Why Xiaomi Redmi 9 stopped turning on and does not take charge?
Your Redmi 9 suddenly became a brick: it doesn't show signs of life when you press the power button, it doesn't display a charging indicator, and a connection to the network or a computer doesn't give any reaction? This problem is more common than it seems - and causes can range from a trivial battery discharge to serious hardware malfunctions. In 80% of cases, the phone manages to "reanimate" on its own without resorting to the services of a service center.
The key is not to panic or try to disassemble the device immediately. Start with simple steps: check the cable, power supply and charging port. Then move on to software methods (for example, forced reboot or firmware via Fastboot). If the problem lies in the hardware — battery, power controller or motherboard — without repair, in this article we will discuss all possible causes and ways to eliminate them, from the most obvious to exotic.
The Redmi 9 (M2003J15SC, M2003J15SS, M2004J19C) is sensitive to voltage surges and poor-quality chargers. Even if you used a native power supply, the contacts could oxidize over time and the battery could degrade, so it's best to start with external factors, not internal components.
First steps: checking charging and power
Before you sin on hardware malfunctions, make sure the power supply isn't the problem.
- 🔌 Change the cable and power supply.Use the original Xiaomi adapter (5V/2A or 9V/2A) Cheap cables often have damaged veins, which leads to intermittent charging.
- 🔍 Check the port. USB-C. Light up with a flashlight: there should be no debris, dust or bent contacts inside. If contamination is detected, clean the port gently with a wooden toothpick (not a metal object!).
- 🔋 Try another nest or power source. Connect the phone to USB-A computer port, power bank, or other outlet, sometimes the problem is a faulty outlet or a network filter.
- ⚡ If the phone is dead, wait 15 to 30 minutes after charging — sometimes the indicator does not immediately light up.
Important nuance: Redmi 9 may not show any signs of charging if the battery is completely discharged or out of order. In this case, try holding the power button for 10-15 seconds, sometimes helping to wake up the power controller. If there is no reaction, move on to the next steps.
⚠️ Note: Do not use “fast” charges from other devices (for example, from Samsung or iPhone) – they can give out incompatible voltage and damage the power controller Redmi 9.
Forced reset and reset settings
If the phone doesn't respond to the power button, but you're sure the battery isn't dead (for example, it took several hours to charge), try hard reset, which works even if the screen is black and there's no reaction to touch.
For Redmi 9, the procedure looks like this:
- Press the Power + Volume Up button for 10-15 seconds.
- Release the buttons when the Xiaomi logo (or vibration) appears on the screen.
- If the phone boots up, the problem was a temporary system failure. If not, repeat the procedure 2-3 times.
If a hard reset doesn’t help, try to enter Recovery mode:
- Turn off the phone (if it is on).
- Press Power + Volume Up until the Recovery menu appears.
- Select the Wipe Data (reset settings) item using volume buttons and confirm with the power button.
Warning: Reset will delete all data on your phone (photos, contacts, messages) if it is not synced with Mi Account or Google.
I tried a forced reset.|I've connected the original 30 charger.+ minute|Checked the port. USB-C polluted|Make sure the battery doesn't swell.|Save important data (if the phone is switched on occasionally)-->
Diagnostics of battery and power controller
If the phone doesn't show signs of life even after it's reset, the problem could be in the battery or the power controller.
Signs of a faulty battery:
- 🔋 The phone is turned on only when charging is connected, but turns off immediately after disconnecting.
- 📉 Fast discharge (from 100% to 0% in 1-2 hours) or sudden shutdowns at 20-30% charge.
- 🔥 Bloating of the body (especially noticeable if you put the phone on a flat surface and spin - it will "swing»).
Signs of a problem with the power controller:
- ⚡ The phone does not charge from any cable / unit, but it can be switched on from the power bank.
- 🔌 The charge is intermittent (it goes, it stops without a reason).
- 💥 Smell of heat or heat in the port area USB-C.
For accurate diagnosis, you can use a multimeter (if you have it at hand):
| Parameter | Normal value. | Sign of malfunction |
|---|---|---|
| Battery voltage (no load) | 3.7–4.2 V | Less than 3.0 V – deep discharge, more than 4.3 V – overcharge |
| Resistance of USB-C port | 0.5-1.0 Om | More than 2 ohms – break of contacts, 0 ohms – short circuit |
| Charging current (with the connected unit) | 0.5–2.0 A | Less than 0.1 A – faulty cable or unit, more than 2.5 A – risk of overheating |
Critical information: If the Redmi 9 battery is swelling, immediately stop charging attempts and retrieve it (at the service center)!
How to safely remove the battery from Redmi 9?
Fastboot firmware: if the phone is determined by a computer
If Redmi 9 doesn’t turn on, but the computer sees it (for example, it makes a connection sound). USB-You can try to flash your phone through Fastboot mode, which will help if the problem is a software failure (for example, after a failed update or virus).
You'll need:
- 🖥️ Windows computer 10/11 (or Mac/Linux driverless ADB).
- 🔗 Cable USB (preferably original).
- 📦 Firmware for Redmi 9 (download from the official Xiaomi website or forum) 4PDA).
- 🛠️ Mi Flash Tool (for Windows).
Step-by-step:
- Install ADB and Fastboot drivers (for example, via Mi PC Suite).
- Turn off your phone. Press Power + Volume down for 5-10 seconds to log into the Fastboot.
- Connect your phone to your computer. The Android Bootloader Interface should appear in the Device Manager.
- Launch the Mi Flash Tool, select the downloaded firmware (.tgz format) and press Flash.
- Wait for the process to finish (5-10 minutes) and the phone will reboot automatically.
⚠️ Note: Fastboot erases all data on your phone, including photos and apps. If you have Find My Device or Mi Account enabled, you may need to enter a password from your Xiaomi account after you have firmware.
1. Reinstall drivers manually through Device Manager.
2. Use another USB-port (preferably) USB 2.0).
3. disable the antivirus (it can block access to the firmware).-->
Hardware repair: when without service can not do
If all software methods have been tried and the phone still doesn't turn on, the problem is likely hardware. Here are the most common Redmi 9 malfunctions and their signs:
| Malfunction | Symptoms | Cost of repair (2026) |
|---|---|---|
| Battery failure | Does not hold charge, bloating, the phone turns off at 30-50% | 1 200–2 500 ₽ (work) |
| Damage to the Power Controller (PMIC) | It doesn’t charge, it doesn’t turn on, but the computer can see it. | 2 000–4 500 ₽ (depends on the chip model) |
| Oxidation/break of USB-C contacts | Charging is only in a certain position of the cable. | 800–1 500 ₽ (port-change) |
| Short circuit on the motherboard | Phone warms, smell of burning, does not respond to charging | 3 000–6 000 ₽ (diagnostics + repair) |
Repairing these malfunctions yourself is possible, but requires experience with soldering equipment and knowledge of circuitry. For example, replacing the battery is relatively simple (if you have B-7000 glue and plastic blades), but repairing the PMIC or soldering the USB-C port at home can cause the phone to break down.
Where to find the master?
- 🏢 Xiaomi official service centers – a guarantee of 6-12 months, but more expensive by 20-30%.
- 🔧 Local workshops are cheaper, but check reviews and ask for a guarantee.
💡
If the phone has fallen into water or been in a wet environment, don't turn it on! Immediately remove the battery and dry the board in rice or silica gel for 24 to 48 hours. Attempting to turn it on before drying can cause corrosion and permanent damage.
What if the phone is turned on but is not working properly?
Sometimes, after the resuscitation, Redmi 9 starts to glittle: spontaneously reboot, brake or discharge in a few hours, these are signs of the consequences of deep discharge or damage to system files.
- 🔄 Reset the settings to factory through Settings → The phone. → Resetting settings.
- 🔋 Calibrate the battery: Charge the phone to 100% and don't turn off the charge for another 2 hours. Discharge until it automatically shuts down. Repeat the cycle 2-3 times.
Check for viruses.
Malwarebytes
Dr.Web Light
Update the firmware
Settings → Updating the system
If problems persist, install custom software (such as LineageOS or Pixel Experience) – this can help if the failure is caused by errors in the official MIUI firmware. However, keep in mind that custom firmware deprives you of warranties and may contain bugs.