How to check the screen of Xiaomi smartphone for performance: a complete guide with tests

The smartphone screen is the most vulnerable element of the device, which suffers from falls, moisture and even careless use.If your Xiaomi (be it Redmi Note 12, POCO X5 Or Black Shark 5, which is a bug: it flickers backlight, doesn't respond to touch, or displays blurred spots, which is a reason to diagnose. In 80 percent of cases, you can detect problems with the display yourself without having to go to a service center.

In this article, you will find 7 professional tests that Xiaomi engineers use to check screens in production, we will discuss how to identify broken pixels, check the touch layer, assess the uniformity of the backlight and even diagnose hidden matrix defects. All methods are adapted for models from 2020 to 2026 and do not require special equipment, just your smartphone and 10 minutes of time.

Important: If you plan to sell or buy used Xiaomi, this guide will help you avoid cheating, for example, some sellers mask broken pixels with wallpaper or screen dimming, our tests will reveal such tricks.

1. Visual inspection: what can be seen without tests

Start with a basic check that doesn't require running apps or jumping to menus. Take your smartphone in your hands and take a close look at the screen in good light (preferably daylight).

🔍 Scratches and chips: even microscopic glass damage can eventually lead to matrix cracks. Check from different angles - some scratches are only visible in oblique light.
💡 Backlight: Turn on a white background (e.g., a blank page in your browser) bright or dark spots, yellowness at the edges - signs of degradation LED-lighting.
🎨 Color rendering: compare the shades on your Xiaomi device and another device (for example, display the same photo). Too warm or cold shade can indicate a malfunction of the matrix.
🖥️ Artifacts: stripes, flickering, "moir" (wavy pattern) - all these are symptoms of problems with a plume or graphics chip.

Pay special attention to the corners of the screen, where dust often accumulates under the glass after falls, if you notice black dots or sliding, this can be a consequence of depressurization of the display (especially for models with a high-pressure screen). AMOLED-Matrixes, for example, Xiaomi 13 Ultra).

⚠️ Note: If the Xiaomi screen has OLED-matrix (e.g. Redmi) K60 or POCO F5), Don't confuse pixel burnout (natural wear and tear) with broken pixels. The first appears as faint icon silhouettes, the second as bright colored dots.

2.Broken pixel test: how to find "dead" dots

Broken pixels are pixels that are constantly burning in the same color (red, green, blue) or not glowing at all. AMOLED-They are particularly visible on screens, and IPS They can be masked as dirt. Use monochrome screensavers to check:

Go to jscreenfix.com or install the Screen Test app from Google Play.
Turn on the screensavers of red, green, blue, black and white in turn.
Carefully examine the screen from a distance of 20-30 cm Broken pixels will stand out in contrasting color.

For Xiaomi models with AMOLED (for example, Xiaomi 12T) There is a nuance: due to the peculiarities of technology, a small number of broken pixels (1-3 pcs) is considered the norm and is not a reason for replacing under warranty.

Type of pixel	It looks like	Reason.	Can we fix it?
Hot (hung)	It burns constantly in red, green or blue.	Damage to the transistor in the matrix	Sometimes - software "massage" (see spoiler)
Dead.	Always black (not glowing)	Lack of pixel power	No, just a matrix replacement.
Stiff	Changes color, but not in sync with the image	Problems with communication between the pixel and the controller	Possibly with heating/cooling

How to "unlock" a suspended pixel?

In some cases, a hot pixel can be “waked up” by software: 1. Run a video with rapidly changing colors (such as this). 2. Leave it running for 10-12 hours. 3. If the pixel is not gone, try a light physical impact: massage the area gently with your finger (no press!).

AMOLED

IPS LCD

Mini-LED

I don't know.

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3. Touch Layer Check: Why the Screen Doesn't Respond to Touch

If the smartphone doesn't respond to touch or reacts incorrectly (for example, presses the wrong place where you touch), the problem may be in the touch layer or its plume.

Turn off the protective film/glass

Launch the Touch Screen Test (or Settings) → Special opportunities → Sensor test)

Swipe your finger across the entire screen area.

Check multi-touch (simultaneous touching with 2-5 fingers)

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Common symptoms of sensor malfunction:

👆 "Ghostly" touches: The screen itself opens apps or scrolls through pages.
🔄 Delays: 1-2 seconds between touch and reaction.
🧲 Insensitivity zones: part of the screen does not respond (often at the edges).
🔋 Problems after charging: sensor glitching when connected cable - a sign of damage to the plume.

On Xiaomi models with an ultrasonic sensor (such as the Mix 4 or Black Shark 4 Pro), testing is complicated – standard applications may not recognize touch. In this case, use the proprietary Mi Touch Test software, which is available in the service menu (how to get there – see section 5).

⚠️ Warning: If the sensor stops working after falling or getting moisture, don't try to disassemble the smartphone yourself. 90% of the time, the problem is a disconnected plume, and it can be damaged even more without a special tool.

4. Diagnosis of backlighting: why the screen flickers or dims

Uneven lighting is a common problem IPS-Xiaomi screens (e.g. Redmi 10 or X-rays) POCO M4 Pro. It manifests itself as:

🌓 Gradient at the edges: one angle is lighter than the other (especially noticeable on a gray background).
💥 Flickering: Brightness pulsations at 50–200 Hz (may cause headache).
🔦 Backlight "breaks" black: on a dark background, gray spots are visible.

To verify:

Set the brightness to 50-70%.
Open a black background (for example, in the Screen Balance app).
Tilt the screen at an angle of 45.° — The lighting defects will become more noticeable.
Run a flicker test: Open the camera of another smartphone and point it at the Xiaomi screen, and if you see the stripes, the backlight flickers.

Nana AMOLED-screens (Xiaomi 13, Redmi) K50) The flickering may be related to technology PWM-adjusting the brightness to reduce the effect:

Go to Settings. → Display. → Additionally. → Frequency of flickering.
Choose High Frequency (if available).
Or turn on the No-Flicker mode (available on some firmware) MIUI 14+).

💡

If you support Xiaomi DC Dimming (e.g., Dimming, POCO F3 GT), Turn on this option in the screen settings - it replaces PWM-direct current adjustment, eliminating flickering.

Xiaomi hides advanced diagnostic tools in the engineering menu to get there:

Open the Phone app.
Enter the code: ##6484## (for display test) or #4636## (general menu).
Choose Display Test or Screen Test.

The service menu is available tests:

🎛️ Color Test: color rendering test (red, green, blue, black, white).
👆 Touch Test: Touch visualization (shows coordinates and pressing force).
🔄 Flicker Test: Detects the flickering of backlight.
📏 Grid Test: a grid to check the geometry of the screen (distortion, displacement).

For models with AMOLED (For example, Xiaomi 12 Pro, you can have an additional Burn-in Test on the menu, which shows the burnt out areas. If you see the silhouettes of the keyboard or icons, the matrix is worn out.

⚠️ Note: Not all codes run on custom firmware (like LineageOS or Pixel Experience). MIUI Global, some tests may be blocked – in this case, use third-party apps like Phone Doctor Plus.

6. Check after falling or ingressing moisture

If the smartphone fell or came into contact with water, the screen may have hidden damage that will show up later.

Check the integrity of the glass (even microcracks are dangerous!)

Run the sensor test (see Section 3)

Look at the screen under the magnifying glass - look for divorces under the glass

Check the color rendering (compare with another device)

Connect charging - if artifacts appear, the plume is damaged

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Signs of damage after moisture:

💧 Blurred spots under glass (liquid crystal screens) IPS vulnerable).
🔥 Overheating in the screen area (feels like your hand).
🖼️ Image distortion (for example, straight lines become wavy).
🔌 The screen flashes when connecting charging.

If Xiaomi fell into the water, but everything looks fine:

Turn off the device immediately.
Place it in a silica gel (or rice) bag for 24 to 48 hours.
Do not turn on until you make sure there is no moisture inside (check the moisture indicator in the tray for SIM-map).
After drying, check the screen for artifacts – they can appear in 1-2 days.

💡

If Xiaomi's screen starts to show pink or green after the crash, it's a sign of damage to the matrix plume, in which case self-repair is not recommended - soldering equipment is required.

7.When to contact the service: critical symptoms

Not all screen problems can be solved by yourself. Contact Xiaomi Service Center if:

🔧 The screen is completely black, but the smartphone makes sounds and vibrates (probably the plume has gone away or the controller has burned down).
🔥 There are vertical/horizontal bands that do not disappear after rebooting.
💥 Matrix "melting": the image is distorted as if the glass is melted (defect) AMOLED-screen).
🔌 The sensor only works in certain areas (for example, only in the upper half).
📉 The brightness spontaneously changes (symptom of a malfunction of the illumination sensor or the illumination controller).

The cost of Xiaomi screen repair in 2026:

Model	Screen type	Cost of replacement (original), ₽	Cost of replacement (analogue), ₽
Redmi Note 12	AMOLED, 120Hz	12 000 – 15 000	7 000 – 9 000
POCO X5 Pro	AMOLED, 90 Hz.	10 000 – 13 000	6 000 – 8 000
Xiaomi 13 Lite	AMOLED, 120Hz	18 000 – 22 000	10 000 – 12 000
Redmi 10C	IPS LCD, 60 Hz	6 000 – 8 000	3 500 – 5 000

If your Xiaomi warranty, do not disassemble it yourself - this will void the warranty. mi.com/ru/service. Average screen repair time — 3–7 days.

FAQ: Frequent questions about screen check Xiaomi

❓ How to distinguish a broken pixel from dirt on the screen?

The broken pixel is visible against any background and does not erase when you wipe the screen. The dirt is usually visible only at a certain angle and disappears after cleaning with a microfibre wipe. To make sure you run a test for a uniform color (for example, white) - the broken pixel will stand out contrastingly.

❓ Why Xiaomi’s screen itself clicks on the icons?

This is called phantom touches, and can be caused by: Touch layer damage (like falling); CPU overheating (often when playing heavy games); plume failure (if the problem is exacerbated by bending the phone); moisture coming under the screen. For a temporary solution, disable the Settings option → Additionally. → Sensitivity of touch (if available).

❓ Can I replace the screen on Xiaomi?

Theoretically, yes, but: AMOLED-screens (Xiaomi) 12/13, Redmi K50) It requires software binding of the new matrix to the motherboard (without this, autobrightness and True Tone will not work). 4, Black Shark, you need to calibrate the sensor after you've replaced it. IPS-screens (Redmi) 10, POCO M4) Replacement is easier, but requires care when disconnecting the plumes. If you do not have experience, it is better to contact the service - errors in replacing can lead to damage to the motherboard.

❓ Why there are rainbow divorces on the Xiaomi screen?

This is a sign of delmination, the layer of glue between the glass and the matrix, most often after: bumps or falls; sudden temperature changes (for example, if you leave your phone in the cold and then put it in a warm room); poor screen replacement (used cheap glue); this can only be corrected by replacing the glass or the entire screen module; the temporary solution is to reduce the brightness so that the divorces are less noticeable.

❓ How to check the Xiaomi screen for burnout (burn-in)?

Burnout is characteristic of AMOLED-It shows up as dim silhouettes of commonly used elements (keyboards, navigation bars, icons) to check: Set brightness to 100%. Open a uniform gray or red background (for example, in the application). AMOLED Burn-in Test. Take a close look at the screen - the burnt-out areas will be darker. AMOLED (Like Redmi. K40) You can enable the option Settings → Display. → Pixel Shift – It masks burnout a little, shifting the image by 1-2 pixels every few minutes.