Introduction: Why is it necessary ITO test on Xiaomi smartphones
If you have ever faced touch screen problems on Xiaomi – “dead zones”, spontaneous taps or complete failure of the touch screen – then you have probably heard about the so-called “dead zones”. ITO It's a diagnostic tool built into the brand's smartphone engineering menu that allows you to test the integrity of the touch layer of the display, but what exactly is behind this acronym and why the test has become so popular among users and repairmen?
ITO (Indium Tin Oxide is a transparent conductive material based on indium tin oxide that is applied to the inner surface of the touch screen, and it is responsible for recording your touches. When that layer gets damaged – whether due to a fall, factory defect or wear and tear – the screen begins to behave unpredictably. ITO The test is designed to identify such defects by visualizing them in the form of colored lines or spots on the screen during the inspection.
It's important to understand that this test is not a universal solution for all display problems, it's only effective for diagnosing physical damage to the touch layer, but it won't help if the fault is in the plume, the controller, or the software. ITO The test begins any professional screen repair Xiaomi, Redmi or POCO.
How it's deciphered. ITO And why is it important for the screen?
abbreviation ITO It comes from the English word Indium Tin Oxide, which is indium tin oxide:
- 🔹 Transparency – transmits up to 90% of light without interfering with the display of the image on the screen.
- 🔹 Electrical conductivity – allows you to record the touch of your fingers.
- 🔹 Thinness of the layer – the thickness of the coating is only a few nanometers.
This combination of characteristics makes ITO But it also has a weak spot: fragility. Even a minor mechanical impact (like a phone falling a corner) can cause microcracks in the conductive layer. These cracks are not always visible to the naked eye, but they disrupt the electrical circuit, causing part of the screen to stop responding to touch.
That's why. ITO So the test is so important, it converts electrical signals from the touch layer into a visual map, where the damaged areas are shown as breaks or distortions of lines, and it allows you to precisely localize the problem without disassembling the device. For example, if a vertical bar appears on the screen that does not respond to touches, ITO The test will show the gap in this particular place.
When to launch. ITO Xiaomi test
There are a few obvious signs at which it is worth immediately conducting a diagnosis of the touch screen:
- 📱 Dead Zones – Part of the display does not respond to touch, although the image is displayed normally.
- 👆 Spontaneous taps – the phone opens apps or scrolls pages on its own.
- 🔄 Inaccurate touches – touches are not recorded where you touch (e.g. 1 cm to left).
- 🔳 Sensor freezes – the screen periodically “freezes” and does not respond to commands.
Also. ITO The test is recommended to be run in the following situations:
- 🛠️ After a fall or a heavy hit of the phone (even if the screen is intact).
- 🔧 Before buying a used Xiaomi smartphone to check the status of the display.
- 📦 After changing the screen in the service center (to ensure the quality of the installation).
Note: if sensor problems have occurred after the firmware update, ITO It's probably not going to work, and it's the software, not the hardware, that's the fault. MIUI or reset the settings.
⚠️ Warning: If the screen has completely stopped responding to touch, start ITO This will not work through the standard menu, in which case you will need to connect to a PC and use special utilities (for example, Mi Flash Tool) or navigate to the engineering menu through the hardware buttons.
Step-by-step instructions: how to start ITO Xiaomi test
There are two main ways to run a test: through the engineering menu and with the codes, and we'll look at both.
Method 1: Engineering menu (for most models)
This method works for most Xiaomi, Redmi and other smartphones. POCO:
- Open the Phone app.
- Enter the combination: ##3644633## (or #36446337## for some models).
- The CIT (Continuous Integration Test) menu will appear on the screen.
- Select a point. TP Test or Touch Panel Test.
- In the window that opens, tap on ITO Test.
And then you'll see a grid of colored lines on the screen, and your job is to look at it carefully for any breaks or distortions.
Method 2: Through a Hidden Menu (alternative)
If the first method didn’t work, try this one:
- Go to Settings. → The phone.
- Find the item Version. MIUI and tap it 7 times in a row to activate the developer mode.
- Return to the main settings menu and open Additional → for developers.
- Activate the debugging option via USB.
- Connect your phone to your PC and type in the command line: adb shell am start -n com.android.settings/.DevelopmentSettings
- In the menu that opens, find the Hardware Test section and select TP Test.
If neither of these methods worked, your Xiaomi model may be using a different method of accessing the test, in which case, try looking for instructions specifically for your device (please specify the full model name, for example, Redmi Note 10 Pro).
Make sure the screen is clean (dust and fat can distort the results)
Connect your phone to charge (the test drains the battery)
Close all background applications
Do not press the screen during the test (this can knock the results down)-->
How to interpret the results ITO test
When you run the test, you'll see a grid of horizontal and vertical lines of different colors (usually red, green and blue) and you'll have to look at this image carefully, and this is what the artifacts mean.
| Visual defect | What does it mean? | Recommendations |
|---|---|---|
| Solid lines without breaks | The sensor layer in perfect condition | The problem is most likely software or plume |
| Thin intermittent lines | Minor damage ITO-layer | It can manifest as inaccurate touches. Repair is possible, but not always advisable. |
| Large gaps or lack of lines in a particular area | Severe damage to the sensory layer | Replacement of the display module is required |
| Colored spots or distortions | Problems with conductive coating or controller | Diagnosis at the service center is mandatory |
Pay special attention to the corners of the screen and the edges, which are the areas most often damaged by falls, and if the lines break randomly across the screen, this may indicate factory defects or damage during assembly.
Important: sometimes the lines may appear intermittent due to the contamination of the screen. Before the test, wipe the display with a lilac-free napkin dipped in alcohol. If the artifacts remain, this is definitely a hardware problem.
⚠️ Note: Some Xiaomi models (e.g. Mi 11 or Redmi) K40) ITO The test can display false breaks due to firmware features. To rule out an error, compare the results with reference images for your model (you can find them on profile forums such as: 4PDA or XDA Developers).
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If the screen gets even weirder after the test (e.g., new dead zones), don't panic, it's a temporary effect. Reboot your phone and everything will return to normal.
What to do if ITO test
If the test reveals gaps in the sensory layer, you have several options:
Option 1: Software methods (if the damage is uncritical)
- 🔄 Roll back the firmware – sometimes sensor problems appear after the update MIUI. Try to go back to the previous version.
- ⚙️ Reset the settings - go to Settings → Additionally. → Recover and Reset and select Reset.This will help if the problem is in a conflict of programs.
- 📱 Calibrate the sensor – in the engineering menu (#3644633##) find the item TP Calibration.
Option 2: Hardware repair (for serious damage)
If the gaps in ITO-It's a very large layer, and you can't do without physical intervention:
- 🔧 Replacing the display module is the most reliable option, but also the most expensive. The cost depends on the model (for example, for the Redmi Note). 12 Pro+ it ~5-7 thousand rubles).
- 🔩 Repair of the plume – if the problem is not in the screen itself, but in the contacts, the master can solder the plume (price) ~1-3 thousand rubles).
- 🛠️ Local repairs ITO-layers -- some services offer to treat microcracks with a special conductive glue, which is temporary, but cheap (~500-1500 ruble).
Before you carry your phone for repair, check if it is not covered by the warranty.If the smartphone was purchased less than a year ago and the damage is not related to mechanical impact (for example, factory defect), you are entitled to a free screen replacement under the warranty.
Can I repair it myself? ITO-layer?
Frequent errors in the conduct of ITO test
Many users make the same mistakes that distort the test results, and the most common ones are:
- 🧴 Dirty screen - greasy spots or dust can create the illusion of tears.Always clean the display before the test.
- 🔋 Low battery power – if the battery is under 20%, the test may be interrupted or show false errors.
- 👆 Touching during the test -- don't touch the screen while the test is being done. This can knock the scanning algorithm down.
- 📱 Wrong test model – some phones have separate tests for the main and secondary displays (e.g., on Xiaomi Mix Fold).
Another common mistake is ignoring the color legend, and on some devices, the red lines are horizontal, the green lines are vertical, and the blue lines are diagonal, and if you don't know what a color means, the test results are useless, and you usually see the decryption at the top of the screen during the check.
Users are also often confused. ITO Testing with other diagnostic tools, such as:
- LCD Test – checks the screen matrix for broken pixels.
- Vibration Test – Tests the vibration motor.
- Sensor Test – checks sensors (gyroscope, accelerometer, etc.).
If you run the wrong test, the results will be irrelevant. Always make sure that you're the one who's chosen. ITO Test or TP Test.
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ITO The test is a diagnostic of the touch layer alone, it doesn't check the screen matrix, the plumes, or the controller. For a comprehensive analysis of the problem, use all the tests available in the engineering menu.