How to check the screen on your Xiaomi smartphone: from broken pixels to touch lags

Why it’s important to check the screen of Xiaomi smartphone regularly

The screen is the most vulnerable part of any smartphone, and Xiaomi devices (be it Redmi Note 12, POCO X5 Even minor defects — broken pixels, uneven lighting or sensor hanging — can eventually escalate into serious problems, from eye irritation to complete display failure, such as one dead pixel per sensor. AMOLED-The screen often signals the incipient degradation of the matrix, and ignoring microcracks under the protective glass leads to the spread of damage to the display itself.

The manufacturer guarantees screen replacement only in case of critical factory defects (for example, mass broken pixels or plume detachment), but users miss most problems in the early stages.

🔍 Identify hidden defects before the warranty expires (on most Xiaomi models, it is 12 months).
💰 Save on repair: the screen replacement on Redmi 10 costs 5-8 thousand rubles, and on Mi 13 Ultra – up to 25 thousand.
⚡ Preventing deterioration: for example, yellow spots on the AMOLED They are often associated with overheating, and their early detection saves the matrix.

In this article — 5 Xiaomi’s working screen screen testing methods (including hidden engineering menu tests) that do not require root rights or special equipment. MIUI 12–14 HyperOS, including budget Redmi and premium Mi/Mix.

📊 How often do you check your smartphone screen?

Never checked.

Six months

Before sale/purchase

Only if I notice problems.

Method 1: Visual inspection – what to look for on the screen Xiaomi

Start with a basic diagnosis in bright light. Take a smartphone (for example, POCO F5 Or the Redmi Note 11 Pro, and carefully examine the screen from different angles:

🖥️ Broken pixels: black (dead) or colored (hanging) dots that do not change when scrolling the screen. AMOLED-displays (Mi 11, Mi 12).
🌈 Divorces and spots: yellowness at the edges (backlight defect), greenish hue (matrix problem) or purple stripes (damage to the plume).
🔦 Uneven backlighting: on a white background (open "Notes") you can see dark clouds or light spots - a sign of detachment of the LED film.
📱 Microcracks: Even if the glass is whole, there may be hair cracks underneath that will grow over time!).

For accurate analysis, use a white background: open any text editor or web page (such as google.com) and set the brightness to 100%. AMOLED-On the screens (Mi 13, Mix Fold) also check the black background – broken pixels will be more noticeable.

⚠️ Note: If the Xiaomi screen appears horizontal stripes when scrolling or flickering at low brightness - this is a sign of a malfunction of the plume or display controller.

💡

To enhance contrast and identify hidden defects, turn on Reading mode in the settings (in Settings). → It turns off the blue spectrum and makes the spots more visible.

Method 2: Testing broken pixels with built-in tools MIUI

Xiaomi hides in the firmware MIUI/HyperOS It's an engineering menu with display tests that don't require third-party applications, and it works on all models, including Redmi. 9, POCO M4 mi 11 Lite, follow the instructions:

Open the phone app and enter the combination: ##6484###
There will be a menu on the screen. MIUI Select Display Test (or Screen Test in Russian).
Pass all color tests (red, green, blue, black, white) and carefully examine the screen for defects at each stage.
To check the sensor, select Touch Test and swipe your finger across the surface – the line should repeat the trajectory without delay.

If there is no Display Test item in the engineering menu, try the alternative code:

##284##

Color of dough	Checks	Signs of defect
Red.	Color reproduction of subpixels	Green/Blue Dots – Broken Pixels
Green.	Performance of green subpixels	Pink or black dots
Blue	Blue subpixels and backlighting	Yellow spots - defect of illumination
Black.	Broken pixels on AMOLED	Colored dots are "hot" pixels
White	Unevenness of illumination	Dark spots - film detachment

⚠️ Note: On some models (POCO X3, Redmi Note 10: The engineering menu may be missing or require a password. In this case, use the side of the application (see Method 3).

Turn off autobrightness|Charge your phone at least 50 times%|Remove the cover and protective film|Check in the dark room.-->

Method 3: Applications for deep screen diagnostics

If built-in tests MIUI They didn't show any problems, but you suspect hidden defects, install one of the specialized applications, and they offer advanced checks, including a burn-in test for the use of a computer. AMOLED-screens and sensor response time analysis.

Top.-3 apps:

📱 Screen Test (by Keuwlsoft) – 15 color tests + Multi-touch check (up to 10 touches at a time) is suitable for Redmi and POCO s MIUI 13+.
🔍 Display Tester analyzes the gamma curve, contrast and uniformity of the backlight).
🛠️ Phone Check and Test is a comprehensive utility that, in addition to the screen, checks the battery, speakers and cameras.

How to use (as an example of Screen Test):

Download the app from Google Play (link: https://play.google.com/store/apps/details?id=com.keuwl.screen).
Start and select the Color Test. Scroll through the color fills while holding the screen in a horizontal position.
To check the sensor, go to Touch Test and swipe your fingers diagonally – the lines should be smooth, without tears.
In the Burn-in Test section, for AMOLED) Turn on the red background for 10 minutes – if there are traces of the interface, the matrix degrades.

Nana AMOLED-screens (for example, Mi 12 Pro or Mix 4) even 1-2 “burned out” pixels in place of the status bar or navigation panel – an excuse to contact the service center under warranty.

What if the app doesn’t see broken pixels?

Sometimes broken pixels only appear at a certain screen temperature. Try: 1. Heat the phone in your hands for 5-10 minutes (do not use external heat sources!). 2. Repeat color tests - defects can become more noticeable. 3. If the pixels only appear at low brightness, check the screen in a dark room with a brightness of 20-30%.

Method 4: Touch screen check for lags and dead zones

Sensor problems on Xiaomi are manifested in different ways, from random taps to completely ignoring touches in certain areas (often at the edges of the screen).

Open the engineering menu (code ##6484##) and select Touch Test.
If the menu is not available, use the Touch Screen Test app (com.ts.test in the Play Market).
Swipe your finger across the entire screen surface: 🔘 The line must repeat the trajectory without rupture. 🕳️ If the line is broken, it is a dead zone". ⏱️ The delay between touch and reaction >0.2 sec - sign of lags.

multitouch

Typical sensor problems on Xiaomi:

📵 "Ghost presses - the screen opens the applications itself, often caused by damage to the plume or moisture (relevant to the application). POCO X3 Pro after falls).
🔄 Hanging when scrolling - a sign of a software conflict (helps reset settings) or wear of the touch layer.
🧲 Part of the screen is not working, such as the right edge on the Redmi Note 11.

⚠️ Note: If Xiaomi’s sensor stopped working after the update MIUI, Try to retrace the previous version via Fastboot. → The phone. → Version. MIUI (tap 7 times to unlock the developer mode, then additionally → Update and restoration.

💡

If the sensor responds only to a strong press, the problem is the wear of the touch layer. On Xiaomi models older than 2 years, this is a common phenomenon - a touchscreen replacement is required (cost: 2-5 thousand rubles).

Method 5: The burn-in test for the AMOLED-screen

AMOLED-Displays (installed in Mi 11 Ultra, Mix Fold 2, POCO F4 GT) Over time, they lose color uniformity due to degradation of organic LEDs, which manifests as "shadows" from static interface elements (notification panels, keyboards:

Download the app AMOLED Burn-in Test (com.amoled.burnin).
Choose a test with a red background (most sensitive to burnout).
Look at the screen from an angle of 45.° — The interface tracks will be visible as fainter areas.
For accurate diagnosis, enable Invert Colors mode in the special features settings (Settings) → Special opportunities → Color filter).

Signs of severe burnout:

📱 You can see the outlines of the keyboard, icons or logo MIUI homogeneous.
🔴 Red/green at the bottom of the screen (typical for the screen) POCO F1 After 2-3 years of use).
🌡️ Brightness in the center of the screen is higher than at the edges (uneven degradation).

What to do if burnout is detected:

🔄 Enable automatic wallpaper change (in Settings) → Wallpaper) – this evenly distributes the load on the pixels.
🕒 Reduce the time of displaying static elements: turn off Always-on Display (Settings) → Screen. → Always-on).
🛠️ On models with warranty (< 12 months) contact the service – Xiaomi replaces the screen in critical burnout.

💡

To slow down burnout. AMOLED, Set a dark theme (Settings) → Screen. → Dark theme) and reduce screen auto-turndown time to 15 seconds.

What to do if screen defects are found

Find broken pixels, spots or broken areas of the sensor?

Type of defect	Guarantee.	No guarantee.	Cost of repair (approximately)
1-2 bit pixels	Replacement of the screen under warranty (if the defect is factory)	Ignoring or living with a defect	—
Sensor dead zone	Free touchscreen replacement	Replacement of touchscreen (2-5 thousand rubles)	2 000–5 000 ₽
Yellow spots/divorces	Replacement of the screen (backlight defect)	Replacement of the screen (5-15 thousand rubles)	5 000–15 000 ₽
AMOLED burnout	Screen replacement (if critical)	Replacing the screen or selling the phone	8 000–25 000 ₽
Cracks/broken glass	Not covered by the guarantee	Replacement of glass (1-3 thousand rubles) or module (5-20 thousand rubles)	1 000–20 000 ₽

How to contact the Xiaomi service:

Take screenshots/photos of defects (for broken pixels, use macro mode).
Find the nearest authorized service center on the site https://www.mi.com/ru/service/.
Check by phone if you need an entry. In some centers (for example, in Moscow or St. Petersburg) queue for 1-2 weeks.
Take checks, box and equipment with you - without them, warranty repairs may be denied.

⚠️ Note: If you have disassembled your phone yourself (for example, changed the battery to Redmi). 9A), The service center has the right to refuse warranty repairs to the screen, even if the defect is not related to your actions!

FAQ: Frequent questions about screen check Xiaomi

Can I check the screen for broken pixels without apps?

Yes, use the built-in engineering menu (code ##6484##) or simply open a white background (like in Notes) and carefully examine the screen. Broken pixels will be visible as colored or black dots that do not change when scrolling.

On screen. POCO X3 So, you've got horizontal bands. It's a software or hardware defect?

Horizontal bands (especially green or purple) usually indicate damage to the plume or screen controller. Try rebooting the phone — if the bands are left, carry to the service. Exception: if the bands only appear in games, the problem may be in the GPU driver.

How to distinguish a crack under the protective glass from a crack on the screen itself?

Put your nail over the supposed crack: If you feel a physical gap, the glass cracks. If the surface is smooth, but you see the line, there's a crack under the glass (risk of spreading to the display!) AMOLED-The crack under the glass often appears as a black wavy line that expands over time.

After the Redmi Note 11 crashed, the screen started to flicker at low brightness.

It's a typical symptom of plume damage or backlight detachment (<30%) Solutions: Try calibrating the screen through the engineering menu (code ##36446337##, If it doesn't work, take it to the service. Self-repair can make the problem worse. Attention: The flickering can increase over time and cause the screen to fail completely!

Should I change the screen if there is one yellow spot on the Mi 11 Lite?

Depending on the cause: If the spot appeared on its own (without falls) - it is a defect of the backlight. The guarantee screen will be replaced for free. If the spot appeared after mechanical impact (impact, compression) - it is most likely detachment of the LED film. Repair will cost 5-10 thousand rubles. Single spot is not critical for work, but over time can grow.