When a beloved Redmi or Poco suddenly stops responding to touch, it can be taken by surprise at the most inopportune moment: the screen is on, the picture is frozen, but neither the buttons nor the swipes are working. This is a classic touch layer failure or a software "hang" of the MIUI operating system. In most cases, panic early, because the problem is solved by software methods without visiting the service center.
The first thing to do is to understand the scale of the disaster, and if the device simply doesn't respond to the user's actions, but it continues to consume energy and warm up, then the processing of the commands has stopped, often the culprit is overheating of the processor or overflow of RAM, which is typical for heavy applications or games, in which case the system blocks data input to preserve the integrity of the files.
It is important not to try to disassemble the case immediately. Modern Xiaomi smartphones have a complex build structure, and inept interference can break the tightness or damage the plumes. First, you should try all available methods of soft reset, which are safe for data and hardware. Below we will discuss the algorithm of actions from simple steps to more complex ones.
Forced reset as the main method
The most efficient and safest way to resuscitate a device is by forceful reboot. Unlike conventional shutdowns, this method breaks the motherboard's power at the software level, forcing controllers to restart all processes from scratch. For Xiaomi smartphones, this is often the only salvation when the SystemUI interface freezes.
To do this, you'll need to press the power button. However, depending on the model and the firmware version, the combinations may differ. Some users confuse this mode with logging into a Fastboot, so it's important to keep timing. If the phone vibrates and the "Mi" or "Redmi" logo appears, then the procedure was successful.
☑️ Hard reset algorithm
In the rare cases where standard retention doesn't work, you can try a button combination. This is true for models with physical volume buttons. Prolonged pressing, sometimes up to 20-30 seconds, can break through the "deaf" lock system. The main thing here is patience, because the system can not respond to the first pulse for a long time.
⚠️ Warning: If the phone freezes again after a forced reboot after a few minutes, the problem may be a battery malfunction or critical overheating.
Diagnostics through the Engineering Menu and Recovery
If the screen is partially responsive, or you can distinguish between the image and the sensor is not working properly, it is worth checking the system status through hidden menus. There is a powerful tool in the MIUI shell for testing hardware, and you can get there by typing a special code in the "ringer", if it is available, or through settings.
Type ##6484## into your phone app, and this will open the CIT (Customer Information Test) menu, and you can run a Touch test to see which areas of the display are not responding, and if you see dead zones in the test that don't disappear after you reboot, that's a sign of physical breakdown.
You can use Recovery mode to get a deeper diagnosis, and when the phone is off, you can enter it by pressing the power and volume buttons plus, and in this mode, the sensor often runs at the basic driver level, and if the buttons are working in Recovery, the touchscreen is physically healthy and the problem is in the operating system.
⚠️ Warning: Be extremely careful when you are in the Recovery menu.Selecting Wipe Data will result in the complete removal of all photos, contacts and applications without the possibility of recovery.
Sensor problems: calibration and settings
Sometimes the screen freezes in software and involves the desynchronization of the grid, and in such cases, sensor calibration helps, a procedure that is especially relevant after a poor repair or fall, where the glass may have shifted to microns, but the system continues to "think" that it is in place.
You can use third-party apps from the Google Play store to calibrate if you can control the phone somehow, or built-in tools. It's also worth checking the sensitivity settings. Some Xiaomi models have a "Gloves Mode" option that changes the capacitive layer's algorithm, which can temporarily solve the problem.
If you've recently installed a low-quality safety glass, it could cause interference. Thick or poor-quality glass changes the electrostatic field, causing the touchscreen controller to get wrong. Removing the protective coating is a quick way to test this hypothesis.
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Use the One-Hand Control feature in the settings to resize your workspace, which will help you know if the entire screen is hanging or just a part of it.
What to do if the screen is completely black
When the screen is black, but the phone is responding to calls or vibrations, it's called "Black Screen of Death," and in this case, the backlight may be good, but the sensor doesn't receive the signal, or the plume has burned, and you can check the status by calling the device from another number.
If the call passes but the screen doesn't light up, try connecting the phone to your computer via USB. If the PC makes the device's connection sound, the motherboard is alive, and then you can try the blind action of unlocking the phone (swipe your finger) and tapping the screen in the "take call" area.
For USB OTG-enabled models, there's a great life hack. Connect a normal computer mouse through an adapter. If the system doesn't die, a cursor will appear on the screen (if it's a little light), which will allow you to save important data or back up before resetting.
Secret method of turning on the lights
Resetting settings and flashing the device
When software failures become critical, a complete data reset helps, a radical method that deletes all user data, returning the phone to factory status, before you do that, you need to make sure you have a backup in the Mi Cloud or on your computer.
You can reset via the Recovery menu. Select a language (usually English or Chinese), then go to Wipe Data -> Wipe All Data. Confirm the action. The process will take a few minutes. After that, the phone will reboot as new.
Even if the reset doesn't work, you'll need to flash it back, you'll need a computer, you'll need a Mi Flash Tool, you'll need a firmware file, and you'll need to choose the right version: Global or China, and a mistake in choosing a region can make the phone turn into a brick.
| Type of discharge | Data retention | Difficulty | Efficiency |
|---|---|---|---|
| Soft discharge (Reset) | Complete. | Low. | Medium |
| Reset via settings | No (deletion) | Low. | Tall. |
| Recovery Mode | No (deletion) | Medium | Tall. |
| Flashing (Fastboot) | No (deletion) | Tall. | Maximum |
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Before you run Wipe Data, you must extract it. SIM-card and memory card to avoid accidentally formatting or blocking your Mi Account.
Hardware malfunctions and repairs
If the software methods are powerless, you can suspect hardware. A common cause of freezes is battery bloating. The battery can push the display from the inside, creating a voltage on the matrix. Visually, this may not be noticeable, but the phone may lie on the table and wobble slightly when pressed.
There are also possible problems with the display plume, which can be oxidized or moved by constant temperature changes or shocks, and at home you can gently press the top of the screen (where the plume is usually located), but you need to do this without fanaticism, so as not to crush the matrix.
Moisture is another enemy, and even if the phone didn't fall into the water, the high humidity could have caused the circuit board to short, so only professional cleaning in an ultrasound bath and multimeter diagnostics would help, and turning on a wet phone yourself is strictly forbidden.
⚠️ Warning: Don't try to dry your phone with a hair dryer or on a battery! high temperature will melt the sealant's adhesive layer and can damage OLED-A matrice that is afraid of overheating.
Replacing the display module is the most common solution for physical damage. In modern Xiaomi smartphones, the glass and matrix are often glued together. It is economically feasible to change only the glass only in specialized workshops with a separator. At home, it is easier to replace the module assembled.
Prevention of hangings in the future
To avoid a repeat of this, you need to follow simple rules of operation: Do not overflow memory: keep at least 10-15% of the total free, this is necessary for the system to create temporary files and cache.
Regularly update applications and the operating system itself. MIUI developers are constantly releasing patches that fix driver and sensor errors. Ignoring updates can lead to a build-up of bugs.
Use only original or certified chargers. Cheap power supplies give power surges that can destabilize the operation of the power controller, which indirectly affects the stability of the screen.