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

Modern Xiaomi, Redmi and Poco smartphones are equipped with high-quality displays, but even flagship matrixes can have manufacturing defects. A broken pixel is a tiny dot on the screen that does not change color or glows incorrectly, which is especially noticeable on monochromatic backgrounds. Device owners often face the need for rapid diagnosis after buying or when suspicious artifacts appear during operation.

In this article, we will discuss in detail all the available ways to check the display for defects, from simple visual methods to using the MIUI engineering menu. You will learn how to distinguish "dead" points from "hot", how to run a factory test without installing third-party software and whether you can try to repair damaged areas yourself. Understanding these nuances will help you contact the service center on time or return the device under warranty.

What are broken pixels and what are they?

A smartphone display consists of millions of microscopic dots, pixels, each of which is formed by three subpixels: red, green and blue (RGB). When one of these elements or the transistor that controls it fails, a defective image appears on the screen. It is important to distinguish between the types of malfunctions, since the methods for fixing them are radically different.

Dead pixels are black dots that don't light up at all. This happens when the transistor stops passing current to the subpixel. Unfortunately, software can't repair those areas, because the damage is physical, and if you notice one or two of those dots in the corner of the screen, they may not be immediately visible in everyday use, but with a bright white background, they become apparent.

By contrast, hot pixels glow bright white, red, green, or blue all the time, regardless of what is on the screen, often confused with stuck pixels that have been locked in the same color but can theoretically be restored, and these are often managed through special programming cycles of rapid color change.

⚠️ Warning: Screen manufacturers allow for a certain number of broken pixels (usually up to a maximum of two). 3-5 which is not considered marriage by the standards ISO 13406-2. Xiaomi’s policy may vary from region to region, however: in some cases, even a single bright hot pixel in the center of the screen is the basis for replacing the device.

Visual inspection and preparation of the device

Before starting complex diagnostic tools, you need to make a basic visual assessment of the state of the display, which requires maximum brightness of the backlight and clear the screen surface of fat spots and dust that can mimic matrix defects. Use a soft microfiber to wipe so that you do not damage the oleophobic coating.

Search the internet or create multiple images of solid color yourself: white, black, red, green and blue. White backgrounds are best at spotting black dead spots, while black backgrounds are ideal for detecting burning white or colored pixels. Colored backgrounds (red, green, blue) help find stuck subpixels of other colors that merge with the main image.

The sequence of actions during manual inspection shall be as follows:

• 🔍 Enable maximum brightness in the notification curtain or through Settings → Screen.
• 🖼️ Open the prepared monochromatic image to the full screen.
• 👀 Carefully examine the surface from different angles, slowly turning the smartphone.
• 🔄 Repeat the procedure for each of the primary colors (RGB) and white/black.

If you don't see the obvious points in this survey, it doesn't guarantee that they're not there, and some defects only occur when the matrix is heated or after a long period of work. 10-15 minutes, changing colors to warm up the display.

Using the CIT Engineering Menu for Diagnostics

Android’s MIUI or HyperOS operating system has a powerful hardware testing tool, the Customer Integration Test (CIT) menu, designed for service engineers, but also available to regular users, that allows you to check not only the screen, but also the sensor, speakers, cameras and other modules without installing unnecessary applications.

There are several ways to enter the engineering menu, depending on the specific model and version of the firmware, the most universal method is to use a special code in the Phone application. Open the dial and enter the combination ##6484#. If the code is entered correctly, the system will automatically redirect you to the test menu.

##6484##

In the list that opens, find the item associated with the display. It can be called Display, Screen, LCD or Video. Once you select this item, you will run an automatic test that will consistently color the screen in different colors. Your task is to closely monitor the surface and look for anomalies. In some versions of MIUI, you also have a touchscreen test, where you need to draw lines with your finger to check the responsiveness of all zones.

An alternative login method is available through standard system settings if the code does not work:

1. Go to Settings. → The phone.
2. Find the kernel version or MIUI version.
3. Quickly click on this line 5-7 times in a row.
4. A hidden CIT menu will open where you can select a screen test.

Online services and specialized applications

If the built-in tools don't seem informative enough or the CIT menu interface is too complex, you can use third-party solutions. There are many free apps on Google Play that specialize in screen diagnostics. They create the perfect environment for detecting defects by generating clean colors without the compression artifacts that are typical of conventional images.

One popular solution is the Dead Pixel Test or Screen Test app. Once installed, run the program and select full screen mode. The app will cycle around the color, allowing you to safely walk around the room or use a magnifying glass for a detailed inspection. The advantage of such programs is that they often have a zoom feature that zooms in the screen to better consider the suspicious point.

There are also online services like JScreenFix that work right in the browser. You don't have to download anything: just go to the site, run the test, and open the full screen window. This is a great option if you don't want to clog up your smartphone memory with unnecessary programs. However, remember that the browser may not display colors with the same accuracy as native apps, due to the peculiarities of page rendering.

Can you recover broken pixels software

Smartphone owners often wonder if you can fix the screen without going to the service? The answer depends on the type of defect. If the pixel is dead (black), the odds are close to zero because the control transistor has burned. But if the pixel is stuck in one color, there is a method based on rapid color change that sometimes helps bring the subpixel back to life.

The method is to send rapidly changing color signals to the problem area of the screen, which creates a kind of shake-up for liquid crystals, causing them to come out of a jammed state, using special video files or applications that generate noise and flickering, a process that can take from 10 minutes to several hours.

A popular algorithm for trying to recover:

• 📹 Find YouTube videos for “dead pixel fix” or “broken pixel treatment».
• 🔊 Make sure the sound is turned off as the video contains high-frequency noise.
• ⏱️ Run the video on the full screen and leave the smartphone on 1-3 hour.
• 👁️ Check the results periodically, but do not interrupt the process before the time.

⚠️ Warning: Prolonged screen operation at maximum brightness with rapidly changing colors leads to strong heating of the device and accelerated wear of the matrix. Do not leave the smartphone unattended on fire-prone surfaces and monitor the temperature of the case. If the phone starts to overheat, interrupt the procedure.

It is important to understand that this method is not more than 60-70% effective and only works in fresh cases of stuckness. If the defect has appeared long ago or is caused by physical shock / pressure, software treatment is likely not to help.

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Software recovery is only effective for stuck pixels, but is useless for physically damaged dead zones.

Warranty cases and return of the device

If you find a defect on a new Xiaomi, Redmi or Poco smartphone, the most sensible step is to try to return or exchange the device under warranty. According to the law on consumer protection (in Russia and many CIS countries), good quality goods can be returned within 14 days, but technically complex goods (which include smartphones) are returned only if there is a malfunction.

The presence of broken pixels is such a malfunction. However, the ISO standard mentioned earlier, which allows a certain number of defective points, usually service centers recognize as a marriage the presence of more than 5 dead or hot pixels, or their accumulation in the center of the screen (active zone), the exact number of allowed defects depends on the class of the matrix and the policy of the particular service center.

What to do when finding a marriage:

1. Take high-quality photos of the defect in good lighting.
2. Keep the check, warranty card and packaging (preferably).
3. Contact the Xiaomi Purchase Store or Authorized Service Center.
4. Write a statement about conducting a diagnostic check.

If more than 15 days have passed since the purchase, you will be offered free repairs, if the repair is impossible or takes too long (more than 45 days in total), you have the right to demand a replacement of the device or a refund.

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When you hand over your phone to the service, be sure to make a copy of all important data and reset the device to factory settings to protect your personal information. Take a picture of the IMEI code on the box and in the settings before transferring the device.

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