Why Xiaomi Redmi 9 is not included: diagnostics and repairs with your own hands

Your Xiaomi Redmi 9 has stopped turning on, and you don't know what to do? This can be caused by both a simple battery drain and serious hardware malfunctions. 80% of the time, the phone can be "resuscitated" without going to the service center, just correctly identifying the source of the problem and performing a few simple actions.

In this article, we’ll look at all the possible reasons why Redmi 9 doesn’t turn on (including black screen, endless boot and no charging response), and give you step-by-step instructions for each case. We’ll focus on the hidden “chips” of MIUI firmware that can block startup after updates or resets. If you’re not a specialist, start with the first few things — often the solution lies on the surface.

1. Check for obvious reasons: charging and power button

Before you disassemble your phone or drop your firmware, eliminate the underlying problems. Start by diagnosing the charger:

• 🔌 Cable and Power Unit: Try charging your phone with another cable (preferably original from Xiaomi) and an 18W power supply. Cheap accessories often don't provide enough current to run a discharged battery.
• 🔋 Charging indicator: When connected to the network, a red/orange LED should light up. If the indicator flashes or does not burn at all, the battery or power card is a problem.
• 🔄 Alternative charging method: Connect your phone to your computer via USB — Sometimes it helps to wake up the power controller.
• 🕒 Charging time: If the battery is completely discharged, wait at least 30 minutes before trying.In some cases, it takes up to 2 hours.

If the charging indicator is working, but the phone does not respond to the power button:

• 🔘 Hang button: Press and hold the switch on 15-20 seconds – this will force the device to restart (analogue of “hard reset»).
• 🔧 Mechanical damage: Check if the power button is running out, and if so, you'll need to disassemble the contacts to clean up or change the button.

⚠️ Warning: If your phone falls or gets wet, don't plug it into charging! First check for corrosion or battery bloating. Charging a damaged device can short circuit.

2. Black Screen: Hardware vs. Software Causes

If the phone vibrates or makes sounds when you press the buttons, but the screen remains black, the problem is most likely in the display or the plume, and if the device is completely lifeless (no vibration, no sounds, no indication), the battery, power charge or processor is to blame.

To check the display, connect the phone to your computer and check if it's defined as a media device (Mi Phone in Windows Device Manager). If yes, the problem is exactly in the screen or backlight. If not, the malfunction is deeper.

Hard Reset: When and How to Do It

If the phone is stuck on the MI logo or reboots cyclically, a hard reset will help, which deletes all the data, but returns the phone to working condition. Redmi 9 has two ways to reset:

1. Recovery Mode (if the phone is responsive to the buttons):

1. Turn off the phone (if it doesn't turn off - hold the power button for 20 seconds).


2.Put Power + Vol Up before the Mi logo appears.




3. From the Recovery menu, select Wipe Data → Wipe All Data (manage volume buttons, confirmation – power button).




4. After reset, select Reboot → Reboot to System.

1. Fastboot (if Recovery is not available):

1. Install the Mi Flash Tool on your PC.


2. Press Power + Vol Down to enter the Fastboot (a hare in a hat-eared hat will appear).




3. Connect your phone to your PC and in the Mi Flash Tool, select Clean All for a full reset.

⚠️ Warning: After a hard reset, the phone will require you to enter the Mi Account that was previously linked. If you do not remember the data, use the pre-reset recovery service!

Download the latest firmware for Redmi 9 from the official website

Charge your phone to at least 50%

Prepare data from Mi Account (login and password)

Install Qualcomm drivers for Fastboot (if you use a PC)

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4. Problems after the MIUI update: how to restore the work

Redmi 9 is often “dyed” after automatic MIUI updates due to:

• 🐞 Firmware incompatibility (for example, installing a version for another region).
• 🔄 Interrupt updates (turning off the phone during the process).
• 🗃️ Memory shortage (update requires free space, but the system does not find it).

If the phone is stuck on the boot screen or cyclically rebooted after the update:

1. Try to retrace the previous version of MIUI via Fastboot:

1. Download stable firmware for your model (e.g. V12.5.3.0.RJCMIXM for global version).


2.In the Mi Flash Tool, select Clean All and Lock (this will delete all data, but bring the phone back to life).




3. After the firmware, reset through Recovery.

1. If the firmware doesn't work, check the EFS partition (stores IMEI and network settings), which damages leads to a brick. Recovery will require specialized software like QPST or Maui META.

On the Redmi 9. M2003J15SC) It's a common bug that damages the modem partition after an update. Symptoms: the phone turns on but doesn't catch the network. EDL-Mode (requires an authorized Xiaomi account).

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Before you run through Fastboot, disable the antivirus on your PC – it can block Qualcomm drivers, which will lead to the 0xc000007b error.

5. Bloated battery and other hardware malfunctions

If the Redmi 9 doesn't turn on or charge, and the body swells or smells, it's the battery that's to blame.

• ⚡ Use of non-original chargers (especially with output current) >2A).
• 🔥 Overheating (for example, if the phone was lying in the sun or playing heavy games without cooling).
• 🕒 Natural wear (life of Li-Pol batteries – 2-3 years).

How to check the battery:

1. Light a flashlight at the junction between the screen and the body, and if you see a gap or bloating, the battery needs to be replaced.
2. Try to press the back cover slightly in the battery area, and if the phone starts to turn on, confirm the malfunction.

Replacing the battery with Redmi 9 will cost 1,500-2,500 rubles in service.

• 🛠️ Buy the original battery (article: MB09 or DM-09).
• 🔧 Use plastic blades for disassembly - metal will damage the plumes.
• 🔋 After replacement, calibrate the battery: fully discharge, then charge to 100% without interruptions.

⚠️ Warning: Don't use a phone with a bloated battery! The risk of fire or explosion when charging is extremely high. If the battery has already deformed the screen, don't try to turn on the device.

6. Phone wet: what to do in the first 24 hours

If the Redmi 9 is caught in rain or drowns, act quickly.

Turn off your phone immediately (don’t press the buttons!)

Extract. SIM-memory-card

Dry the external moisture with a napkin (do not shake!)

Place your phone in a silica gel (or rice) bag for 24 hours

Don't plug in the charger!

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What can't be done:

• 🔥 Drying with a hair dryer or on a battery will damage the board and screen.
• ⚡ Connect to charging - short circuit guaranteed.
• 🛠️ Disassemble the phone without experience - you can damage the plumes.

After drying:

1. Try turning on your phone. If it doesn't respond, disassemble (or take it to the service) for cleaning with alcohol.
2. Notice the oxidation of contacts (green coating) that needs to be removed with isopropyl alcohol (>90%) and a toothpick.
3. If the phone turns on, but glitch (self-reboots, artifacts on the screen) – a diagnosis of the board is required.

Redmi 9 is most often affected by:

• 📶 Antenna module (after wetting, the network disappears).
• 🔊 Speakers and microphone (sound is distorted or completely lost).
• 🔋 Charging controller (phone not charged or charged with jerks).

7. When to contact the service: prices and guarantees

If you’ve tried all the ways, but the Redmi 9 still doesn’t turn on, it’s time to contact the specialists. Here are the approximate repair prices (2026):

Where to look for service:

• 🏢 Xiaomi Official Centers: Repair warranty up to 1 year, but prices are higher.
• 🔧 Local workshops: Cheaper, but check reviews. Pay attention to the availability of diagnostic equipment (for example, DC Power Supply to check the board).

⚠️ Warning: If the phone is warranty (up to 12 months from the date of purchase), do not disassemble it yourself! Opening the case will void the warranty. Contact the authorized Xiaomi service center with a check.

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The most expensive repairs are to recover from getting wet and replace the motherboard if the cost exceeds 70% of the price of the new Redmi 9 (about 10,000). ₽ In 2026, it is more economical to buy a new phone.

FAQ: Frequent questions about Redmi 9 malfunctions