Xiaomi reacts to calls, makes notification sounds, or vibrates, but the display remains completely black, a condition that many smartphone owners know is often stuporous, as the device appears to be off visually, when in fact the Android operating system is operating normally, and the problem can be either a software failure or a physical malfunction of the matrix or plume.
Before you bring the gadget to the service center, it is worth trying a number of actions that often help to return the image without financial costs. AMOLED-screens the probability of failure of the matrix is higher than on the old IPS-But software conflicts are ubiquitous. In this article, we'll look at all the possible causes and methods of solving the problem.
Diagnosis of the state of the smartphone
The first step is to determine exactly what the fault is, and if the screen is black, but you hear the sound of an incoming call, that's half the success of the diagnostics, so the motherboard is alive. Try unlocking the device in the usual way: by fingerprinting or touching the password. If you enter the code, you hear a characteristic unlock or vibrational sound, the problem is localized to the display module.
Carefully inspect the case for traces of falling or moisture. Even a microscopic amount of water entering the charging connector can cause the contacts of the display plume to oxidize. Liquid is one of the most insidious enemies of electronics, and its effects may not occur immediately, but after an incident.
It's also worth checking if your smartphone has overheated, and if it's been in the sun for a long time or under high load, the protection system could have turned off the backlight to prevent damage to the components, let it cool in the shade, and try turning it on again.
⚠️ Warning: If you smell a burn or see a bloated body, immediately stop trying to turn on and disconnect the charger.
☑️ Primary diagnosis
Forced resetting of the device
The easiest and often effective way to eliminate the software glitch that caused the black screen is Hard Reset, which, unlike a conventional shutdown, disrupts all current processes and forcibly restarts the operating system, bypassing the standard menu. On Redmi and POCO smartphones, this action is safe for user data, unless you confuse it with a full reset.
To perform the procedure, press both the power button and the volume button. Hold them for 10-15 seconds. If the device reacts with a vibration or the logo of the brand appears on the screen, then the system has gone into reboot. In some cases, the screen may remain black until the system is fully loaded, so be patient.
If the standard combination didn't work, try holding the power button for more than 20 seconds. Sometimes the power controller sticks in a certain state, and a long pulse helps to reset it to its original position, which is especially true for models with non-removable batteries.
What to do if the buttons don’t work?
Checking in Recovery and Fastboot mode
To make sure that the display itself is working or the problem lies in the bootloader, you need to try to get into service modes. Recovery mode and Fastboot mode are loaded before the main shell of MIUI or HyperOS starts. If in these modes the image appears, then the matrix and the plume are intact, and the problem is software.
To enter Recovery mode, turn off your phone (if possible through prolonged button retention) and press the power button along with the volume button. Enter Fastboot uses a combination of power and volume reduction. Hold the buttons until the logo or image of a hare repairing a robot appears.
If the screen is black in these modes, but the phone vibrates or warms up in the area of the processor, the probability of hardware failure of the display module is up to 90%, in which case software treatments will be useless.
Table: Comparison of symptoms and probable causes
For easy diagnosis, we've put the main symptoms into a table, which will help you navigate the nature of the malfunction more quickly and choose the right vector of action.
| Symptoms. | Probable cause | Method of decision | Difficulty |
|---|---|---|---|
| There's sound, vibration, black screen. | Software failure or plume failure | Reset, check the plume | Low/Mediocre |
| Black screen, no reaction. | Battery discharge or death of pay | Long-term charging, replacement of battery | Medium |
| Image is there, but no lighting. | Failure of the illumination circuit | Lantern on the screen (check), repair | Tall. |
| Twinkle before switching off | The driver or plume problem | Firmware, module replacement | Tall. |
The Light Test Method and Connecting External Displays
There's an effective way to check if the matrix is working, but if only the backlight is working, turn on the flashlight of another phone and press it tightly against the screen of the problem device from different angles. If you see a dim image of a logo, watch or menu, then the LCD/OLED matrix is functioning, but the backlight circuit or the screen power controller is burned.
For modern smartphones with support for video output via USB-C (for example, the flagship Xiaomi series), you can try to connect the device to the TV or monitor through an HDMI adapter. If the external display appears picture, it confirms that the “brains” of the phone are fine.
You should also try to connect the mouse or keyboard through OTG-Adapter: If the mouse cursor appears on a black screen (you can find it by swiping your finger across the display in the dark, sometimes the cursor is faint), you can blindly try backing up data or resetting settings.
💡
Use TalkBack or voice assistant if your phone is responding to a voice. Take a screenshot or turn on a bright light can help diagnose.
Hardware problems: plume and display
If the software didn't work, it's probably hardware, and the most common reason is that the display plume is moving away from the connector on the motherboard, which often happens after a fall, even if there's no external damage to the body, and the shock wave is transmitted inwards and disrupts the contact.
The second option is to fail the display module itself, and on AMOLED screens, which are used in most modern Xiaomi, organic diodes can burn out locally or completely, and unlike IPS, where the backlight burns, here the pixels themselves are damaged and you can't restore them.
⚠️ Attention: Self-disassembly of the Xiaomi smartphone requires special tools (suction cups, mediators, hair dryers) and skills. Inept autopsy can lead to damage to the battery and its ignition.
The third option is a malfunction of the power controller or video chip on the motherboard, which is the most difficult case, requiring professional soldering and diagnostics in the service center, and you can only make things worse on your own.
💡
If you have Recovery, the screen lights up and you go out, it's a problem with the software or the drivers, and if the screen is black everywhere, it's a hardware breakdown.
Prevention and preservation of data
When the screen is unstable or goes out periodically, it is critical to save important information. Use the cloud services of Google Photos and Google Drive, setting up automatic synchronization.
To protect against mechanical damage, use high-quality protective glass and high-sided covers, which take the brunt of a flat drop, protecting the edges of the display, where the plumes most often depart.
Avoid extreme temperatures. The sharp change from frost to heat causes condensation inside the case, which is a common cause of short circuits and failure of the display. Let the phone warm up in a switched-off state before turning on.