Many users of Xiaomi smartphones face the need to conduct a thorough screen diagnosis immediately after buying the device or when the first suspicion of matrix defects appears. The inclusion of a solid white image is a classic method of checking for broken pixels, uneven backlighting or the so-called “lights” effect, which is often found in the pixels. IPS-Understanding how to turn on the white screen on your device will allow you to identify a marriage before the warranty period expires or make a decision on returning goods.
Modern gadgets from Xiaomi, Redmi and POCO are built on the Android operating system with the shell MIUI or HyperOS, which offer various tools for testing equipment. However, you will not find a standard “white screen” switch in the usual settings menu, since this feature is hidden in the engineering menu or requires the use of special applications. In this article, we will discuss in detail all the available ways to activate the test mode, from embedded system codes to third-party utilities.
It’s important to note that screen diagnostics aren’t just a way to find a defect, but also a way to make sure the color is correct and bright. If you’re planning on using a smartphone to work with graphics or just want to be sure of the quality of the device you bought, you need to know how to turn on the white screen on a Xiaomi phone correctly. Below are proven methods that work on most of the current models released in recent years.
Using an engineering menu to check the display
The most reliable and quick way to run equipment testing on Xiaomi smartphones is to access the hidden CIT (Customer Integration Test) menu, which is designed for service center employees and testers in the factory, but it is open to all users through a special code. To get there, you need to open the standard Phone application and enter the combination ##6484# in the dialing field. After entering the last digit, the menu should open automatically without the need to press the call button.
Once you're on the test list, you'll see a long list of components on your smartphone, like the camera, speaker, vibrator, and of course the display. You'll need to find a point called White or White Point, which is responsible for bringing white to the full screen. When you click on this point, the device will go into full screen test mode, where you can look at the matrix carefully at maximum brightness. This is the perfect moment to notice any deviations in color reproduction.
In some versions of MIUI firmware, item names may differ or be translated into Russian, so look for options like "White Test" or "Color Check." If the code ##6484## doesn't work, try an alternative combination of ##4636##, which opens the phone information menu, although the testing functionality there may be limited. The engineering menu is a powerful tool, but use it carefully so that important system settings don't accidentally change.
What if the code doesn't work?
Activation of the test through the About Phone menu
There is another built-in way to get into diagnostic mode that doesn't require remembering complex digital combinations, which is especially useful for those who are afraid of getting coded wrong or use a phone with a limited set of call functions. You need to go to the device settings, select About, and find a string with the kernel version or build number. However, on Xiaomi there is a more direct path through the Advanced Settings menu.
Some models, especially global firmware versions, have a Special Features or Developer section where you can find Device Check. But the most versatile method, which works on most MIUI shells, is to go to Settings → About Phone → MIUI version and quickly click on the system logo several times. Although this usually opens the theme menu, certain contextual menus may hide diagnostic access.
However, it is worth noting that there is no direct white screen button in the usual settings, and users often confuse this with color calibration. If you are looking for how to turn on a white screen through a standard menu without codes, then most likely you will have to use third-party software, which we will talk about below, since the manufacturer intentionally hides these functions from the eyes of the average user to prevent accidental changes.
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Before starting the test, be sure to wipe the screen with a soft cloth so that dust and fingerprints are not mistaken for matrix defects.
Application of third-party applications for matrix test
If the built-in methods seem too complicated or inaccessible to you, the easiest solution is to install a specialized application from the Google Play store. There are many free utilities created specifically for checking displays that allow you to display not only white, but also other colors (black, red, green, blue) for comprehensive diagnostics. Popular applications include Screen Test, Display Tester or Dead Pixel Test.
Once you install an app, you just have to run it and choose a solid white mode, and the advantage of third-party programs is that they often have more flexible settings, such as the ability to adjust the brightness independently of the system or output test patterns for a few seconds, which makes the verification process more convenient and informative, especially if you check the device in bright sunlight.
☑️ Screen checklist
When using third-party software, it is important to pay attention to the permissions the application requests. To simply check the screen, the program does not need access to contacts, microphone or geolocation. If you see excessive rights requests, you better refuse to install and choose another, more reputable tool. The security of your data should always be a priority, even when conducting simple hardware tests.
Diagnostics of broken pixels and lights
The main purpose of turning on a white screen is to look for defects that may not be noticeable in normal use of the interface. Broken pixels can manifest as black dots (dead pixels) or dots of another color (stuck pixels) that are clearly visible on a white background. Also, white helps to identify uneven backlighting, when the edges of the screen can glow brighter than the center or have a yellowish/blue hue.
When you look at the matrix, pay special attention to the corners of the display and the area around the front camera, and these are the places where you most often find what's called "clouding," which looks like bright spots that shine through the image, and you may not see them on a black background, but on a white background they become obvious, and if these defects are very difficult to perceive, this can be a reason for replacing the device under warranty.
⚠️ Warning: Don't confuse software artifacts with physical defects.If after a phone reboot, white spots disappear or change shape, it may be a problem in the software or a particular application, rather than in the matrix itself.
In addition to visual inspection, you should pay attention to the behavior of the sensor during the test. Some screen checking apps also have a “Multitouch” mode, which allows you to make sure that the touchscreen responds to touch across the entire area, including the edges. Comprehensive verification will help you to get a full picture of the state of your Xiaomi and avoid unpleasant surprises in the future.
Comparison of Display Checking Methods
The choice of method of verification depends on your goals and level of training. The Engineering menu provides access to hardware tests that accurately reflect the state of components, but require knowledge of the codes. Third-party applications are more user friendly and offer a beautiful interface, but can consume system resources. Below is a table comparing the main characteristics of different approaches.
| Method | Difficulty | Availability | precision |
|---|---|---|---|
| Engineering Menu (CIT) | Medium | Built into the system | Tall. |
| Third-party annexes | Low. | Installation required | Medium |
| Online services | Low. | We need the Internet. | Medium |
| Manual installation of the picture | Low. | File required | Low. |
As you can see from the table, the engineering menu remains the gold standard for quick and accurate diagnostics without the need to install too much software. However, if you plan to do regular checks or want an extended screen status report, installing a dedicated app is a more justified step, the main thing is to use any of these methods immediately after purchase, while the return deadlines are in place.
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The fastest way to check is to enter the code ##6484## in the phone app, it does not require the Internet and install additional programs.
Frequent questions and problems in testing
In the process of diagnosis, users often face questions about whether the detected defect is critical. For example, light light lights on the edges of the screen on IPS-matrixes are considered normal to some extent and are not always a guarantee case. Manufacturers allow the presence of several broken pixels (usually up to 3-5 pieces) if they are not in the center of the screen and are not grouped together.
It is important to understand the difference between OLED and IPS On technology. OLED-The screens used in Xiaomi’s flagship models are the perfect black color, as the pixels are simply turned off. OLED-The displays are more informative to include a black screen, and white is used mainly to find stuck subpixels.
⚠️ Warning: Long-term static picture with maximum brightness can lead to burnout OLED-Don't keep the white screen on longer. 2-3 momentarily.
If you find a serious defect, don't rush to carry your phone to the service yourself. First, take clear photos or video of the defect in good light, which will be your main proof when you go to the store. It's better to record video in high resolution, slowly swiping the camera of another device along the screen to capture all the nuances.