How to check the screen on your Xiaomi phone: from broken pixels to the sensor

The screen of a smartphone is not just a display, but the main interface of interaction with the device. Even the slightest defects in the matrix or touch layer can make Xiaomi use of shimmering pixels, uneven illumination, dead zones or distorted colors, and the problems are not always noticeable in ordinary use, they appear only in specific tests or in certain lighting conditions.

In this article, you will learn how to test the screen on a Xiaomi phone without special equipment – using built-in features, third-party apps and even physical tests. We will analyze the diagnosis of broken pixels, assessing the quality of backlight, checking multi-touch and touch response, and give recommendations for interpreting the results.

1. Preparing the phone for screen check

Before you start testing, it is important to properly prepare the device, which will eliminate false positives and improve the accuracy of the diagnosis.

First, charge the battery fully or connect the phone to charge. Some tests (such as checking the backlight at maximum brightness) quickly drain the battery. Second, remove the protective film or glass if installed, which can distort colors and create glare.

• 📱 Turn off adaptive brightness in settings (Settings) → Display. → Adaptive brightness).
• 🌡️ Let the phone heat up to room temperature (cold screen may display colors worse).
• 🔦 Conduct tests in a room with moderate lighting - bright sunlight masks backlight defects.

If you check your phone before you buy it (for example, from hand), be sure to restart it. This will help to identify the “stuck” pixels that may disappear after restarting the system. → The phone. → Version. MIUI — on old firmware, software artifacts not related to iron are possible.

2. Check for broken and "hot" pixels

Broken pixels are dots on the screen that always remain black (don't glow) or, conversely, burn red/green/blue (hot) pixels. They arise from damage to the subpixels of the matrix and can grow over time. AMOLED-On screens (installed in most modern Xiaomi) broken pixels are more noticeable than on the screens. IPS.

Use monochrome screensavers to detect them, and the easiest way to do this is to use the built-in diagnostic mode:

1. Open the phone app and enter the combination: ##6484###
2. Choose the Manual Test → Display (in some firmware, the path may be different).
3. Turn on the tests Red, Green, Blue, Black and White.
4. Carefully examine the screen from different angles – broken pixels can only be seen when tilted.

An alternative method is to use third-party apps, such as the Dead Pixel Test or Screen Test from Google Play, which offer advanced tests, including dynamic patterns to identify stuck pixels. AMOLED-screens (Xiaomi) 13T, Redmi K60) 1-2 bit pixels are allowed according to the manufacturer’s standards, but if there are more of them, this is a reason to replace the matrix.

⚠️ Note: On some Xiaomi models (e.g, POCO F5) There may be no built-in screen test, so use apps from the Play Market or web services like Lagom. LCD Test.

3. Diagnosis of illumination and uniformity of color

Uneven backlighting (called the “cloud effect”) is a common problem. IPS-It's a matrix, especially in Redmi's budget models, and it manifests itself as dark or light spots on a homogeneous background, often visible when you're watching a video or on a white screen. AMOLED-displays instead of backlight check for pixel burnout – when static interface elements (for example, the navigation panel) leave a “shadow” on the matrix.

For the test:

1. Set the screen brightness to maximum.
2. Open any application with a white background (such as Google Docs or a browser with an empty tab).
3. Tilt the phone at an angle of 30-45 degrees - the backlight defects become more noticeable.
4. For AMOLED-Use a burnout test: display a uniform gray color (for example, through Screen Test) and look for blurred contours of static elements.

Permissible standards:

If you burn out AMOLED strong, try to enable the Settings function → Display. → Adaptive color -- it masks the defect by correcting the gamma, but it's a temporary solution: burnout will progress over time.

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To objectively assess the backlight, take a picture of the screen against a white background with another camera (such as another phone) at maximum brightness.

4. Testing of the touch layer and multi-touch

Sensor problems range from random “ghost” touches to completely ignoring presses in certain areas, most often due to damage to the digitizer (touch layer) after falling or getting moisture. On Xiaomi with curved screens (Mi 11 Ultra, Xiaomi 13 Pro), sensor defects often occur at the edges due to mechanical wear.

To verify:

• 🖐️ Single touch test: Open Notes or Drawing and slowly swipe your finger across the screen.The line should be flat, with no passes.
• 👆 Multi-touch test: touch the screen with 5-10 fingers at the same time (depending on the model). All dots must be registered.
• 🔄 Ghost Touch Test: Put your phone on the table and watch for 1-2 minutes. If the screen spontaneously scrolls or opens apps, it is a sign of damage to the digitizer.

Pay special attention to the edges of the screen and the area around the front camera, which is where most problems arise after falls. If the sensor responds only to a strong press, this may indicate that the digitizer plume has detached from the motherboard, a defect that requires disassembling the phone.

5. Checking color reproduction and contrast

Incorrect color reproduction on the Xiaomi screen can be caused by hardware defects (damage to the matrix) and software settings (incorrect color profile). MIUI Some users complain of excessively cold or warm tones to distinguish hardware from software problems:

1. Reset the color settings: Settings → Display. → Color mode → Standard.
2. Turn off all features like Read 2.0 or Vision Protection that affect the gamut.
3. Use test images with gradients and shades of gray, and if you have a good screen, you should clearly distinguish between transitions.

For AMOLED-Checking the black color is critically important:

• 🌑 Open a completely black image (for example, through Gallery).
• 🔦 Light the flashlight at an angle - on the correct AMOLED The screen should be evenly black without lighting.
• 👁️ If gray spots or “glow” are noticeable at the edges, this is a sign of degradation of the matrix.

Nana IPS-screens (Redmi 10, POCO X3) Check the viewing angles: when tilting the phone, the colors should not be distorted much (for example, white should not turn into blue.

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If the color reproduction is distorted only in a certain area of the screen (for example, a pink shade in the corner), it is almost always a hardware defect of the matrix.

6. Checking refresh rate and adaptive synchronization

Modern Xiaomi (starting with Redmi Note 10 Pro and Xiaomi) 11T) Support high refresh rates of 90, 120 or even 144 Hz, however, after drops or updates MIUI This function may not work correctly: the screen "slows down", the frequency jumps or is fixed at 60 Hz:

1. Enable frequency display in the notification panel: Settings → The phone. → Version. MIUI (Tap 7 times on the line, then go back to Settings → Additionally. → Functions laboratory → Show the frequency of the update).
2. Set a fixed frequency: Settings → Display. → Frequency of update → 120 Hz (if available).
3. Use the Refresh Rate Test app to check the actual frequency.

In the models with LTPO-displays (Xiaomi 13, Redmi) K60 Pro) check the adaptive frequency:

• 📊 Enable adaptive synchronization in the settings.
• 🎮 Run a resource-intensive application (such as a game) and watch the frequency – it should automatically increase.
• 📖 Return to the home screen – the frequency should drop to 1-10 Hz (depending on the model).

If the frequency “gets stuck” on one value or the screen twitches when scrolling, this may indicate:

• 🔧 Software failure (will help reset settings or flashing the firmware).
• 🛠️ Hardware damage to the display module (replacement required).

⚠️ Note: On some Xiaomi models (e.g, POCO F4 GT) In game mode, the frequency can be locked at 60 Hz to save charge. It's not a defect, it's a feature of the firmware.

7 Physical screen check for mechanical damage

Even if the screen is visually whole, hidden mechanical defects may occur after a fall or heavy pressure:

• 🔍 Microcracks: inspect the screen under bright light under magnification (you can use a magnifier or another phone's camera in macro mode).Cracks often start from angles or holes in the front camera.
• 💧 Detachment of the matrix: if you press the screen appear "waves" or color spots - this is a sign of detachment of the adhesive layer between the glass and the matrix.
• 🔊 Extraneous sounds: with a light tap on the edges of the screen should not be crunch or creaking - this indicates damage to the internal components.

To check the tightness (relevant after moisture):

1. Place your phone in a silica gel bag for 12 to 24 hours.
2. After extraction, check if there are no dilutions or condensation under the screen.
3. If the moisture indicator (usually under the tray) SIM-The card is red – the screen needs to be replaced.

Note: Xiaomi with Gorilla Glass (e.g. Xiaomi) 12S Ultra cracks can be almost invisible, but the sensor will not work properly, in which case only replacing the glass or a full module will help.

8.When to contact the service: Criteria for critical defects

Not all screen defects require immediate repair, but here are the cases when you should contact the service center:

If the phone is warranty, don't try to repair the screen yourself - this will void warranty obligations. In Xiaomi service centers, replacing the screen is cheaper than in third-party workshops, especially for flagship models. Average prices (for 2026):

• 📱 Redmi Note 12: 3 500–5 000 ₽ (sensor-replacement).
• 📱 Xiaomi 13: 8 000–12 000 ₽ (original AMOLED s LTPO).
• 📱 POCO F5: 4 000–6 500 ₽ (depending on the type of matrix).

When changing the screen in an unofficial service, make sure to use the original matrix - Chinese counterparts often have the worst color reproduction and do not support high refresh rates.

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If the screen is cracked, but the sensor is working, don't delay repairs. Microcracks leak moisture, which leads to corrosion of the plumes and complete failure of the display.

FAQ: Frequent questions about screen check Xiaomi