How to make a touchscreen on Xiaomi: calibration, adjustment and replacement

Display responsiveness issues or “phantom” taps are a common plight faced by Xiaomi smartphone owners. When the screen stops responding to touch or begins to live its own life, the question arises: how to make the touchscreen on Xiaomi work again? Often, users do not mean the physical purchase of a new part, but the software setting of sensitivity or calibration through hidden system tools.

Before you take your device to the service center, you should try to fix it with software. The Android operating system that runs MIUI has powerful diagnostic tools that allow you to check the touch layer, reset driver errors and calibrate the matrix without using third-party software, which is the first thing you need to do when you see dead zones.

But it's important to understand the difference between software failure and physical damage, because if the glass is broken or the plume is gone, no adjustments will help, but if the problem is desynchronization or software glitch, you can bring the device back to life yourself. Let's look at all the methods available, from simple adjustments to complex module replacement.

Checking the sensor through the CIT engineering menu

The most reliable way to diagnose is to use the built-in CIT (Customer Integration Test) menu, which is a tool for factory tests that allows you to check every pixel of the touch layer, and to get there, you need to open the standard Phone application and type in a special code.

Type the combination ##6484##. If the code is correct, the test menu will open. Find Touchpanel or Touch Screen on the list. You will be asked to swipe your finger across all the grid lines. If the line doesn't light up when you touch, there is a physical problem or a major calibration failure in that area.

This method doesn't always cure the touchscreen, but it does diagnose the problem, and if the CIT sensor works perfectly and the system is buggy, it's the app or the firmware, and if the lines don't even come out in the test, there's a hardware malfunction.

Screen calibration via ADB and hidden commands

If the screen is working but not correctly (e.g., the cursor is shifted), calibration is required. In modern versions of MIUI, direct calibration through the menu is often hidden, but you can use a reset command. This will require access to ADB (Android Debug Bridge) or superuser rights, but there is an easier way through the engineering menu.

Some firmware versions have a Calibration or Reset button on the CIT menu, and you force the sensor learning process to restart when you press it, and you can also try typing the command into the input box (if available in your menu version):

adb shell am start -n com.android.engineeringmode/com.android.engineeringmode.EngineeringMode

And it's important to understand that calibration is the process of matching the coordinates of the touch to the coordinates of the image, and if you've changed the glass or the display module, this is a necessary procedure, and without it, the finger can travel an inch away from the touch point.

Using third-party applications to set up

When regular funds are powerless, Google Play apps come to the rescue, and they don't have access to the hardware at the deep level, but they can adjust the touchscreen sensitivity programmatically by creating a buffer zone or changing the trigger threshold.

• 📱 Touchscreen Calibration is a popular application that conducts a series of tests and creates a new calibration profile for the system.
• 🛠️ Touch Screen Repair & Test – a utility for diagnosing and trying to program “reanimate” the response.
• 🎚️ Touchscreen Calibration Pro – allows you to fine-tune the sensitivity and multi-touch.

After installing any of these applications, you need to follow the instructions on the screen. Usually, you need to click several times on the dots that appear. After the procedure, you must reboot the phone so that the system applies the new configuration file.

⚠️ Note: Store apps can't fix the physical wear of the digitizer. If the sensor is worn out physically, the software will only temporarily hide the problem or have no effect at all.

Comparison of Touch Screen Recovery Methods

The choice of method depends on the symptoms. You don't always need to disassemble the phone right away. The table below compares the effectiveness of different approaches to solving the problem of a broken touchscreen on Xiaomi, Redmi and Poco devices.

As you can see from the table, it's always a simple step to start with, so if the CIT menu shows dead zones right after you turn on your phone, software calibration is useless -- you need a replacement, and it saves you time and nerves.

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Before any calibration work begins, be sure to remove the protective glass or film. Thick protective glass can distort sensitivity, creating the illusion of a touchscreen breakdown.

How to make a new touchscreen: a physical replacement

If the software methods did not help, there is an option to “make” a new touchscreen, that is, replace it. In modern Xiaomi smartphones, the touchscreen (digitizer) is most often glued to the matrix and frame, forming a single module. It is difficult to change the glass separately with the sensor and requires special equipment.

The replacement process includes the following steps:

1. Heating the perimeter of the screen with a hair dryer or heating pad to soften the glue.
2. Careful opening of the body with suction cups and mediator.
3. Disabling battery plumes and display.
4. Installation of a new module and check the work before final assembly.

To replace the new module, you will need a special adhesive B-7000 or double-sided tape. It is important not to damage the plumes, as they are very fragile. After replacing the new module, the system may require recalibration, as mentioned above.

⚠️ Warning: When you disassemble yourself, you lose your warranty. If the phone is warranty, take it to an authorized center, even if the problem seems simple.

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Replacing the touchscreen with Xiaomi is a replacement of the entire display module assembled, since it is almost impossible to unstick the sensor from the matrix at home without damage.

Frequent reasons for the failure of the touch screen

Why does it even have to be done again? There may be several reasons, and they may not always be related to the fall of the phone, and understanding the cause will help prevent the situation from happening again in the future.

• 💧 Moisture – getting water under the screen causes chaotic taps (“ghost taps»).
• 🔋 Poor charging – cheap power supplies create interference that makes the capacitive sensor go crazy.
• 📉 Wear of the plume - with frequent falls, the plume connector could move away from the board.

Sometimes the problem is static electricity. Try to completely discharge the phone before it turns off, and then charge it to 100% when it's off, which can "recharge" the power controller and eliminate static interference.

If the screen stopped working after the firmware update, the new version of MIUI may have a driver bug, in which case it is worth checking the forums and possibly rolling back to the previous version of the software through the Mi Flash Tool.

FAQ: Frequently Asked Questions