Why Xiaomi Redmi turns on and off: a complete elimination guide

Why the smartphone behaves like a “yo-yo”

Your Xiaomi Redmi has become a “perpetual engine” – it turns on 5-30 So, for a second, shows a logo or boot animation, and then shuts it down again? 8 Pro to Redmi. 12, And the reasons can be in hardware or firmware, and the key is not to confuse a cyclical reboot with a logo hanging. MIUI (It’s a different story) or a hardware breeze (when the phone doesn’t respond to buttons at all).

In 80 percent of cases, three components are to blame: battery, firmware, or motherboard contacts, less commonly, a damaged charging connector or a power controller glitch, and we'll take everything from simple (which you fix in 5 minutes) to complex (which require a soldering iron), and we'll also teach you to distinguish soft brick from hard brick (hard brick) so you don't waste time on useless manipulations.

⚠️ Warning: If the phone only turns on when connected to charging and immediately turns off after the cable is disconnected, this is the case. 99% The next step depends on the model: Redmi 9/9A/9C The battery is often drained, and the Redmi Note 10 Pro – the charge controller fails BQ25890.

1. Diagnosis: how to determine the cause by "symptoms"

Before you disassemble the phone, answer 4 key questions – this will narrow the range of possible problems:

• 🔋 Does the phone turn on without charging? If not, the battery or power supply problem.
• ⚡ Does the indicator show charging when you connect the cable? If it flashes red/orange, the controller may fail.
• 📱 Does the system boot up (desktop appears)? If so, it's the software or broken system files.
• 🔥 Does the case overheat during the reset cycle? Hot top edge is a sign of short circuit on the board.

For an accurate diagnosis, try these tests:

1. Test with a different battery, if you can, install a battery that's working. 8/9 batteries are interchangeable with POCO X3.
2. Test with another charger. Use the original power supply 5V/2A or 9V/2A (For models with Quick Charge).
3. Test in Fastboot mode. + The volume down for 10 seconds. If the phone stays in this mode stable, the problem is the firmware.

Programmatic reasons: from reset to flashing

If the phone can boot up the system (even for a few seconds), start with software methods. They're free and don't require disassembly.

2.1 Reset to factory settings via Recovery

This is the first step in suspecting a broken system file.

1. Turn off the phone (if it is in a cycle - wait for the moment when the screen goes out, and pinch the power. + Volume up for 10 seconds).
2. From the Recovery menu, select Wipe Data → Wipe All Data (use volume buttons for navigation, power for confirmation).
3. After resetting, reboot (reboot).

⚠️ Note: On Redmi models with a blocked bootloader, a reset may result in a request for a Mi Account. If you don't remember the password, don't reset, otherwise the phone will be locked!

Backup important data (if the phone is sometimes loaded)

Charge the battery by at least 50%

Make sure you know the username/password from Mi Account (if bootloader is blocked)

Have it on hand SIM-map (some models require unlocking)-->

2.2 Fastboot flashing

If the reset didn’t help, and the phone is stable in Fastboot mode (a black screen with a rabbit and the inscription Fastboot), try to reflash it with the official firmware.

1. Download the official firmware for your model (choose the Fastboot version, not Recovery).
2. Unpack the archive in a folder with the Mi Flash Tool (you can download here).
3. Connect your phone to your PC, launch the Mi Flash Tool, select the firmware folder and press Refresh (should appear) COM-port).
4. Press Flash and wait until it is finished (10-15 minutes).

Important: On models with a locked bootloader (Redmi Note) 8/9/10 Before the firmware, you need to unlock it through the official Mi Unlock Tool!

2.3. Firmware through EDL (advanced)

If the phone is not detected in Fastboot, but reacts to the connection to the PC (for example, a Qualcomm device appears). HS-USB QDLoader 9008 in Task Manager, so it’s in mode EDL. This is the last chance to bring the phone back to life without rationing.

To run through EDL, you will need:

• 🖥️ Windows PC 7/10 (Windows 11 There may be problems with drivers).
• 🔌 Cable USB Type-C with data support (not all charging cables are suitable!).
• 📁 Firmware in.mbn or.elf format (see for 4PDA model-themed).
• 🛠️ QFil or Mi Flash Pro for new models).

⚠️ Attention: Firmware through EDL It can lead to total loss. IMEI or network locking if you use unofficial firmware. Always check that your firmware files are compatible with your model!

3. Hardware causes: from battery to motherboard

If the software didn't work, the problem is the hardware, and let's start with the simplest one, the battery.

Checking and replacing the battery

A battery is the first suspect if:

• 🔋 The phone is only turned on when connected to charging.
• 🔥 The battery is swollen (check by putting the phone on a flat surface - if it sways, it's a sign of bloating).
• ⚡ The percentage of charge "jumps" (for example, from 50% immediately to 1%).

To replace the battery with Xiaomi Redmi you will need:

• 🔧 Setting screwdrivers (T3, T4, T5 cross-bow).
• 🧲 Screen removal suction cup (or plastic spatula).
• 🔥 Hair dryer or thermo-air station (for softening glue).
• 📱 New battery (we recommend to take the original or proven analogues from the ZOP, CB).

💡

Before replacing the battery, take a picture of the location of the plumes and connectors – on the Redmi Note 10 and later, they often differ from older models.

Step-by-step:

1. Turn off the phone and remove it. SIM-map.
2. Heat the back cover with a hair dryer (temperature) 60-70°C) and gently place it in a plastic blade.
3. Unscrew the screws holding the battery's metal plate.
4. Disconnect the battery plume (it is usually glued, pull carefully!).
5. Put a plastic blade on the battery (do not use metal – there is a risk of puncture!).
6. Install a new battery, assemble the phone in reverse order.

💡

If after replacing the battery, the phone still does not turn on without charging - the problem is in the power controller (PMIC) It's a multimeter diagnostic.

Checking contacts and plumes

Redmi's frequent problem 9/9A/9C — The battery or display contacts:

• 📱 Phone turns on, but screen doesn't work (backlights are, no images).
• 🔌 When you press the case in the battery area, the phone turns off.
• ⚡ Charging is only in a certain position of the cable.

What to do:

1. Take the phone apart (see instructions above).
2. Check all the plumes: batteries, display, power buttons.
3. If the contacts are oxidized, clean them with alcohol and eraser.
4. If the sleeve is broken, replace it (cost). 100-300 ₽).

⚠️ Note: On the Redmi Note 11 and later, the plumes are often soldered to the board!

Diagnostics of the motherboard

If the phone is warming, smells of smoke or reboots at intervals 5-10 Seconds, motherboards are to blame. Common problems:

To diagnose the fee, you will need:

• 🔍 Loop or microscope (to inspect the tracks).
• 📊 Multimeter (coupling of supply chains).
• 🔥 Smelting station (for replacement of components).

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If you don't have ration experience BGA-chips (e.g. eMMC or CPU), It's better to put the phone in service. The cost of repairing the board on the Redmi is between 1,500 and 5,000. ₽, depending on the complexity.

Particular cases: specific problems of models

Some Xiaomi Redmi models have "diseases" that are unique to them, and let's look at the most common ones.

Redmi Note 8 Pro: Charging Controller Failure BQ25890

This model is known for problems with the chip BQ25890, It's the one that's responsible for charging and distributing power:

• 🔌 The phone does not charge or only charges when it is off.
• ⚡ When connecting charging immediately turns off.
• 🔥 Corps warms up in the area USB-plug.

Decisions:

1. Try to flash the phone through EDL — Sometimes it helps to reset the controller.
2. If it doesn’t work, a replacement chip is required. BQ25890 (cost 500-800 ₽ + job).

4.2. Redmi 9/9A/9C: battery-pipe

Because of the cheap glue and the thin plumes, these models often lose battery contact.

• 📱 The phone turns on only if you press the case in the battery area.
• ⚡ The swelling is going to stop (it will stop).

Decision:

• Take the phone apart and check the battery plume.
• If the contact has gone, solder it or replace the plume (article for Redmi). 9A: XM-00001-01).

Redmi Note 10 Pro: overheating of the Snapdragon processor 732G

This model is prone to overheating due to a weak cooling system. If the phone turns off when you're loaded (games, video), try:

• 🧊 Replace the heatpaste on the processor (use Arctic) MX-4 kryonaut).
• 📉 Reverse to an older version MIUI (for example, MIUI 14 on MIUI 13).
• 🔧 Install a custom core with optimized energy consumption (e.g., FrancoKernel).

5.If nothing has worked: extreme measures

When all methods have been tried and the phone is still playing yo-yo, there are two options:

5.1. firmware via TestPoint (emergency mode)

If the phone does not respond to Fastboot or EDL, You can try to enter emergency mode through TestPoint, which requires disassembling and closing contacts on the board.

Instructions for Redmi Note 9:

1. Take your phone apart and find TestPoint (for the Redmi Note 9, it’s two contacts next to you). USB-connector, marked TP).
2. Connect your phone to the PC switched off.
3. Close TestPoint contacts with tweezers and hold 5-10 seconds.
4. The device manager should appear Qualcomm HS-USB QDLoader 9008.
5. Run your phone through QFil or Mi Flash Pro.

⚠️ Warning: TestPoint failure can cause the board to fail completely. If you're not sure, you should take it to the service.

5.2 Replacement of motherboard

If all the resuscitation efforts fail, the cost is to replace the fee.

• 📱 Redmi 9/9A/9C: 2000-3500 ₽.
• 📱 Redmi Note 8/9/10: 3500-6000 ₽.
• 📱 Redmi Note 11 Pro and newer: 6000-10000 ₽.

Where to buy:

• 🛒 AliExpress (cheap, but long wait).
• 🛒 Local service centers (expensive, but faster).
• 🛒 Groups in Telegram (for example, @xiaomi_repair).

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Before buying the board, check its compatibility by model number (printed on the sticker under the battery) and version (Global/China). Fees from Chinese versions (CN) They may not work with global firmware!

6 Prevention: How to avoid recurring problems

To prevent your Xiaomi Redmi from becoming a “perpetual reboot,” follow these rules:

• 🔋 Don’t use cheap chargers (especially with AliExpress without certification). Anker/Baseus.
• 📱 Do not drop your phone and avoid moisture (even if the model has protection). IP53).
• 📉 Update your firmware regularly, but don’t put betas (they often contain bugs).
• 🧹 Clean the charging connector from dust and debris (use a wooden toothpick, not metal objects!).
• 🔥 Do not overheat (do not play heavy games when charging, do not leave your phone in the sun).

💡

If you notice that the phone began to charge more slowly or spontaneously turn off when 20-30% The first sign of battery degradation is the charge charge, so replace it before it knocks out the power controller!

FAQ: Answers to Frequent Questions