How to turn on Xiaomi Redmi Note 4 without a power button: from charging to disassembling

Why the Redmi Note 4 button breaks more often than others

Power button on Xiaomi Redmi Note 4 (The codename mido is one of the most vulnerable parts of the smartphone, according to service centers, which is a very common name. 30% The reason for the breakdown of this model is precisely the malfunction of the mechanical button, and the reasons range from banal wear (plastic latches inside the button are erased after the end of the process). 100-150 Thousands of presses) before moisture or mechanical damage after falls, especially when the problem is present. 2-3 years of operation, when the contacts are oxidized, and the spring mechanism loses elasticity.

To make matters worse, without a power button, the smartphone becomes a brick: it can’t be downloaded in the standard way, connected to a PC for diagnostics, or even sold. However, there are workarounds, from software tricks to hardware manipulations. In this article, we’ll look at all the working methods, including those that don’t require disassembling the phone and are suitable for users without technical skills.

It's important to understand that not all of these things are universal. For example, if the battery is completely drained, none of the software methods will work, you'll need to apply power to the board first. And if the button is stuck in the pressed position, some instructions may short-circuit. So before you start, carefully study the warning section and select the method that suits your situation.

Method 1: Booting through connection to charger

The easiest and safest method, which works 60-70% of the time if the battery is not fully drained, is that the Redmi Note 4 supports automatic boot when connected to a power source, even if the power button does not work.

• 🔌 Use the original cable and power supply from Xiaomi (5V/2A). Cheap analogs may not provide enough current to initiate a load.
• ⏳ Keep your phone on charge at least 15-20 Sometimes the power controller blocks the display of charging until the minimum voltage level is reached.
• 🔄 Try to turn off/connect the cable several times, sometimes it helps to wake up the power controller.
• 🌡️ If your phone is overheated before it breaks, let it cool down. 30-40 Overheating can block the load until the temperature normalizes.

Algorithm of action:

1. Connect the Redmi Note 4 to the charger.
2. Wait 5-7 minutes – sometimes the loading does not happen immediately.
3. If the screen is not responding, press the combination Volume up + Volume down for 10-15 seconds. This can simulate the on signal.
4. If the Mi logo appears but further download stalls, try holding Volume up for the Recovery Mode entrance.

⚠️ Warning: If the phone gets hot after charging, but doesn't turn on, turn it off immediately! This may indicate a short circuit in the power supply.

Method 2: Use of the ADB-commands (for unlocked loader)

If your Redmi Note 4 previously unlocked a bootloader and enabled USB debugging (Settings → Developers → USB debugging), you can turn your phone on via your computer using Android Debug Bridge (ADB), a method that works even with a fully discharged battery if the phone is connected to a power source.

Before starting, make sure that:

• 🖥️ On the PC installed Xiaomi drivers and package ADB Tools.
• 🔌 The phone is connected to the PC with the original cable (cheap cables often don’t transmit data).
• 🔄 The phone had previously been debugged. USB And access is allowed from this PC.

Instructions:

1. Connect Redmi Note 4 to your computer and open the command line (Win + R → cmd).
2. Enter the command to check the connection: adb devices If the phone is determined (the serial number will appear), move to the next step. If not, try another button combination (volume up + USB connection).
3. Send the command to turn on: adb shell input keyevent 26 Code 26 corresponds to the event of pressing the power button.
4. If the phone doesn’t respond, try an alternative command: adb shell reboot.

If the commands didn't work, the phone might be off. USB-In this case, only the hardware method will help (see Method 4).

⚠️ Warning: Do not use the adb shell reboot bootloader or fastboot reboot commands on a locked bootloader! this can lead to a hard brick (total phone failure without the possibility of recovery through standard methods).

Method 3: Log in to Recovery Mode and Reboot

If the power button doesn't work, but the volume buttons are working, you can try logging into Recovery Mode and initializing a reboot from there. This method works 40-50% of the time and doesn't require a PC connection.

Algorithm of action:

1. Make sure the phone is connected to the charger (even if the indicator is not on).
2. Press Volume up + Volume down and hold for 15-20 seconds. On some firmware, this mimics the on signal.
3. If the Mi logo appears, immediately press Volume Up to enter Recovery.
4. In the Recovery menu, select Reboot. → Reboot to System (control – volume buttons, choice – power button, but if it does not work, connect) OTG-mouse-cloth).

If standard Recovery does not open, try an alternative method:

• 🔌 Connect your phone to charge.
• 📱 Hold the Loud up. + Volume down and, without letting go, connect OTG-cable USB-mouse.
• 🖱️ If the mouse cursor appears on the screen, click on Reboot.

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If the phone is turned on but the power button is not working on the system, install the Button Mapper app from Google Play.It allows you to reassign the on/off function to other buttons (for example, increase/down volume).

Method 4: Disassemble the phone and mechanically press a button

If the software methods don't work, you'll have to disassemble, which is a neat thing, but it's a novice thing if you follow the instructions, and the rule of thumb is, don't put too much effort into it, because all the latches and plumes in Redmi Note 4 are fragile.

Tools required:

• 🔧 Plastic blade or mediator (to open the case).
• 🔩 Cross screwdriver (size) PH00).
• 🧲 Magnetic mat or screw container.
• 🔍 Lupa (optional, to inspect contacts).

Step-by-step:

1. Turn off the phone (if it is still responding to charging, wait for the full discharge).
2. Remove the back cover by putting a plastic blade on the bottom edge (there's a small gap there). Be careful, the lid is attached to the latches!
3. Unscrew 12 screws fixing the metal plate (they are of different lengths - remember the location of each so as not to damage the board during assembly).
4. Carefully remove the plate and disconnect the battery plume (it is glued, so put it with a spatula).
5. Find the power button – it is located to the right of the USB-It's usually a small plastic piece with a metal tongue.
6. Press the button tongue with tweezers or a screwdriver (no bigotry!). If the button jammed, try dripping a WD-40 drop on the mechanism.
7. Connect the battery back and try to turn the phone on.

⚠️ Warning: If you find traces of oxidation on the board during disassembly (green or white plaque), do not turn the phone on until the contacts are cleaned with alcohol.

Method 5: Close contacts on the board (emergency method)

If the power button is completely out of order and the disassembly doesn't work, you can try to close the power contacts directly on the board, which is risky and requires precision, but sometimes it's the only way to "resuscitate" the phone before you visit the service.

You'll need:

• 🔧 Multimeter (to check contacts).
• 🧵 Thin copper wire or tweezers.
• 🔍 Lupus and good lighting.

Instructions:

1. Disassemble the phone (see Method 4) and remove the metal plate.
2. Find the contacts of the power button on the board – they are located next to the connector for the button plume (usually marked as PWR_KEY or KPP).
3. Connect the battery and short-term (for 1-2 seconds) close the contacts with tweezers or wire. Do not hold it longer - it can burn the controller!
4. If the phone vibrates or the screen lights up, remove the tweezers immediately. Further retention of contacts can lead to a reboot cycle.

Critically, the Redmi Note 4 board has power circuits next to the power button contacts. If you're not sure, you can turn the wrong contacts off.

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Close the contacts on the board is a temporary solution. After successful switching on, replace the power button or the plume as soon as possible, as repeated manipulations increase the risk of damage to the board.

What to do if nothing helps: alternative solutions

If all of the above methods have not worked, consider the following options:

• 🔧 Replacement of the button plume. 4 Power button and volume buttons are combined into one plume (article: MDG000260). It'll cost you to replace him. 500-800 service-rate.
• 📱 Use of the OTG-If the phone is switched on but the button is not working in the system, plug in. USB-keyboard OTG and assign a key (for example, F12) Turn on/off via Button Mapper.
• 🔄 Firmware through EDL-If the phone is not turned on, but is defined by the computer as Qualcomm HS-USB QDLoader 9008, it can be restored through emergency mode using the Mi Flash Tool.However, it requires skill and is risky for beginners.
• 💰 If repairs are not feasible, you can sell a display, battery or camera (on the Redmi Note 4, demand is still high).

If you decide to contact the service, specify the following points:

• The cost of diagnosis (an average of 300-500 rubles).
• Warranty for repair (must be at least 3 months).
• Are original parts used (button plume for Redmi Note 4 must be from art. MDG000260).

FAQ: Frequent questions about turning on Redmi Note 4 without power button