The appearance of unwanted artifacts on the display of a smartphone is always alarming, especially when it comes to popular Xiaomi models.The white stripe located at the bottom of the screen can significantly complicate navigation and user interface.
The causes of the defect range from software failures of the MIUI shell to mechanical damage to the matrix. In some cases, the band is the result of malfunctioning of system fonts or application conflict. However, you should not ignore the symptom, as it can signal the beginning of detachment of the plume.
In this guide, we will take a look at all possible ways to fix a malfunction, learn how to distinguish between software and hardware causes, and learn what actions you can do yourself without going to a service center.
Diagnostics: software failure or broken matrix
The first step is always to make a thorough diagnosis, to see if the problem is in the logical part of the operating system or if the physical hardware is affected, and if the band only appears in a particular application, it is likely a software conflict.
Notice the nature of the defect. If the white line pulses, changes brightness, or disappears when you press the screen, this is a sure sign of poor contact of the plume or damage to the display controller. Software glitches usually behave more statically.
There is a simple test that can detect broken pixels or subpixel sticking, run videos with rapidly changing colors, or use special apps to check the screen. If the band remains white and does not change the shade, the probability of hardware failure is high.
- 🔍 Include a bright white picture on the full screen and carefully examine the band boundaries at different brightness levels.
- 📱 Try to run your smartphone in safe mode to eliminate the impact of third-party applications.
- 🎥 Record video from the screen of another device to capture the nature of the flicker, if it is present.
⚠️ Note: If the band appeared immediately after the fall of the smartphone or hit a hard object, software methods may not help, in which case there is a high risk of damage to the inner layer of the matrix.
It's also worth checking if the artifact is related to a recent system update, and sometimes a new firmware version contains optimization errors for a particular display model, in which case it will affect many users at the same time.
Basic display settings and calibration
Often, simple manipulation of display settings helps to solve the problem. MIUI provides a wide range of tools for controlling the screen. Go to the settings menu and find the section responsible for the display.
Try changing the screen resolution or refresh rate. 60 Hz and 90/120 Hz can restart the display controller and fix the temporary rendering failure, which is especially true for models with a high-end display. AMOLED-matrix.
Another effective method is to change the theme of the design. Xiaomi standard themes sometimes conflict with system interface elements. Installing a standard “Classic” theme or theme from a third-party developer can remove the visual artifact.
- 🎨 Go to the Themes app and select any standard theme for the design.
- ⚙️ Turn off adaptive brightness and set the slider manually to the middle level.
- 🔄 Change the font size and scale in the menu “More».
In some cases, turning on the Reading mode or changing the color temperature helps, which changes the voltage applied to different parts of the matrix, which can temporarily revive the problem area.
Use of engineering menus and codes
To better diagnose and manage hidden features of Xiaomi’s smartphone, it’s designed to have an engineering menu that is accessed via a standard call, a powerful tool that requires caution.
Enter the code ##6484## to enter CIT testing mode, where you can conduct a full check of all components of the device, including the touchscreen and display, and test to determine whether the touchscreen reacts in the white stripe area.
#6484## - Entrance to the CIT Engineering Menu
#4636## - Menu of phone informationThere is also a code for checking LCD-screen, which often helps to "break through" stuck pixels or reset the controller settings «LCD» And you start the color cycle. Leave the phone on this mode. 10-15 minute.
Is the engineering menu dangerous?
If standard codes don't work, your firmware version may be blocking access to them, so you can try emulator apps. USSD-Google Play Store codes, although newer versions of Android don’t always work.
Resetting and reinstallation of the system
If the software conflict is deep, you may need to reset your settings completely, and make sure to back up all important data before doing so, as all user files will be deleted in the process.
Reset the recovery menu. Turn off your phone and press the power and volume button combination. From the menu that appears, select Wipe Data or Clear Data.
☑️ Preparation for data dumping
A more radical but effective method is to flash the device, and the Mi Flash Tool allows you to install the latest version of the software, eliminating any software errors left over from previous versions.
| Method | Difficulty | Data retention | Efficiency |
|---|---|---|---|
| Change of subject | Low. | Yes. | Low. |
| Resetting settings | Medium | No. | Medium |
| Flip-flashing | Tall. | No. | Tall. |
| Replacement of the plume | Very high. | Yes. | Maximum |
After installing a clean system, watch the screen carefully during the first hours of operation, if the lane did not appear, then the problem was in the software, and if the defect returned immediately after loading the desktop, the reason lies in the hardware.
Hardware causes and plume repairs
When software methods are exhausted, you have to admit that there's a physical malfunction, and the white stripe often indicates that there's a disruption in the contact between the display plume and the motherboard, and it can be due to vibration, a fall, or a factory defect.
Replacing a plume or display module on its own requires special tools and skills. In modern Xiaomi smartphones, screens are often glued to the frame, making it difficult to dismantle. Inept actions can lead to glass breaking or damage to other components.
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Before contacting the service, try to slightly (very carefully!) press the upper and lower edges of the case in the area of the screen. If the band responds to pressing, the problem is precisely the contact of the plume.
At the service center, the wizard will open the device and check the condition of the connector, often just cleaning the contacts or soldering the plume, and if the matrix itself is damaged (a crack within the layers), you will need a complete replacement of the display module.
- 🛠 Check for warranty: mechanical damage is usually not covered, but factory defects are.
- 💰 Find out the cost of the original module, as cheap copies can have the worst color reproduction.
- 🔌 Make sure the problem isn’t with the battery that might have swelled and pressed on the screen from the inside out.
⚠️ Warning: Do not try to heat the screen with a hair dryer or put the phone on a hot battery. High temperature can damage the adhesive layer and OLED-structure, making repairs impossible.
Prevention and proper operation
To avoid a recurrence of the problem, it is important to follow the rules of operation of the smartphone. Avoid overheating the device, as high temperatures negatively affect the adhesive connections inside the display.
Using high-quality protective glass and a case with raised sides will help protect the screen from impacts when falling, and even if the glass breaks, it will take over the main energy of the impact, keeping the matrix intact.
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Regular system updates and the use of proven applications reduce the risk of software conflicts causing artifacts on the screen.
It is also recommended not to overload the processor and memory excessively, especially on older models.CPU overheating can be transmitted to nearby components, including display plumes, causing temporary malfunctions in their operation.
If you notice that the band only appears when the battery is low, it may be due to unstable voltage, in which case it is worth considering replacing the battery, since its wear affects the operation of the entire device.