Xiaomi Redmi 9T does not turn on: all ways of “resuscitation” from simple to complex

Why Xiaomi Redmi 9T may not be included?

Your Redmi 9T has stopped responding to the power button, the screen is black, and the charging indicator is not on? The reasons for this behavior can be many, from a banal battery discharge to serious hardware failures. Before you carry your phone to the service center, try to diagnose the problem yourself and fix it at home.

In this article, we will look at all possible scenarios, from the elementary (for example, a faulty charging cable) to complex (for example, damage to the motherboard). It is important to understand that some manipulations require caution: wrong actions can make things worse. If you are not confident in yourself, you better contact the professionals.

Let’s start with the simplest and safest methods that do not require disassembly of the device or special skills.

1. Charging check: basic steps

The first thing you need to do is make sure that the power supply is not the problem, and even if you "know" that the charger is working, check it again.

• 🔌 Get Redmi on board. 9T to another charger (preferably original or Xiaomi certified) and use a support cable USB Type-C.
• 🔋 Try charging your phone from a computer or laptop – sometimes USB-The PC port is not giving enough current, but at least it will show whether the device is responding.
• ⚡ Leave your smartphone on charge for at least 30 to 60 minutes. If the battery is completely discharged, the first signs of life may not appear immediately.
• 💡 Check the charging indicator: on Redmi 9T It's on the right of the front camera, and if it flashes or it's red, the battery charges.

If you've been doing this, and the phone still doesn't show any signs of life, you can move on to the next step, but first make sure that the outlet or the outlet is not there. USB-The port you're connecting the charger to actually works, like plugging in another device (tablet, power bank) and checking it.

⚠️ Warning: Do not use cheap uncertified chargers or cables. These may damage the Redmi power controller. 9T, Which will lead to more serious breakdowns.

2. Forced reset (Hard Reset)

If your smartphone doesn’t respond to the power button, but you’re sure the battery is charged (like the light is on or the phone has recently turned off), try a forced reboot, which works if the device is stuck at the software level.

For Xiaomi Redmi 9T, the procedure looks like this:

1. Press the power button and the volume button at the same time.
2. Hold them for at least 10-15 seconds (sometimes up to 20 seconds).
3. If the screen catches fire (the Redmi or MI logo appears), release the buttons and wait for the system to boot.

If the phone is turned on after that, but it starts to work unstable (spontaneously restarts, brakes), this may indicate firmware damage or memory problems, in which case it is recommended to reset to factory settings (about this in one of the following sections).

Turn off the phone from charging (if connected)

Make sure the buttons are not stuck and pressed clearly

Try pressing the combination 2-3 times with an interval of 5 seconds

If it doesn’t work, move on to the next method.-->

Diagnostics of the battery: discharged or damaged?

One of the most common reasons why the Redmi 9T doesn’t turn on is because the battery is so low that if the phone was lying uncharged for a long time (weeks or months), the battery could run so low that the power controller blocks its charging.

In this case, a standard charger may not help. Try the following methods:

• 🔄 Use a powerful charger (from 18 watts and above). for example, the original from Xiaomi at 33 watts or charging from a laptop.
• ⚡ Connect your phone to charge and leave it for 2-3 hours, even if there is no sign of charging.
• 🔋 If possible, check the battery voltage with a multimeter. The normal value is 3.7-4.2 V. If it is below 3.0 V, the battery is deeply discharged and may require a "push" from another source (for example, a universal iMax charger). B6).

If the battery is swollen (as seen in the deformation of the back cover), it must be replaced urgently, and the use of such a battery is dangerous - it can damage the motherboard or even ignite.

⚠️ Note: If you decide to replace the battery yourself, use only the original battery or a certified analogue (for example, from Baseus or Remax). Cheap fakes can not only quickly fail, but also damage the phone.

4. PC connection: checking system response

If the phone doesn’t turn on, but you suspect the software is a problem (for example, after a failed update), try connecting it to your computer to see if the PC recognizes the device.

Here's what we need to do:

1. Connect Redmi 9T to your computer using USB Type-C cable.
2. Open Device Manager (Win + X → Device Manager).
3. See if a new device appears on the list (e.g. Qualcomm HS-USB QDLoader 9008 or MediaTek Preloader). If so, the phone is in emergency mode and you can try to "reanimate" it through firmware.
4. If the PC makes a connection sound, but the device doesn't show up, it's probably the driver problem. Install the Mi Flash Tool and the driver for Xiaomi.

If the computer does not respond to the connection, this can mean:

• 🔌 Faulty. USB-port on your phone (try to clean it from dust).
• 🔋 Full discharge of the battery (see previous section).
• 💻 Problems with the motherboard (requires diagnosis in the service).

💡

If the phone is defined as a Qualcomm HS-USB QDLoader 9008, it means that it is in EDL (Emergency Download Mode) mode. In this case, it can be flashed using the Mi Flash Tool, but beware - the wrong firmware can turn the device into a "brick".

5. Reset to factory settings (Hard Reset)

If the phone turns on but hangs on the MI logo or reboots cyclically, a factory reset will help, a method that will remove all data from the device but often solves software problems.

To do Hard Reset on Xiaomi Redmi 9T:

1. Turn off the phone (if it is on, press the power button for 10 seconds).
2. Press the power button + volume button and hold until the Recovery Mode menu appears.
3. Use volume buttons for navigation and power button to select the item.
4. Select Wipe Data → Wipe All Data (Wash All Data).
5. Confirm the action and wait for the process to be completed.
6. Choose Reboot. → Reboot to System.

If the phone turned on and was stable after the reset, the problem was the damaged system files or application conflict, and if the reset didn't work, it was probably the hardware (battery, motherboard, memory).

6. Flashing through Fastboot or EDL

If previous methods have failed, but the phone has any response to a PC connection (e.g., defined as Qualcomm... or MediaTek...), you can try to reflash it manually, an extreme method that requires caution.

You'll need:

• 🖥️ Computer with installed Xiaomi drivers.
• 📁 Official firmware for Redmi 9T (Download from en.miui.com).
• 🛠️ Mi Flash Tool (for Fastboot firmware) or SP Flash Tool (for MediaTek).

Attention, the wrong firmware can permanently shut down your phone, so if you're not sure what you're doing, you better go to the service center.

A brief guide to Fastboot:

1. Unpack the firmware archive in a folder.
2. Run the Mi Flash Tool and select the folder with the firmware.
3. Connect the phone to the PC by holding the volume button (to log in to Fastboot Mode).
4. In the program, press Refresh, then Flash.
5. Wait for the process to be completed (5-10 minutes).

If the phone is defined as Qualcomm HS-USB QDLoader 9008, will require firmware through EDL-This method is more complicated and requires an authorized Xiaomi account (for new models.

💡

Firmware via EDL is the last chance to “reanimate” the phone if other methods have not worked.However, this mode is often blocked on new Xiaomi devices (starting in 2021), and an official service may be required to unlock it.

7. When to contact the service center?

If none of these methods worked, the problem is likely hardware, and here are some signs that self-repair is pointless or dangerous:

• 🔥 The phone overheats when connected to charging.
• 💧 On the body or inside, traces of moisture are visible (oxidation of contacts).
• 🔧 The phone fell from a great height or was subjected to heavy mechanical stress.
• 🔋 The battery is swelling or deformed.
• 📱 The screen broke, and under the glass you can see cracks in the matrix.

In these cases, professional diagnostics are required. The cost of repairing the Xiaomi Redmi 9T depends on the breakdown:

Before you carry your phone to the service, check whether it is guaranteed. If so, contact the official service center Xiaomi, so as not to lose warranty service.

FAQ: Frequent questions about Redmi 9T malfunctions