A sudden spot on a smartphone display is always an unpleasant surprise that can cloud the use of even the most reliable device. Xiaomi, Redmi and Poco users often face this problem, and the reaction varies from panic to attempts at self-repair. It is important to immediately understand the nature of the defect, as it depends on the further actions and cost of recovery.
Sometimes what seems to be a fatal matrix breakdown turns out to be a software failure or pixel sticking that can be fixed by software methods. However, in most cases, dark or colored artifacts indicate physical damage to screen layers or degradation of organic compounds in the body. AMOLED-In this article, we will discuss in detail all possible causes and algorithms of actions.
Diagnosis: software failure or physical defect
The first step is to always be a thorough diagnostic to separate software glitch from hardware problems. If there's a stain on the display, but the touchscreen is working properly and the image itself is distorted only in statics, there's a high probability of a software artifact. Try taking a screenshot of the screen and opening it on another device or just moving the application window.
If you move windows or change an image, the spot stays in place and floats with the pixels, the problem is the matrix itself, it could be a broken pixel that's stuck in one color, or more serious damage to the crystal lattice, and software methods are powerless because the physical structure of the screen is broken.
- 🔍 Take a screenshot and take a close look at it on PC – if the spot is not on the screenshot, but it is on the phone, the problem is in the matrix.
- 🔄 Restart your device in Safe Mode to eliminate the impact of third-party filtering apps.
- 🎨 Run a solid color test image (white, black, red) to detect contrasting defects.
In some cases, it helps to completely reset or reflash, but this is the last resort, if after returning to the factory settings, the artifacts did not disappear, then it is the hardware, and you should not delay the call to the service if the stain begins to grow.
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If the spot is visible on the screenshot taken on the phone itself, it is a software display error, if not, a physical matrix defect.
Spot typology: black, pink and yellow artifacts
The color and shape of the spot can tell a lot about the reason for its appearance. On screens made using AMOLED technology, which Xiaomi actively uses in flagship and mid-budget models, there are most specific defects. The black spot usually indicates that the organic LEDs in this area stop (glow) due to leakage or mechanical impact.
Pink or purple spots, often spreading like ink, are a classic sign of oxygen or moisture entering layers of the matrix, a process that is irreversible and progressive. Yellow spots, especially at the top of the screen near the front camera, often indicate local overheating or burnout of organic matter.
⚠️ Attention: Pink or purple spot on AMOLED-It's going to grow over time, taking over a new area.
White or yellowish spots in the corners of the screen can be the result of uneven pressing of the plume or deformation of the smartphone body. If the phone fell or it was pressed heavily in the pocket, the pressure could damage the inner layers of the display, which caused a change in color reproduction in a particular area.
Why do spots appear in the corners?
Screen Burn-in: Causes and Prevention
Burn-in is a familiar term for OLED and AMOLED displays, where a static image that sits on a screen for a long time leaves a “ghost” trail. On Xiaomi smartphones with bright and contrasting screens, this can happen if you don’t change your live wallpaper for months or keep your navigation with a bright interface on.
The burnt areas look like dimmer zones, repeating the contours of icons, keyboards or controls. Unlike mechanical damage, burnout occurs gradually. At first, the defect is visible only on a white background, but over time becomes visible in normal use.
- 📉 Brightness reduction: Use automatic brightness control to avoid overheating the pixels.
- ⏳ Screen timeout: set a short time before the display is turned off (30-60 seconds).
- 🌑 Dark theme: Include a dark interface theme to reduce the load on organic LEDs.
Modern MIUI and HyperOS firmware have built-in protection mechanisms, such as pixel shifting, that quietly move the image to distribute the wear evenly, but it is impossible to completely eliminate the risk of burnout under extreme loads.
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Use the Hide Notch or Full Screen Mode feature in the screen settings to mask the small burnout areas at the top of the display.
Mechanical damage and pressure on the matrix
Often users don't even remember the moment of the impact, but the stain on the screen has already appeared, which can be due to point pressure, for example, if the phone was in a stuffed backpack next to the keys or was crushed by a heavy object, the internal structure of modern displays is very fragile, and even microscopic pressure can cause layers to rupture.
If a black spot with cracks or characteristic spiders appears after the fall, it is a direct break in the matrix, in which case the glass may even be whole, since the main load fell on the inner layers, repair in such cases is possible only by completely replacing the module.
| Type of damage | Appearance | Recovery capability | Reason. |
|---|---|---|---|
| A broken pixel | Point of the same color | Partial (programmatically) | Factory marriage or wear and tear |
| Depressurization | Growing purple stain | No (replacement only) | Impact, moisture, factory defect |
| Burnout (Burn-in) | The dim contours of icons | No (can be hidden) | Static image, high brightness |
| The light (White spot) | Bright white spot | No (replacement only) | Screen pressure, punch. |
It's important to distinguish between a cracked glass and a broken matrix, and if the glass cracks, but the image is clean and there's no stain, you're lucky it's cheaper to replace the glass, but if the glass is intact and the ink blot underneath it, you'll have to change the entire prefabricated module.
☑️ Check after the fall
Programming methods for eliminating defects
Before you bring your phone to the service, it’s worth trying software techniques, especially if you suspect stuck pixels. There are special apps and video clips that quickly change colors on the screen to try to “clinch” the pixel. This method is only effective for stuck pixels (stuck pixels), but is powerless against dead pixels (dead pixels) or spots.
One way to do this is to use Xiaomi’s built-in engineering tests, which is to open the Phone app and dial ##6484#. From the CIT (Customer Information Test) menu, select the item associated with the display check (usually called Display or Color Bar) to help pinpoint the defect.
adb shell settings put system screen_brightness 255Sometimes it helps to calibrate the screen through the engineering menu or special screens. APK-files that reset the color rendering profile (ICC Profile) to factory values: If the stain was caused by a driver failure or an incorrect color temperature, this method can return the screen to its normal appearance.
⚠️ Warning: Don't use folk methods like lightly massaged screens with your finger or pencil. AMOLED-In the case of matrices, this is 99% likely to cause the final failure of the display.
If software tests show that the pixels in the spot zone simply do not light up or burn in the wrong color, and this does not change when rebooting, then the resource of this area is exhausted or physically damaged.
Replacement of the display: cost and nuances of the procedure
When it becomes obvious that the stain is a physical defect, only a replacement remains. In Xiaomi smartphones, screens are often glued around the perimeter, which requires careful heating and opening. Self-replacement is possible, but requires skills and tools: thermophene, suckers, thin plastic blades and special glue.
When ordering a spare part, it is important to pay attention to the type of matrix. Original AMOLED screens are much more expensive than counterparts like IPS or TFT. Installing a cheap analogue on the flagship Xiaomi can lead to the loss of Always-On Display, a decrease in brightness and the appearance of frames ("hip") at the bottom of the screen.
- 💰 Original module: retains picture quality, print scanner in the screen and brightness.
- 📉 Copy (OLED/AMOLED): may have worse color reproduction and no autobrightness.
- ❌ Copy (IPS/TFT): thicker than the original, worse viewing angle, often does not work finger scanner.
After the replacement, it is highly recommended to calibrate the touchscreen and check the operation of the proximity sensor. If you are not confident in your abilities, it is better to entrust this procedure to professionals, since the risk of damage to the plumes or body if you do not properly open is very high.