The sudden appearance of a vertical or horizontal light line on the display of a smartphone is always an unpleasant surprise that can make the owner panic. Most often, the white stripe on the Xiaomi screen indicates physical damage to the matrix or plume, but in some cases, the problem lies in a software failure that can be fixed without going to the service center.
In this article, we will discuss in detail all possible causes of image artifacts on Xiaomi, Redmi and POCO devices. You will learn how to distinguish a software bug from “broken” pixels, what hidden MIUI functions will help to test the screen and whether to try to “warm up” the plume at home. Our goal is to give you exhaustive information to make the right decision on the restoration of the gadget.
Before we go into complex manipulations, we need to rule out the basic factors, and sometimes the problem is solved by simply restarting or updating the system, but if the defect is caused by impact or moisture, the methods will be completely different. Let's look at what exactly happened to your device.
Diagnosis: software failure or physical failure
The first step in fixing any malfunction is accurate diagnosis. If you have a white bar on your Xiaomi screen, you need to understand the nature of the white bar. Software errors are less common than physical damage, but they give you a chance to restore the device to free operation. Pay attention to the behavior of the line: does it flash, does it change color or position when you turn the screen?
For the initial check, it is recommended to perform a full reset or at least a hard reboot. Press the power button and the volume button at the same time, holding them for about 10-15 seconds until the device vibrates and the Mi logo appears. If after booting the system, the strip remains in place and its position is static relative to the matrix (does not move when scrolling the interface), the probability of physical damage is extremely high.
⚠️ Warning: If the white bar appears immediately after a smartphone drop or a strong pressure on the screen, software methods of elimination are practically useless. 95% of the time it is a rupture of the plume or damage to the matrix controller.
There is also a specific test built into the MIUI engineering menu that helps identify defective areas. To run it, open the Phone app and type the combination ##6484##. In the CIT menu that opens, select the item associated with checking the display (usually called "Display" or "Screen"). Swipe your finger over the entire surface; if the sensor responds, but the visual bar remains, the problem is the display of the image.
Software methods for removing artifacts
If the screen is physically intact (no cracks, chips, or impact marks), you can try software methods that recalibrate the display controller and reset temporary driver errors. The first and easiest way is to update the firmware. Xiaomi developers often release patches that fix compatibility issues with screen components.
Go to Settings → About Phone and click on the MIUI version to check for updates. If a new version is available, install it. In some cases, rolling back to the previous stable version of firmware if the problem occurs immediately after the update. It is also worth checking the screen refresh rate settings if your smartphone supports 90 Hz or 120 Hz. Try to reduce the frequency to 60 Hz in the Settings menu → Screen.
☑️ Checklist of software diagnostics
Another effective method is to use apps to treat broken pixels, although they are more likely to help with black dots than white lines, and the principle of their work is to quickly change colors on the screen, which can push stuck subpixels. Run such an application for 15-20 minutes, putting the phone down with the screen to avoid burning out the matrix.
Physical causes of defects
When software methods fail, you have to deal with the harsh reality of hardware problems. The white bar on a Redmi Note or POCO screen is often the result of a plume detachment. The plume is a thin, flexible conductor that connects the matrix to the main board. When you fall or vibrate, the contact can break, leading to light artifacts.
Another common cause is screen pressure, and if you carry your phone in the back pocket of your jeans or in your bag with your keys, constant pressure can damage the internal structure. OLED or IPS Matrices. OLED-In the case of the screens used in Xiaomi’s flagship models, even microscopic damage to the organic layer results in bright white or colored lines.
| Type of damage | Symptoms | Probability of repair | Cost |
|---|---|---|---|
| Detachment of the plume | The strip can blink, disappear when pressed. | High (ploughing/press) | Medium |
| Breaking the matrix tracks | Static bright line, often vertical | Low (screen replacement) | Tall. |
| Moisture intrusion | Spots, stripes, contact corrosion | Medium (cleaning of KM) | Depends on the damage. |
| Mechanical impact | Cracks, black spots, white lines | Only a module replacement | Tall. |
There is also a risk of factory failure, especially in budget models, which use thinner glass and less protected plumes. If the phone is new and not exposed, feel free to contact the warranty service.
The screen warming myth
Temporary solutions to the problem
If you can't change the screen right now, and you need to use the phone, you can use temporary measures that don't physically remove the white stripe, but make it less visible or close off access to the problem area, and one way is to use dark themes and black wallpaper. On a black background, a white stripe on AMOLED-Xiaomi screens may become less contrasting as black pixels just turn off.
You can also change the interface scaling. Go to Settings → Advanced Settings → For developers (if the menu is hidden, click 7 times on the build number in About Phone). Find Smallest width. Changing the value can shift interface elements by removing important buttons from under the white bar.
Another option is to use blue light filters or Read modes that change the color gamut. While this won't hide the white line completely, changing the color rendering can reduce visual discomfort. However, remember that these are just crutches, and the problem will progress over time: the stripe may become wider or larger.
When professional repairs are needed
Situations where self-intervention is useless are easy to identify. If the white bar on the Xiaomi screen is accompanied by touchscreen problems (the screen does not respond in the band area or, conversely, “phantomly” presses buttons), this is a sign of damage to the digitizer. In modern smartphones, the display and touchscreen often represent a single module, and the whole replacement is done.
The critical signal is the expansion of the defect area, and if it's a thin thread today and it's a wide white spot tomorrow, the degradation of the matrix is triggered, and in such cases, delaying the screen can completely fail, and then you can't even unlock the device to save data.
⚠️ Warning: Don't try to disassemble the phone yourself if you don't have the experience and tools. The internal plumes in modern Xiaomi are very thin and easily break when a sloppy autopsy.
Professional repairs include diagnostics on special equipment, where the wizard will determine whether to change the entire display module or simply re-adhesive the plume (which is rarely done and requires expensive equipment). Authorized service centers use original products, which ensures the preservation of brightness, color reproduction and operation of the fingerprint scanner.
Prevention and protection of the display
To avoid a repeat of the white stripe situation in the future, you need to follow the rules of operation. The main cause of failure is mechanical stress. The use of high-quality protective glass and a bumper case significantly reduces the risk of damage to the matrix when you fall flat.
Extreme temperatures should also be avoided, and extreme temperature changes (exit from heat to frost) can lead to condensation inside the case or change the properties of the glue connecting the screen layers. OLED-cold-sensitive matrices.
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The best protection against the appearance of stripes is the careful handling and presence of a protective film or glass that takes on some of the mechanical stress on impact.
Check the condition of the case regularly. If you notice that the frame of the smartphone is deformed or the battery is swollen (which presses on the screen from the inside), immediately contact the service. Pressure from the inside is one of the hidden reasons for the artifacts on the display.