When Xiaomi’s smartphone stops responding to touch, it can be taken by surprise at any moment.The screen is on, the image is, but the device ignores your actions, turning into a useless piece of plastic and glass. This is a common problem faced by owners of both the budget Redmi models and the flagship Mi series. Most often the reason lies in a software failure or temporary freeze of the system, but physical damage can not be ruled out.
Before you panic and bring your gadget into service, you should try to diagnose the problem yourself. In most cases, recovery is possible at home without special tools. It is important to understand whether the malfunction is hardware or software, because the subsequent algorithm of actions depends on it. Sometimes a simple reboot is enough to bring the touchpad back to life.
In this article, we will take a look at all the possible causes of touchscreen failure and offer step-by-step solutions. We will look at software calibration methods, resetting methods and checking equipment through an engineering menu. Xiaomi provides users with a wide range of self-diagnostic tools that you need to use before contacting the masters.
The main reasons for the failure of touchscreen on Xiaomi smartphones
Understanding the root of the problem is half the success of solving it. Sensor failure on Redmi and Poco devices can be caused by a variety of factors, from banal screen contamination to serious matrix damage. Software failures occur after a failed system update or installation of a conflicting application, in which case the operating system simply stops correctly processing signals from the digitizer.
Physical impacts also play a huge role. Falling a smartphone, even from a low altitude, can lead to a plume detachment or microcracks in the sensor layer. Often the outer glass remains intact, but the inner layer responsible for responding to touch is damaged. Also worth considering the influence of external factors, such as high humidity or extreme temperatures.
- 💧 Infection of moisture inside the housing, causing short circuit of the contacts of the plume.
- 📉 Critical battery discharge resulting in unstable voltage in the screen supply chain.
- 📱 Use of a low-quality charger that creates interference in the operation of the digitizer.
- 🧩 Conflict of a newly installed application with system processes MIUI.
⚠️ Warning: If the phone falls into water, do not attempt to charge or turn it on at any time. moisture inside the device can cause irreversible corrosion of the board when the current is applied.
Separately, the problem of overheating is that when you play a game or the navigator is working, the smartphone body heats up very much, and in such conditions, the capacitive layer can temporarily lose sensitivity, this is a protective reaction of the components, and usually after cooling, the functionality is restored completely without user intervention.
Software recovery methods: reboot and reset
The first thing to do if the sensor stops responding is to perform a forced reboot, which, unlike a conventional shutdown, completely shuts down components and starts the system again, clearing the memory of temporary errors, and most Xiaomi models require you to press the power button and hold it for about 10-15 seconds.
If the screen is partially responsive or you can control the device through external means, try clearing the system cache. Accumulated temporary files can cause conflicts that block the operation of the touchscreen drivers. Go to the settings menu and find the option "Advanced settings", then select "Recover and Reset." Here you can reset all settings, but remember that this will delete your data.
☑️ Actions when the sensor freezes
There's also a cold reset method that helps with static charges, so you need to completely discharge the phone before you turn it off, and then leave it on charge for a few hours, and sometimes it allows you to stabilize the power controller that might have gone into error. After you've fully charged, try turning the device on in the usual way.
💡
If the sensor is unstable, try to turn on the “In gloves” mode in the screen settings – this will increase the sensitivity of the touchscreen.
Diagnostics through CIT Engineering Menu
MIUI firmware has a powerful diagnostic tool called CIT (Customer Integration Test) that allows you to check the health of all hardware components, including the touchpad, without installing third-party software. To enter the menu, you usually use a keyboard combination or a special code in the Phone application.
Type the code ##6484## into the dialer. If the code doesn't work, try pressing the volume buttons (up and down) and power buttons when the phone is off to get to Recovery, and select CIT (if available) or Fastboot, although the sensor is not usually tested in Fastboot. In the CIT menu itself, find "Touchpanel" or "Sensor."
So the test is to draw lines across the screen, and you have to swipe all the lines that you see, so they change color, and if a zone doesn't respond, the system will record that, and that's the most reliable way to tell if the problem is software or hardware repairs are needed.
| Parameter of the test | Normal value. | Sign of malfunction | Action. |
|---|---|---|---|
| Touch response | Instant. | Delay or absence | Calibration or substitution |
| Multitouch | Support for 10 points | Reacts to 1-2 points | Checking the plume |
| coordinate drift | Absent. | Self-pushing | Resetting settings |
| Shutdown zones | No. | There are dead zones. | Replacement of the module |
What if the CIT shows an error?
Calibration of the sensor: when and how to do
Calibration is necessary if the sensor is working, but with distortions: the cursor runs away, the clicks are recorded not where you touched, or the phone prints porridge. On modern versions of Android and MIUI, there may not be a separate calibration application, so system commands or third-party utilities are used.
One way is to use the engineering menu described above, and in some versions of the firmware, there's a separate item called "Touch Calibration." Follow the instructions on the screen: you usually need to click on the dots in the corners of the screen in a certain sequence, and after the procedure is completed, the phone will suggest that you reboot.
If the built-in tools are not available, you can use an application from Google Play, such as Touch Screen Calibration. However, it will require control of the phone. If the sensor does not work at all, connect a USB-OTG adapter and a regular computer mouse, which will allow you to control the interface, download the necessary software and start the alignment process.
It's important to understand that calibration won't work if the physical layer of the sensor is damaged, it only corrects the programmatic coordinates, and if the problem persists after the procedure, it's the hardware. Don't waste time trying again if there's no visible improvement.
Use USB-OTG and external mouse
When the smartphone screen is not fully responsive, but the image is there, USB On-The-Go technology comes to the rescue. Connecting a regular computer mouse through an OTG adapter, you get a full cursor on the screen. It's not a repair, but a great way to save data or perform a setup when the finger is powerless.
To connect, you’ll need a USB-A adapter on Micro-USB or Type-C (depending on your Xiaomi connector). Once connected, a cursor will appear on the screen, you can unlock your phone, back up your contacts and photos to the cloud, and disable your pattern lock or password before you go for repair.
- 🖱️ Allows you to fully control the interface without touchscreen.
- 💾 It allows you to backup important data before resetting.
- 🔓 Helps unlock the device if the password is forgotten and the sensor is not working.
- 📲 It works even when the screen is partially broken if the matrix is intact.
⚠️ Note: Not all Redmi models support the function OTG. Check the specification of your device on the official website or in the instructions before buying an adapter.
It also helps diagnose the problem, so if the mouse is working perfectly and the finger is not feeling, the touchscreen is the problem, and if the mouse is not working, maybe the USB controller or the system itself is hanging, and then only Hard Reset will help through the volume buttons.
Hardware malfunctions and physical repairs
If the software, calibration and reboot didn't help, it's probably hardware-related, and the most common reason is that the touchscreen plume is moving away from the motherboard, and this often happens after falls, even if there's no external damage to the body, and the vibration from the impact could weaken the connector contact.
To fix this problem, you need to disassemble the smartphone. You need to carefully remove the back cover (or display module, if the design is unibody), find the plume running from screen to board, click the locking frame and reconnect it. Often, simple cleaning of contacts and dense re-installation bring the sensor back to life.
In more complex cases, when the touchscreen cracks or the controller fails, a complete replacement of the display module is required. In modern Xiaomi smartphones, the sensor and matrix are often glued together, so they change together. This is an expensive procedure that requires special equipment to heat and separate the layers.
💡
If the reconnection of the plume did not help, and the CIT test shows dead zones, a replacement of the display module is necessary.
It's also worth checking the battery. In some models, the swelling battery starts to push the screen from the inside, creating excessive pressure on the touch layer, which leads to "phantom" presses or complete failure. Visually inspect the phone from the sides: if the body is deformed or the screen is arched, the battery needs to be changed urgently.