When a Xiaomi smartphone stops responding to attempts to unlock the screen, it can be taken by surprise at the most inopportune moment: you click on the display, swipe your finger, but the lock button or unlock zone simply ignores your actions.
The reasons for this behavior can range from a simple software failure in the shell of MIUI or HyperOS to physical damage to the matrix. Often users confuse the software freeze interface with a touchscreen breakdown, which leads to unnecessary repair costs. Before carrying the device into the service, you need to conduct a thorough diagnosis to understand what exactly went down: the touch layer or the software.
In this guide, we will look at all possible methods for restoring the input system, and we will look at how to programmatically reboot, calibrate the screen, and configure alternative access methods that will allow you to use the device even if the sensor is partially inoperable.
Primary diagnostics and system restart
The first step in eliminating any anomalies of the Xiaomi smartphone is a complete reboot. If the screen responds to touch, but the lock system does not start, there may have been a failure in the system process SystemUI. In this case, it is enough to perform a standard reboot through the power menu or the button in the notification curtain.
However, if the touchscreen completely ignores touch and you can't even turn off the phone in the standard way, you'll need a forced reboot, which is safe for your data and often solves problems with the hanging sensor drivers, and you need to press the on button and hold it for 10-15 seconds until the device vibrates and the brand logo appears.
⚠️ Warning: If the screen lights up after a forced reboot but still doesn’t respond to touch, the problem may be physical damage to the plume or touchscreen itself, especially if the phone has recently fallen.
After a successful reboot, check the sensor at different corners of the screen. Sometimes the problem is localized to a specific area, such as where the unlock button is usually located, in which case a temporary change in the orientation of the screen or the launch of a heavy application that will redraw the interface helps.
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Use the One-Hand Control feature in the settings to move the interface down and check if the top of the screen responds to touches in other areas.
Checking the physical condition of touchscreen and protective films
Often the reason the unlock button or the entire screen doesn't work is because of external factors: poor quality protective glass, thick films or covers covering the edges of the display can block the sensor signal, especially for models with curved edges of the screen, where the capacitive layer is most sensitive to external pressure.
Carefully examine the surface of the display for cracks, chips or severe scuffs. Even a microscopic crack in the area of the lock button can disrupt the electrical circuit of the sensor, making this area “dead.” It is also worth checking whether the device overheated: at high temperatures, touchscreens can temporarily lose sensitivity.
- 🧼 Clean the screen with a soft microfiber, removing fat and dirt that can distort the signal.
- 📱 Remove the protective glass or film to see if the problem will persist without them.
- 🌡️ Let your smartphone cool down if it was in the sun or under load, and check the sensor.
If you use magnetic cases or holders in a car, they can also affect the digital layer. Remove any foreign objects from the back cover and edges of the device. Sometimes static electricity accumulated on the surface of the glass blocks the input; you can remove it by rubbing the screen with an antistatic wipe.
☑️ Diagnosis of physical factors
Screen calibration and engineering menu
The Android operating system that Xiaomi and Redmi are running on has a built-in tool to diagnose and calibrate the touch screen, and if the lock button is not working properly or is reacting with a delay, the sensor may have been calibrated, and this menu is accessed through a special code in the Phone app.
Dial ##6484## to enter the CIT engineering menu. In the test list, find Touchpanel or Touchscreen Test. Here you will be asked to draw lines along the circuit of the screen. If the line is interrupted in the lock button area or not drawn at all, this confirms the sensor problem at the hardware level.
Code for logging into the engineering menu: ##6484##
The Way: CIT -> Touchpanel -> StartSome firmware versions have automatic calibration, so if you've passed the test but you've got glitches, try resetting the sensor through the same menu if you have that option for your model, and this action resets the sensitivity of the matrix.
What if the code doesn't work?
Configuring alternative unlocking methods
If the lock button area is damaged or unstable, switching to other authentication methods is a smart solution. Xiaomi smartphones offer many options that can completely replace the pattern lock or pin code entered by a finger in the problem area.
The most convenient option is face unlock, which scans your face through the front camera and unlocks the device in a split second, which does not require touching the screen, which is ideal for a touchscreen failure at the bottom, and it is also worth considering using a fingerprint scanner if it is located on the side face or back of the case.
| Unlocking method | Location. | Screen dependency | Reliability |
|---|---|---|---|
| Face ID (Face Recognition) | Front camera. | It doesn't matter. | High (day) |
| Imprint scanner (Sideways) | Activation button | It doesn't matter. | Very high. |
| Fingerprint scanner (In screen) | Down the screen | Depends on the zone. | Medium |
| Pattern / PIN-code | All screens. | Tall. | Tall. |
To set up, go to Settings → Passwords and Security, and you can add multiple faces or fingerprints to increase the likelihood of successful unlocking. If your model has a fingerprint scanner built into the screen and the area underneath doesn't work, side unlocking is a lifesaver.
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Using biometrics (face or finger) allows you to completely bypass the idle area of the screen when unlocking the device.
Use of Assistive Touch (Assistive Touch)
If the physical power button also fails or you can't reach the lock zone, Assistive Touch is a virtual button that hovers over all windows and allows you to emulate taps, lock the screen and call the power menu without using physical elements.
You can activate this function through the settings menu if the screen is partially responsive, or with the voice assistant. Path to setup: Settings → Advanced settings → Auxiliary functions. Turn on the switch and adjust the location of the floating button so that it does not overlap important elements, but is available for pressing.
You can take a "Block Screen" or "Switch Off Menu" action from the virtual button menu, which allows you to control the state of the device even when the touchscreen at the bottom is completely broken, where navigation elements are usually located, and you can also take screenshots and switch apps through this button.
- 🖱️ Set up a double-touch button to quickly lock the screen.
- 📍 Move the floating button to any free area of the screen for convenience.
- ⚙️ Add to the Quick Actions menu the launch of the camera or flashlight.
⚠️ Attention: Assistive touch may interfere with games or video. Use the Hide Full Screen feature in Assistive Touch settings.
Radical measures: dumping and contacting the service
When software, calibration, and alternative input methods fail, extreme measures are needed: If the screen reacts chaoticly (phantom presses), this can be a sign of a deep driver conflict, in which case a full reset to the factory settings (Hard Reset) can help.
To reset without access to the screen, you can use a combination of buttons to enter Recovery mode. Usually, this is pressing the Volume Up button and Power on the device off. In the Recovery menu, you control the volume buttons and select the power button. Select Wipe Data to clear the device.
However, if the problem persists after the reset, it may be a hardware malfunction, such as a retiring touchscreen plume, oxidation of contacts after moisture is injected, or failure of the power controller, in which case the device must be disassembled and parts replaced at an authorized service center.