How to Check the Touch Screen on Xiaomi Phone: A Complete Guide with Tests and Tips

Touchscreen is one of the most vulnerable parts of Xiaomi’s smartphone, especially if you’re actively using a device or have been mechanically impacted. Touchscreen issues range from random “ghost” touches to completely ignoring touches in certain areas. But how do you tell a software glitch from a physical breakdown? This article will help you diagnose the sensor on Xiaomi phones (including Redmi, Poco and Mi models) without going to the service center.

We'll look at both built-in diagnostic tools and third-party applications, as well as physical verification methods. It's important to understand that some malfunctions (such as uneven sensitivity after a fall) may indicate damage to the plume or matrix - in such cases, self-repair is not recommended, but in 60% of cases, the problem is solved by software: resetting, updating the firmware or calibrating.

Before you start the tests, make sure that the screen is clean (dust and greasy traces can distort the results), and there is no moisture on your hands. If you use a protective glass or film, temporarily remove it - sometimes defects in the adhesive layer mimic a sensor malfunction.

1. Built-in sensor test via engineering menu

All Xiaomi smartphones have a hidden engineering menu (CIT) where you can test hardware, including touchscreen.This method does not require the installation of additional programs and works even on locked devices.

To run the test:

1. Open the phone app and enter the combination: ##6484###
2. The Manual Test menu will appear on the screen – select Touch Screen (or TP Test on some models).
3. Follow the instructions on the screen: You usually need to swipe your finger over all areas of the display so that the system registers touches.

The results will be displayed in the form of a color map:

• 🟢 Green color – the sensor works correctly.
• 🟡 Yellow/orange: weak reaction (possible calibration problems).
• 🔴 Red – lack of response (physical damage or plume break).

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If the engineering menu doesn't open, try the alternative code ##4636## → "Equipment Testing" → "Touch screen." On some MIUI firmware, this path works more stable.

⚠️ Note: On Xiaomi models with MediaTek processors (e.g. Redmi Note 11 or Poco) M4 Pro) the engineering menu may be blocked, in which case use the methods in the following sections.

2. Verification of the sensor through applications

If built-in tests are unavailable or have mixed results, use third-party utilities that offer advanced diagnostics, including multi-touch and response time.

Top.-3 Applications for testing the sensor on Xiaomi:

• 📱 Touch Screen Test (from KVADGroup) – shows touch coordinates, tests gestures and supports modes for checking the stylus.
• 🎯 MultiTouch Tester – Visualizes all touch points (useful for diagnosing dead zones").
• 🔍 Phone Doctor Plus is a comprehensive utility that checks not only the sensor, but also other components (accelerometer, gyroscope).

How to use MultiTouch Tester:

1. Install the app from Google Play.
2. Run the test and touch the screen with a few fingers.
3. And you'll see colored circles with numbers on the screen, each corresponding to the touch point, and if a finger doesn't show up, it indicates a multi-touch problem.

Remove the cover and protective glass

Charge your phone at least 50%

Reset the device

Check the screen cleanliness-->

Apps also help detect "ghost" touches -- when the screen reacts without physical contact. If you see random taps in the same place, it could indicate damage to the touch layer or moisture entering the screen.

Physical Testing: What Can Be Done Without Tools

Not all sensor malfunctions are electronically related, sometimes mechanical damage or contamination, and do a visual inspection and simple tests.

• 🔦 Screenlight: Turn on the flashlight and illuminate at an angle on the display. Visible cracks or stratifications of the matrix (even without external damage) can cause sensor malfunctions.
• 🤏 Pressure test: Carefully press different parts of the screen (for example, in the corners). If artifacts appear when pressed or the sensor stops responding, this is a sign of detachment of the plume.
• 💧 Humidity: If your phone has recently come into contact with water, place it in a silica gel bag for 12 to 24 hours.

Pay special attention to the screen frame: if it is deformed (for example, after a fall), this can press on the touch layer, causing unstable work. On Xiaomi models with curved screens (for example, Mi 11 Ultra or Redmi K50 Pro), such defects are more common.

⚠️ Warning: If after a physical examination you find screen bloating or matrix stratification (visible as iridescent spots), do not try to disassemble the phone yourself - this can lead to a complete failure of the display.

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Sensor calibration: when it helps and when it doesn't

If the sensor is not responding accurately (for example, touches are recorded with bias or require strong pressing), the problem may be in calibration. This often occurs after updating the firmware or resetting settings.

How to Calibrate the Sensor on Xiaomi:

1. Go to Settings → System → Additional → Screen calibration (on some models, the path may differ).
2. Follow the instructions on the screen: you usually need to touch the target several times in different parts of the display.
3. Once completed, restart the phone.

If the calibration item is not on the menu, use the Touchscreen Calibration app.

• ✅ Calibration helps with software failures (for example, after updating).
• ❌ It is useless for physical damage (cracks, detachment of the plume).

5.Diagnostics via ADB: for advanced users

If standard methods fail, you can use Android Debug Bridge (ADB) to test the sensor in depth, which requires connecting the phone to a computer and basic command line knowledge.

Instructions:

1. Enable USB Debugging in the Developer Settings (Settings → About Phone → MIUI Version – Press 7 times, then return to Additional → For Developers).
2. Connect your phone to your PC and open the terminal (or cmd in Windows).
3. Enter the command to check sensor events: adb shell getevent -l When touching the screen, the terminal will display coordinates and event type (e.g, BTN_TOUCH or ABS_MT_POSITION_X).

What to look for in conclusion:

• 📍 Coordinates outside the range (e.g., X)=1500 at screen resolution 1080px) — sign.
• ❌ No Events When Touched – Damage to the Sensor or Trail.
• ⚡ Repeated events – the touchscreen controller may fail.

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ADB-The test is most accurate for diagnosing "ghost" touches, as it shows raw data from the sensor controller rather than processed by the system.

6.When to contact the service: signs of serious breakdowns

Not all sensor problems can be solved by yourself, but here are 5 signs that your phone needs professional repair.

• 🔧 The screen responds only to a strong press - wear of the touch layer or damage to the digitizer is possible.
• 🌡️ Local overheating in the area of the screen - may indicate a short circuit in the plume.
• 🔄 Spontaneous reboots when touching – often associated with damage to the touchscreen controller.
• 📉 Gradual deterioration of sensitivity - a sign of detachment of the sensory film.
• 💥 Visible physical defects (cracks, bloating, stratification) – require replacement of the display module.

The cost of sensor repair on Xiaomi varies depending on the model:

• Redmi Note 10/11: 3 000–5 000 ₽ (touchscreen + glue).
• Poco F3/F4: 5 000–7 000 ₽ (because AMOLED-matrix).
• Xiaomi 12/13 series: 8 000–12 000 ₽ (display-module).

If the phone is warranty-free, don’t disassemble it yourself – this will void warranty obligations. In Xiaomi service centers, diagnostics of the sensor is usually free, and repair takes 1-3 days.

7.Prevention: How to prolong the life of the sensor

To avoid problems with the touch screen, follow simple rules:

• 🛡️ Use high-quality protective glass (at least 0.3 mm thick) – it reduces the risk of damage from falls.
• 🧴 Regularly clean the screen with alcohol-free wipes (alcohol destroys the oleophobic coating).
• 🔋 Avoid overheating – do not leave your phone in direct sunlight or on charging near heat sources.
• 💧 Do not use your phone with wet hands or in high humidity conditions (such as in the bathroom).
• 📦 When transporting, put the smartphone in a hard case with a screen to yourself (this will reduce the risk of scratches).

In the models with AMOLED-screens (e.g. Xiaomi) 12T or Redmi K60) The sensor is more sensitive to pressure, so avoid wearing the phone in the back pocket of jeans – prolonged squeezing can cause damage to the matrix.

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If you drop your phone frequently, consider Corning Gorilla Glass Victus models (such as the Xiaomi 13 Pro or Poco F5 Pro) that can withstand falls from up to 2 meters on a hard surface.

FAQ: Frequent questions about the Xiaomi sensor