Buying a new smartphone is always an exciting moment, especially when you get a fresh Xiaomi Redmi 12. However, sometimes the joy is overshadowed by the misunderstanding of how to activate a device that at first glance seems completely unworkable. Many users are faced with a situation when the screen remains black after unpacking, and the device does not show signs of life, which causes panic and a false sense of marriage.
In fact, modern Xiaomi smartphones often come with a dead battery or are in deep sleep mode to keep the battery safe while stored in storage for long periods. Understanding the physics of lithium-polymer power supplies helps to realize that not responding to the power button in the first seconds is a normal phenomenon that requires a certain algorithm of actions.
In this article, we will take a look at all possible scenarios for your gadget to launch, from standard procedure to resuscitation methods for software failures, how to distinguish a discharged state from a malfunction, and what combinations of buttons will help to revive the system power controller.
Primary activation and charging of the device
The very first step to take immediately after removing the Xiaomi Redmi 12 from the box is to connect to the power source. Even if the charging indicator is on fire, don't rush to start the operating system right away. Modern power controllers require time to accumulate minimum voltage to safely start the processor.
Use the original cable and adapter included in the package, or certified charging with support for fast charging Power Delivery. Connect the device to the network and leave it alone for at least 15-20 minutes, during which time a large battery icon may be displayed on the screen, signaling the process of energy storage.
If the screen is still black, but the notification indicator (if it is in this modification) or vibration when connecting the charging is present, then the device is alive. In case of complete silence, try to replace the cable or socket, as the problem can be hidden in the banal lack of current.
💡
Use only the original USB-C cable from the kit, as cheap counterparts may not pass enough current to wake up the deeply drained Redmi 12 battery.
Once you've verified the charge, find the physical power button. In the Redmi 12, it's usually on the right side of the body. Press and hold it for 3-5 seconds. The screen should catch fire, and the MIUI or HyperOS logo will appear.
Location of buttons and start combinations
The ergonomics of the Xiaomi Redmi 12 assumes a classic arrangement of controls, but in a hurry or with a protective case, it is easy to make mistakes. The switch has a characteristic texture and is often painted in a contrasting color or has a red mark in the factory so that the user does not confuse it with a swing volume.
In some rare cases, especially when touchscreen or system crashes, a forced reboot may be required, using a keyboard combination that hardware interrupts the power supply to the logic nodes, forcing a restart.
- 🔘 Standard Start: Hold the Power button (Power) 3-5 seconds before the logo appears.
- 🔄 Forced reboot: Press the on button and Volume Up button at the same time 10-15 seconds.
- 📉 Alternative reset: In some versions of the firmware helps to clamping the button on and reduce volume (Volume Down).
It's important not to let go of the buttons too early. The processor can react with a delay, especially if the battery was at the discharge limit. If you feel a slight vibration or heat in the area of the camera, then the process has gone.
☑️ Pre-insertion check
What to do if Redmi 12 is not included
The situation when the smartphone refuses to respond to any manipulations can be caused not only by a discharge, but also by a software conflict or “hang” in cyclic mode. If the screen is black, but the device is warming or vibrating without booting, most likely, there was a malfunction in the operating system.
The first thing to try is the cold reboot method. Leave the phone disconnected from charging for 10-15 minutes to discharge the residual current in the capacitors. Then plug the charger in and immediately try to pinch the button combination to force start.
⚠️ Warning: If the device gets too hot in your pocket or in the sun, let it cool completely to room temperature before trying to turn on to avoid battery damage.
A common cause of failure is a faulty cable or power supply. Try connecting your smartphone to your computer via a computer. USB-If an unknown device or connection sound appears in Windows Device Manager, then the power controller is working and the problem may be in the display or plume.
Deep Battery Sleep Mode
It is also worth checking the charging connector for dust or pile that may have gotten there during transportation. Carefully, without using metal objects, clean the USB Type-C port with a soft dry brush.
Diagnostics via Recovery Mode and Fastboot
If standard methods don't work, you need to go to diagnostic modes. Xiaomi smartphones have two main engineering modes: Recovery and Fastboot, which confirm that the hardware of the device is good, and the problem lies in the software part.
To enter Recovery mode, disconnect your phone completely. Then press the volume button and, without letting it go, plug in the charging cable. If done correctly, you'll see a menu with a few points on a black or white background.
| Regime. | Button combination | Screen indication | Appointment |
|---|---|---|---|
| Recovery | Volume + and Charging | Main Menu menu | Resetting settings, cleaning the cache |
| Fastboot | Loudness - and Charging. | The Hare in the Uschank (Android) | Flip-through, deep diagnostics. |
| Safe Mode | After the logo (rarely) | Inscription Safe Mode | Launching without third-party applications |
Getting into Fastboot mode is often scary for beginners. Don't panic. To get out of it, just press the power button for 10 to 15 seconds until the device vibrates and reboots.
If the phone is entering these modes but not loading normally, try resetting to factory settings via the Recovery menu. Select Wipe Data, confirm the action and wait until the process is over. Remember, this will delete all your data.
Problems with display and indicators
Sometimes the phone turns on, works (the sound of the system, the vibration of the buttons), but the screen remains black, this may indicate a malfunction of the OLED or IPS matrix, or a problem with the plume connecting the display to the motherboard.
Try to gently, without strong pressure, press the top of the screen or slightly bend the body in the camera area. If the screen blinks or artifacts appear, then the contact of the plume is broken. In this case, self-repair is not recommended, you should contact the service.
It's also worth checking the proximity sensor. In some cases, a software failure may block the screen from turning on, "thinking" the phone is in your pocket. Wipe the top of the screen and make sure the protective film doesn't override the sensors.
⚠️ Warning: Don't try to disassemble the Redmi 12 body yourself unless you have experience.The back cover is glued and a careless opening could damage the print scanner plume or the screen itself.
If you see a logo when you turn on, then a black screen with a flashing cursor or just a black background, the bootloader files may be damaged, in which case only flashing through the computer using the Mi Flash Tool utility will help.
Configure after first activation
When the screen finally lights up and you see the welcome window, the initial setup phase begins, and the system will ask you to select a language, connect to Wi-Fi, and log into your Mi Account, which is necessary for cloud services to run and find the device in case of loss.
Do not miss the upgrade step if offered immediately after you turn on. New firmware versions often contain bug fixes that may have caused problems with the inclusion of previous users.
After loading the desktop, it is recommended to check the screen settings immediately. Go to Settings → Screen and make sure that the brightness and refresh rate are set correctly.
💡
Successful activation is only the first step: be sure to update the system and back up your data before active operation to protect yourself from future failures.
Now your Xiaomi Redmi 12 is ready to go, and if you notice that the phone is turning off on its own when it’s above 20%, you should check the battery status in the engineering menu or contact the warranty center.