How to check the touchscreen on a Xiaomi smartphone: from simple tests to professional diagnostics

Touchscreen is one of the most vulnerable elements of Xiaomi’s smartphone, which is subjected to daily mechanical stress, temperature changes and moisture. Even minor damage can lead to improper sensor operation: miss touches, “ghost” presses or complete inoperability of part of the screen, while visually the display can look perfect – cracks and chips are not visible, but the control problems are obvious.

In this article, we will look at 7 proven touchscreen diagnostics on Xiaomi, Redmi and POCO smartphones, from built-in service tests to specialized applications and physical checks. You will learn how to identify hidden multi-touch defects, response delays and dead zones that are not always noticeable during normal use, and when to contact the service center, and when the problem can be solved on your own.

1. Built-in sensor test in diagnostic mode

All Xiaomi MIUI-based smartphones have a hidden diagnostic mode that allows you to test the touchscreen without third-party applications, which works on most models, including the Redmi Note 10/11/12, POCO X3/X4/X5, Xiaomi 11T/12/13 and others.

To run the test:

1. Open the Phone app.
2. Enter the combination: ##6484### (or #4636## on some models).
3. Select Touch Screen Test or Sensor Test.
4. Follow the instructions on the screen – usually swipe your finger across all areas of the display.

In this mode, the system displays a visual touch map: if you leave a gap after you run your finger or the dots don't show up, it's a sign of a malfunction. Pay attention to the corners of the screen and the edges, which are where sensitivity problems are most common.

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If ##6484## doesn’t work, try ##2664##, which is an alternative for some MIUI firmware.

Testing of multi-touch (multipedal touches)

A multitouch is a feature that allows the screen to recognize multiple touches at once, and it malfunctions in games (such as when a character does not respond to clicks), when zooming photos or using gestures, to check the multitouch on Xiaomi:

• 📱 Open any multi-touch app (like Google Maps or a gallery).
• 👆 Try using one hand at a time: Scale the image (with two fingers), scroll up and down (with one finger) and tap on the icons (with the other finger).
• 🔍 Pay attention to delays or “jumping” touches – this is a sign of damage to the sensory layer.

For more accurate diagnosis, use specialized applications:

• Touch Screen Test (from Kyle Cease) - shows the trajectories of touches in real time.
• MultiTouch Tester – Tests up to 10 simultaneous taps.
• Display Tester - checks not only the touchscreen, but also the color reproduction of the display.

Physical check for mechanical damage

Even if the screen is visually whole, micro-cracks or detachment of the touch layer can cause malfunctions.

Check the screen at an angle - sometimes cracks are only visible in oblique light|Swipe your finger on the surface: if you feel irregularities or “steps” – this is a sign of damage.|Note color reproduction: stains or stains may indicate damage to the matrix|Check the reaction to touch in the protective film / glass (if any) – sometimes the problem lies in them.-->

Pay particular attention to:

• 🔺 Screen corners – they are most often affected by falls.
• 🔺 Areas around the front camera – the touch layer is thinner here.
• 🔺 Display edges – if the screen “moves” away from the body, it can disrupt the touchscreen.

⚠️ Attention: If after falling the smartphone stopped responding to touch, but the screen turns on - do not try to disassemble it yourself. 80% In cases, the problem is solved by replacing the touch screen, but with unskilled repairs, you can damage the plume or matrix, which will increase the cost of repair in the future. 2-3 once.

4. Testing with the help of an engineering menu (MTK/Qualcomm)

For advanced users, there's a way to check through the engineering menu, which gives you more detailed information about the state of the sensor, and the instructions vary depending on the processor:

In the engineering menu, you'll see raw sensor data, including touch coordinates, press strength, and delay. If the values are very different from normal (for example, the coordinates "jump" when you press statically), this indicates a hardware malfunction.

5. Check for "ghost touch" (ghost touch)

Ghost touches are when the screen responds to a push that wasn't there, such as spontaneously opening apps, scrolling pages, or entering characters, a problem that often arises from:

• 🔋 Overheating of the processor (especially in games).
• 💧 Moisture under the screen.
• 🔌 Touchscreen plume damage.
• ⚡ Failure of the sensor controller.

To diagnose ghost touch:

1. Place your smartphone on a flat surface and don’t touch the screen for 1-2 minutes.
2. Watch the behavior: if random clicks appear, the problem is confirmed.
3. Start recording the screen (Fast Settings → Screen Recording) and check the touch log.

⚠️ Warning: If the "ghost" touches only appear when charging, the problem may be a faulty cable or power supply.

6.Diagnostics through ADB (for power users)

If standard methods don't work, you can use ADB (Android Debug Bridge) for deep testing, which requires a PC and basic command line knowledge.

Instructions:

1. Enable USB debugging in the developer settings (Settings → About Phone → MIUI version – tap 7 times, then go back to Additional settings → For Developers).
2. Connect your smartphone to your PC and open the command line.
3. Enter the command to get the touch log: adb shell getevent -l
4. Touch the screen – coordinates and event type will appear in the log (for example, BTN_TOUCH, ABS_MT_POSITION_X).

By analyzing the log, you can identify:

• 📊 Missed touches (if there are no records in the log when you actually click).
• ⏱️ Response delays (difference between touch time and registration in the system).
• 🔄 False positives (entries in the log without physical touch).

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ADB-Testing is the most accurate diagnostic method, but it requires technical skills. If you are not sure about your actions, you should contact the service.

7. When to contact the service center?

Not all touchscreen problems can be solved by yourself.

• 🔧 The screen does not respond to touch at all (even after restarting).
• 💥 Physical damage is visible (cracks, chips, glass detachment).
• 🔥 After falling or getting moisture appeared "ghost" touches.
• 🔄 The sensor only works in certain areas (for example, the right half of the screen).
• 📉 Problems get worse over time (response delays increase).

The cost of repairing the touchscreen in Xiaomi depends on the model:

• Redmi Note 10/11: 3 000–5 000 ₽ (glass-change + touchscreen).
• Xiaomi 12/13: 8 000–12 000 ₽ (original).
• POCO F3/F4: 4 000–7 000 ₽.

Before the service visit:

1. Make a backup of the data (Settings → About Phone → Backup).
2. Find out if the service uses original spare parts (clarify the article of the detail).
3. Check the warranty – if the smartphone is warranty, repairs can be free (except for mechanical damage).

FAQ: Frequent questions about checking Xiaomi touchscreen