How to Check Xiaomi’s Phone Screen for Broken Pixels: The Complete Guide

Broken pixels on a smartphone screen are a common problem that can manifest itself immediately after purchase, and after several years of use. POCO And the matrix defects often go undetected until they start to spoil the image, like black dots on a light background, colored spots, or flickering areas. AMOLED-screens, where each pixel is responsible for its color, and the failure of even one element is striking.

In this article, you will learn how to check your phone screen for broken pixels without having to use a service center. We will look at both built-in MIUI tools and third-party applications, and give recommendations for interpreting the results. It is important to understand that some defects can be software (hang pixels) and others hardware (physical damage to the matrix), and we will understand how to distinguish them and what to do in each case.

What are broken pixels and why do they appear?

A broken pixel is a screen element that has stopped displaying color correctly, and depending on the type of damage, it can:

• 🔴 Burn red/green/blue – a “hung” pixel that is constantly on.
• ⚫ Staying black is a dead pixel that doesn’t respond to signals.
• 🔄 Blinking or flickering – unstable operation of the transistor.

Causes of defects:

• 🛠️ Physical damage: falls, bumps, pressure on the screen (for example, if the phone was lying down on a hard surface).
• ⚡ Voltage changes: unstable power supply when charging or sudden jumps in the network.
• 🕒 Natural wear: y AMOLED-pixels degrade over time (burnout effect").
• 📦 Manufacturer's marriage: defects that occurred during the assembly stage (more often found on budget Redmi models).

Nana AMOLED-screens (for example, in Xiaomi 13 Pro or POCO F5 Pro) broken pixels are more visible than on IPS (Like the Redmi Note 12, because of the technology. AMOLED Each pixel is individually illuminated, so the damaged element contrasts with the others. IPS defects can be masked by illumination, but become visible on monochromatic backgrounds.

⚠️ Note: If broken pixels appeared after a phone drop or moisture hit, do not try to "overclock" them programmatically - this can aggravate damage to the matrix.

Preparation of the phone for inspection

Before testing the screen, follow a few simple steps to ensure the results are accurate:

Set brightness to 100% | Turn off adaptive lighting |Close all apps |Remove protective film (if any) |Rub the screen with a dry wipe-->

Why it matters:

• 🌞 100% brightness – allows you to see even mild defects, especially on the AMOLED-display.
• 🔄 Disabling adaptive lighting (in Settings) → Display. → Brightness prevents automatic contrast change.
• 📱 Closing applications eliminates the overlay of notifications or widgets on test colors.
• 🧴 Clean screen – dirt or scratches on protective glass can mimic broken pixels.

If you are using Xiaomi with Always-On Display (e.g. Xiaomi 14 or POCO X6 Pro), disable this feature in Settings → Lock screen → Always-On Display. Constantly active pixels in AOD mode can distort the results of the backlight uniformity test.

Never.|Once a year.|Before the phone sale|After the fall/hit|Other-->

Method 1: Integrated screen test in MIUI

Xiaomi has a hidden screen diagnostic tool that is available on most models without installing additional apps, a method that is suitable for phones based on MIUI 12 and later (including HyperOS).

To run the test:

1. Open the Phone app.
2. Enter the combination: ##6484## (or ##MIUI### on some firmware).
3. Select Display Test (or Screen Test in Russian).
4. Consistently check the display of primary colors: red, green, blue, black and white.

At each stage, carefully examine the screen from different angles, and the broken pixels will be visible as contrasting points:

• On a black background, there are light or colored pixels.
• On the white background, there are black dots.
• On colored backgrounds – pixels of a different shade (for example, green on a red background).

⚠️ Note: Some Xiaomi models (e.g. Redmi) 10C or POCO M5) code ##6484## may not work. In this case, use an alternative method: go to Settings → The phone. → Version. MIUI And then you tap 5 times on the line with the build number, and then you'll see "Equipment Test" on the menu".

💡

Built-in test MIUI — The fastest way to check, but it does not always reveal the "hang" pixels on the AMOLED-Use third-party apps for accurate diagnosis.

Method 2: Screen checking applications

If the built-in tools don't give a clear picture, use specialized utilities, which offer advanced tests, including checks for gradients, flickering and uniformity of the backlight.

How to use:

1. Install one of the applications and open it.
2. Select the check mode (e.g., "Monochrome Tests" for single-color backgrounds).
3. Look at the screen from different angles, paying attention to anomalies.
4. For AMOLED-Turn on the Black Screen Test mode - it will help to identify even faintly glowing pixels.

On phones with high refresh rates (120Hz, 144Hz), some apps may show flickering - this is normal and does not indicate matrix defects.

💡

If you notice a broken pixel on a new phone (in the first 14 days after purchase), contact the store for a replacement under warranty.Manufacturers consider the norm to be up to 3 bit pixels per million, but in Russia there are stricter return standards.

Method 3: Manual inspection by means of images

If you don’t want to install apps, you can use test pictures, which is a method that works for Xiaomi with any type of screen, but takes longer.

Download the archive with test images (e.g., from here) and follow the following steps:

1. Unpack the archive and transfer the files to your phone.
2. Open the gallery and start viewing in full screen mode.
3. Take a look at it: 🟥 Red background 🟩 Green background 🟦 Blue background ⚪ White background ⚫ Black background 🌈 Gradient crossings

If you find defects, take a picture of them (from another device) for fixation.

The advantage of this method is that it can be checked anywhere without the Internet, but it is less accurate than specialized utilities, because it does not take into account the features of the backlight. AMOLED-screen.

Method 4: Computer Verification (for advanced users)

This method is suitable for those who want to check the screen Xiaomi with maximum accuracy, for example, before selling a phone. ADB (Android Debug Bridge).

Instructions:

1. Turn on Developer Mode on your phone: go to Settings → About Phone → MIUI version and tap 7 times on the line.
2. Activate USB Debugging in Settings → Additional → For developers.
3. Connect the phone to your PC and start the command: adb shell service call SurfaceFlinger 1035 i32 0 This command translates the screen into a display mode of uniform color (by default - red).
4. To change color, use the values: 1 - green 2 - blue 3 - black 4 - white

Example: Adb shell service call SurfaceFlinger 1035 i32 1

adb shell service call SurfaceFlinger 1035 i32 6

This method bypasses application limitations and tests the screen at a low level, but it requires ADB skills and can be dangerous if used incorrectly (for example, if you interrupt a command during runtime).

⚠️ Attention: Do not use ADB-commands on phones with unlocked bootloader and custom firmware, which can cause malfunctions in the graphics driver.

What to do if you find broken pixels

What you do depends on the situation.

For temporary "treatment" of hung pixels:

1. Open JScreenFix on your phone.
2. Drag the flashing square to the defective pixel.
3. Leave it to work for 10 to 30 minutes.

That is why Xiaomi with AMOLED (such as Xiaomi 14 Ultra) undergo stricter quality control in production.