Xiaomi’s full display check: from broken pixels to sensor – instruction 2026

Why it’s important to check the Xiaomi screen before buying or repairing

The display is the most vulnerable and expensive component of Xiaomi’s smartphone. Even microcracks that are invisible in normal use can eventually lead to detachment of the touch layer or burnout of the backlight. According to service centers, 68% of screen defects are related to hidden damage that was not detected during the initial inspection.

If you are buying a Redmi Note 12, POCO X5 Or Mi 11, check the display should be a must. Even new devices are not immune from marriage: for example, in batches Xiaomi. 13T In 2023, there were instances with uneven backlighting due to build defects. AMOLED-screens (for example, Xiaomi 14) should regularly check the screen for burnout – this type of matrix is prone to degradation over time.

In this article, you will find 5 diagnostic methods, including hidden tests of the engineering menu, which do not require the installation of third-party applications, we will also discuss how to distinguish a software failure from physical damage and when to contact the service.

1. Visual inspection: what can be seen without tools

Start with a basic check in bright light. Take a Xiaomi smartphone and rotate it at different angles to the light source.

• 🔍 Scratches: even minor damage to glass can become a hotbed for further cracks, especially scratches in the area of the chamber or speaker - they often lead to the dissection of the oleophobic coating.
• 💡 Backlighting: On a white background (open notes or browser) check the uniformity of the lighting. Dark spots on the edges are a sign of detachment of the LED tape (a common problem after falls).
• 🎨 Color rendering: Compare the shades on your device to those on another smartphone. Yellow or greenish white may indicate a matrix defect or incorrect screen settings.
• 🔄 Scrolling artifacts: Fast-flick through social media feeds. If stripes, flickering, or "shadows" appear from interface elements, this is a sign of problems with the GPU or display plume.

Pay special attention to the area around the front camera. On models with a cutout (for example, Redmi Note 11) often accumulates dust under the glass, which over time leads to loss of tightness and moisture.

⚠️ Note: If you click on the screen appear colorful spots (especially on the screen). AMOLED), This can be a sign of damage to the matrix. Not to be confused with the yellow spot effect, which occurs when you display static elements (like a keyboard) for a long time, which is burnout, and it's irreversible.

2.Broken pixel test: step-by-step instruction

Broken pixels are dots on a screen that don't change color or that burn in the same color all the time. AMOLED-On screens (for example, Xiaomi 13 Pro) they look like bright dots on a black background, and on the screen. IPS (for example, POCO M5) — dark-colored.

To verify:

1. Go to Settings → Display → Additional settings → Colors and temperature.
2. Select Black mode (or activate Dark Theme and set the black wallpaper).
3. Carefully examine the screen for the presence of glowing dots (red, green, blue).
4. Change the background to white, red, green and blue (you can use this online app). The broken pixels will be visible as points of contrasting color.

On Xiaomi models with AMOLED-Up to 3 broken pixels are allowed by the manufacturer's standards, if there are more, this is an excuse to replace the display under warranty (provided that the defect is not caused by mechanical damage).

Charge the phone at least 50% | Set brightness to maximum | Turn off the screen autoturn | Use a magnifier if necessary

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3. Sensory layer testing: how to identify "dead zones"

Sensor problems range from delayed response to no response in certain areas, such as the Xiaomi Redmi 10, where the sensor is often affected by a defect when the edges of the screen are not working due to poor plume squeezing.

For testing:

• 📱 Use the built-in Test app (available on most Xiaomi models). Runs through the ##4636## set in the phone app, then select Touch Screen Test.
• 🖌️ Swipe your finger across the screen, and if the line is interrupted, it's a dead zone. On high-frequency sensor models (e.g., Xiaomi). 12T — 480 Hz) the test should show a smooth line without jerking.
• 🎯 Check the multi-touch: touch the screen at the same time 5-10 If you don't get any touches, the sensor controller is the problem.

If there is no built-in test, install the Touch Screen Test app from Google Play, which will show the coordinates of the touches and highlight the problem areas.

⚠️ Note: On some models POCO (for example, POCO F4) post-update MIUI 14, when the sensor reacts poorly to touches at the top of the screen, it's a software bug, not a hardware malfunction, and it helps to reset or roll back the firmware.

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If the sensor is running late, try turning off the Smart Assistant feature in the display settings – it sometimes conflicts with the sensor driver.

Diagnostics of illumination and color reproduction

Uneven lighting and distorted color reproduction are common problems, especially after changing the screen. For example, the Xiaomi Mi 11 Lite often features cheap IPS-matrixes with a cold color profile that cuts the eyes.

To verify:

1. Open Settings → Display → Color Mode and select “Standard” (disables all corrections).
2. Run the Lagom test. LCD Test: 🖼️ Gradient: there should be smooth transitions without stripes. 🎨 Color shades: all squares should be clearly different. ⚪ White: should not give yellow or blue.

flash-brightness

light-sensor

Nana AMOLED-screens (Xiaomi 13 Ultra, POCO F5 Pro) pay attention to the gray-to-gray effect (the smoothness of transition between shades of gray). If you scroll through the gray gradients you see stripes or flickering, it is a matrix defect that is only eliminated by replacing the gray gradients.

5. Hidden tests of the engineering menu: what MIUI can do

Xiaomi hides a number of diagnostic tools in the engineering menu, allowing you to test the display at the hardware level, bypassing the limitations of MIUI.

For access:

1. Open the Phone app and type ##3644633## (or #4636## on new models).
2. Select Hardware Testing → Display.
3. Take all the tests: 📊 Color Test: Checking the color rendering. 🔄 Flicker Test: Diagnosis of flicker (relevant to the PWM-brightness-regulation). 🖥️ Touch Test: Advanced Sensor Testing. 🔦 Backlight Test: A test of lighting at different brightness levels.

In the models with AMOLED-screens (e.g. Xiaomi) 12S Ultra, you can use the Burn-in Test on the engineering menu, which shows the burnt out areas, and if the screen shows the ghostly contours of a keyboard or icon, the matrix has deteriorated, and it's going to have to be changed soon.

⚠️ Note: Not all engineering menu tests are safe. POCO X3 Pro, when you start Touch Test through the engineering menu, you may reset the sensor calibration. Always write down the initial settings before testing.

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If the engineering menu is not available, try using the MTK Engineering Mode app (for MediaTek processors) or Qualcomm Service Mode (for Snapdragon).

6.When to contact the service: signs of serious malfunctions

Not all display defects can be repaired on your own, here are 5 signs your Xiaomi needs repairs:

• 💥 Cracks with the “web”: even if the sensor works, microcracks over time will lead to detachment of the polarization layer.
• 🌡️ Spontaneous color change during heating - a sign of damage to the plume or matrix.
• 🔳 Vertical/horizontal bands visible on any background – a defect of a flexible plume or graphics chip.
• 💦 Dilutions under glass (especially after contact with moisture) - the beginning of corrosion of contacts.
• 🔄 The screen flashes when you press the case - a sign of poor contact between the matrix and the board.

The cost of replacing the display varies from model to model:

If your device is warranty, don’t try to repair it yourself – Xiaomi will cancel the warranty if the seals are broken. For models older than 2 years (for example, Redmi Note 9) it is often cheaper to buy a new smartphone than to change the screen.

FAQ: Frequent questions about Xiaomi displays