reset settings (not to be confused with a full data reset).
⚠️ Warning: Before any manipulation of system settings, be sure to back up important data in the Mi Cloud cloud or on your computer to avoid losing information.
What is DC Dimming and how does it affect the screen?
When the software is exhausted and the screen continues to flash, it's probably hardware, and the most common physical reason is that the display plume is moving away from the motherboard, and it can happen after the phone falls, even if you can't see external damage to the body, or because of a factory failure of the assembly.
In such cases, light pressure on the top or bottom of the screen (in the vicinity of the plumes) can temporarily stabilize the image. If the blinking stops or, on the contrary, increases, this is a direct sign of poor contact. It is necessary to disassemble the phone to reconnect the plume only if you have experience and tools, since it is easy to damage fragile components.
Another serious problem is the degradation of the matrix itself. AMOLED-If you have colored stripes that change all the time, or black spots that creep out, it indicates that the insides of the display are damaged, and if you have a complete module replacement, you can only do that.
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If pressure on the body changes the pattern of blinking, the problem is almost certainly the physical contact of the plume or damage to the matrix.
The unstable operation of the power controller can also cause chaotic backlight behavior. If the voltage applied to the display jumps, the brightness will float or the screen will go out. This is often accompanied by a rapid discharge of the battery or heating of the bottom of the smartphone.
To diagnose hardware problems, Xiaomi’s engineering menu has a special test. Run the check with code ##6484## and select Display or Screen. If the test image shows artifacts that do not disappear after the reboot, repairs to the service center are inevitable.
Below is a table that helps classify symptoms and probable causes of malfunction:
| Symptoms. | Probable cause | Method of decision |
|---|---|---|
| The screen goes out during the call. | Pollution of the proximity sensor | Cleaning of the upper frame, calibration |
| Flickering at low brightness | SWEM lights (AMOLED) | Turning on DC Dimming, increasing brightness |
| Colorful stripes or ripples | Damage to the plume or matrix | Replacement of the display module |
| Screen flashes in one app | A bug or a cache | Reinstallation of the application, cache reset |
In some cases, the flashing screen can be caused by incompatibility of the installed custom firmware or recovery. If you have experimented with root rights or installed third-party Android builds, the likelihood of software conflicts is extremely high.
It's also worth checking if the device is overheating, and at critical temperatures, the processor can reduce performance, and the system can turn off energy-intensive components, including screen lights, to protect it, let the phone cool down and check if the problem persists.
If you find that the screen flashes after moisture hits, immediately turn off the device. Moisture could cause a short circuit in the display power chain. Turning on a wet phone can lead to irreversible consequences and corrosion of contacts.
⚠️ Warning: Don't dry your phone on a battery or hair dryer! high temperatures can damage the display and battery adhesives, and also aggravate corrosion.
To sum up, if the Xiaomi phone's screen flashes, the software part is the first step in diagnostics, and sensor checks, settings resets, and software updates solve the problem 60 percent of the time, but if symptoms indicate physical damage, it's best not to wait to go to the service center to prevent the device from completely failing.
Regular maintenance of the device, the use of quality accessories and careful handling significantly reduce the risk of such malfunctions. Remember that timely response to the first signs of unstable screen operation can save you money on expensive repairs.