When your Xiaomi Redmi 4 Pro suddenly stops responding to taps, it can take you by surprise: The screen stays black, the indicators don't burn and charging attempts fail to produce visible results.This is a common problem faced by owners of devices released several years ago, and it doesn't always mean a fatal breakdown.
Often the cause is a software failure or a deep battery discharge that requires specific actions to activate. Before you carry the gadget to the service center, you should try to conduct a number of diagnostic procedures yourself. In this article, we will discuss in detail the algorithms of actions that will help revive the smartphone at home.
Don’t panic if the device doesn’t show signs of life immediately after being connected to the grid. Lithium polymer batteries, especially in the Prima or Pro series, can go into deep sleep if the voltage drops below a critical threshold.
Primary diagnostics and visual examination
First, you need to avoid mechanical damage and problems with external components. Carefully inspect the body for chips, especially in the area of charging connectors and buttons. Sometimes physical exposure leads to detachment of the plumes inside the housing, which interrupts the power chain.
Check the integrity of the charging cable and adapter. Try using another power supply, preferably with characteristics close to the original (5V/2A). Poor-quality cables may pass current, but its strength will not be enough to start the system or even display the charge indicator.
⚠️ Warning: If after falling or getting moisture, the device makes strange sounds or smells of burning, immediately stop trying to turn it on and disconnect it from the network.
Pay special attention to the Micro-USB port. It often gets dust and pile from your pockets, which prevents close contact. Carefully, using a non-metallic toothpick, try to clean the connector. Be extremely careful not to damage the central tongue inside the port.
☑️ Initial inspection of the device
Forced reset and static voltage reset
One of the most effective methods if the Xiaomi Redmi 4 Pro does not turn on but responds to charging is to reset static voltage.The smartphone's electronics could freeze in a state where the standard lock button press is not handled by the power controller.
To perform this procedure, press the on button and hold it for 15-20 seconds. In some cases, you need to simultaneously press the volume key (slow down or zoom in). Hold the buttons until you feel a short vibration or see the Mi logo.
If the first time it didn't work, don't despair. Try connecting the device to your computer through a computer. USB-And then you do a button combination, sometimes you connect to the keys. USB-PC port gives the necessary impetus to exit deep sleep.
Why does prolonged clamping help?
It's important to do these things even if the screen is black. Vibration response or PC connection sound may come later than visual image. Continue to hold the buttons in cycles of 20 seconds with little interruption.
Battery problems and deep discharge
The Redmi 4 Pro is equipped with a 4100mAh non-removable battery. Over time, the battery life is depleted, and it can stop holding the charge or go into a state when the controller blocks charging for safety reasons.
If the phone has been lying low for a long time, it takes time to "rock" and connect the device to a powerful charger and leave it for at least 30-60 minutes, even if the screen does not light up.
| Status of the indicator | Probable cause | Action |
|---|---|---|
| It's not burning. | Deep discharge or chain break | Charge 1-2 hours, check the cable |
| Blinks orange | Low battery charge | Leave on the charger until the logo appears |
| Burning red. | Critical charge or error | Try to switch on the buttons |
| Blinks blue/white | Recovery mode (Recovery) | Select Reboot item from the menu |
There is a so-called “heating method” that sometimes helps to reanimate lithium-polymer batteries that have lost chemical activity in the cold or from old age. Carefully heat the back cover of the smartphone (with a dryer at minimum temperature or on a warm battery) for 2-3 minutes, then immediately connect the charging.
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Never use an open fire or microwave to heat the battery, which will cause swelling and possible fire, let's only allow for moderately warm air.
Enter Recovery and Fastboot Mode
If the smartphone responds to buttons but does not load the operating system, Android system files may be damaged. In this case, you need to try to enter recovery mode. Xiaomi is characterized by two main modes: Recovery and Fastboot.
To enter Recovery, press the volume button and the power button at the same time. Hold them until the orange and gray button menus appear. If the screen lights up and the menu appears, select a language (usually English/Chinese) and go to Reboot, then Reboot to System.
Fastboot mode is used to flash the device through the computer. To enter it, press the volume down and power. The screen should show a hare fixing an android that says Fastboot. If this mode is available, then the hardware of the phone is probably good.
Wipe Data is also available in the Recovery menu, and only use it if you're willing to lose all your data, because it's a factory reset, and it's a last resort when a software conflict keeps the system from booting.
Software failures and flashing
Often the reason Redmi 4 Pro doesn’t turn on is because of a failed update or application conflict: If the phone goes into an endless bootloop or hangs on the logo, an intervention via the PC is required.
You will need the Mi Flash Tool and the official firmware for your model. It is important to download the version specifically for the Redmi 4 Pro (codename prada), since the firmware from the regular Redmi 4 can “brick” the device forever.
adb reboot bootloaderThis command, entered in the command prompt when the phone is connected (if the ADB is working), will put the device into bootloader mode. If the phone is not detected by the computer at all, it may be the drivers or the cable that is the problem.
⚠️ Note: Unlock Bootloader Reflashing requires application on the site MIUI You can't change the region or the software version without the unlocked bootloader, you can't change the region or the version of the software.
The firmware process requires a stable connection. Use the original. USB-cable USB 2.0 on the computer motherboard (back of the system unit), as the ports of the front panel can give voltage drawdowns.
Hardware malfunctions and repairs
If none of the software methods worked, and the phone doesn't show signs of life even in Fastboot mode, hardware breakdown is likely. In Xiaomi Redmi 4 Pro, a common problem is the chip or power controller dump due to overheating or impacts.
Also, the battery itself often fails, if it is swelling, it must be replaced urgently, as this can damage the screen or body, and you can check the status of the battery by carefully opening the back cover (it is held on latches and glue).
Diagnostics of the motherboard requires special equipment, such as a multimeter and a power supply to check the current consumption. If the current is 0.00A when connected to the laboratory power supply, or vice versa, it goes into a short circuit (0.5A+ without starting), repairs are necessary in the service.
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If the phone does not turn on after a fall or water hit, self-repair without experience can lead to a complete failure of the device - it is better to consult specialists.
The cost of repairs can vary depending on complexity: Replacing the battery or charging connector is inexpensive, whereas soldering the processor or replacing the power controller may not be economically feasible for the 2016 model.