Replacement of buttons on Xiaomi: from diagnostics to installation of new elements

The physical buttons on Xiaomi smartphones and smart devices are some of the most vulnerable design elements. Over time, they start to stick, stop working or fall off after falls. If your Redmi Note 12 does not respond to the power button press, and the Mi Band 7 ignores touch key touch, don’t rush to bring the equipment to the service center. 80% of the time, the problem is solved by self-replacement, and this article will help you get it right.

We will analyze not only classic mechanical buttons (turn on, volume control), but also sensory elements on fitness bracelets, remotes Mi. TV And even the joysticks of the Xiaomi Gamepad, and we're going to focus on diagnostics, because users often confuse hardware malfunctions with software failures. MIUI If the volume button stopped working, it might not be the physical module, it might be the firmware.

In the manual you will find:

• 🔧 Step-by-step instructions for different types of devices (smartphones, bracelets, TV remotes)
• 🛠️ Lists of tools with alternatives for home conditions
• ⚠️ Critical errors that lead to a breakage of the board or display
• 💰 Comparison of prices for original and non-original buttons

1.Diagnostics: How to Determine If a Button Is Really Broken

Before disassembling the device, make sure that the problem is in the mechanical part. Here are 3 tests to help rule out software failures:

1. Check through the engineering menu On Xiaomi smartphones enter the code ##4636##, Then go to Testing. → Single Test → Click on the problem button if a reaction appears on the screen (for example, KEY_VOLUMEUP), It's physically intact. It's not responding to a module or a plume that's malfunctioning.
2. Resetting settings On devices with MIUI Go to Settings. → The phone. → If you reset the button, it's the software, not the hardware. F5 redmi K60 post-update MIUI 14 may be observed false triggering of the power button - this is a firmware bug, treated by rollback to a stable version.
3. Visual inspection: Hold the device to a bright light and look at the gaps around the button. If you see backlash, cracks in the body or traces of oxidation, it's 100% hardware failure. Mi Band bracelets often leave the touch button contact area, which you see when you disassemble it.

If all the tests have confirmed a malfunction, move on to a replacement, but first prepare the tools.

2. Replacement tools: what will be needed and what can be replaced

Xiaomi devices need a minimal set of tools to disassemble, but some are critical — without them, you risk damaging plumes or the body.

For the Mi Band bracelets and smart watches Xiaomi Watch will additionally require an ultrasonic bath (if the button stuck due to moisture) or isopropyl alcohol to clean the contacts. TV Enough cross screwdriver and multimeter to check the chain.

⚠️ Warning: Don't use metal blades to tweak the case of smartphones! Even a small scratch on the aluminum frame of the Redmi Note 11 Pro or Xiaomi 13 can become a hotbed of corrosion. Plastic tools cost pennies, but will preserve the appearance of the device.

Check the device model and buy a compatible button

Reduce the battery to 30% (for smartphones)

Prepare a workplace with good lighting

Take it off. SIM-card and memory card (if any)

Photograph the disassembly process for reverse assembly-->

3. Replacement of power button on Xiaomi smartphones: Step-by-step

The power button (also known as the on/lock button) is most often broken due to mechanical wear. X3 mi 10T It's integrated into a single module with a fingerprint scanner, so you can't replace it separately, you have to buy the entire unit. On newer devices (for example, Xiaomi 12), the button is separate, which makes it easier to repair.

Instructions for smartphones with a removable back cover (for example, Redmi) 8A):

1. Turn off the phone and remove the tray. SIM-map.
2. Push the back cover with a plastic spatula, starting at the corner near the headphone jack.
3. Unscrew 6-8 screws that fix the middle frame.
4. Carefully disconnect the battery plume (it is usually glued).
5. Find the power button module – it is located on the right side of the board, under a metal screen.
6. Seal the old button with a soldering iron (power not more than 30 W!) or disconnect its connector (if it is on the train).
7. Set a new button, assemble the device in reverse order.

For smartphones with a non-removable cover (for example, Xiaomi) 11T) trickier:

1. Warm up the screen edge with a hair dryer (temperature 60–70)°C) for 2-3 minutes.
2. Put the suction on the display and gently lift it (do not tear it off completely - there are plumes below!).
3. Disconnect the battery plumes and the display.
4. Remove the metal plate that closes the power button.
5. Replace the module, assemble the device by pre-cleaning the old glue and applying a new one.

On models with built-in fingerprint scanner (e.g. Poco) F4) After changing the button, you may need to recalibrate the sensor through the engineering menu (##6484##).If the scanner is not working, check the connection of the flexible plume.

4. Volume button repair: nuances for different models

Volume control buttons are more likely to suffer from dust or moisture than mechanical damage. On Redmi and Poco, they are usually located on the same module, and on Xiaomi flagships (for example, 13 Pro) they are divided into two separate microbuttons, which affects the complexity of replacing.

General instruction:

• 🔩 Unscrew the screws on the middle frame (their number varies from 4 to 10).
• 🧲 Remove the metal plate covering the buttons – it is usually glued to a double-sided tape.
• 🔍 Inspect the spring mechanism: if it bends, try straightening it with tweezers before replacing it.
• 🔌 Unpold old buttons or unplug their plume (depending on the model).
• 🆕 Set new buttons, making sure the springs are in place.

On Xiaomi Mi. A3 And Redmi Note 8 Pro, the volume buttons are often drowned by the wear of silicone pads, so you don't have to change the entire module, you just have to put a piece of thin foam under it (about 0.5 mm thick), which is a temporary solution, but will prolong the life of the buttons by 6-12 months.

For devices with IP-certification (e.g., Xiaomi) 12S Ultra, after the buttons are replaced, you will need to restore tightness. Use ultraviolet adhesive (for example, use UV adhesive, LOCTITE 3321) and irradiate the seams with a UV lamp for 2-3 minutes.

⚠️ Attention: On Poco F3 redmi K40 Volume buttons are connected to the vibrator with one train. If the vibrator stops working after the replacement, check if you have damaged the contacts on the flexible board.

5. Replace touch buttons on fitness bracelets and smartwatches

On the Mi Band. 6/7 Xiaomi Watch S1 There are no physical buttons, instead of touch zones, if the wristband doesn't respond to touch, the problem may be that the buttons are not touching:

• 💧 Moisture getting under the screen (a common problem after the pool).
• 🔋 Discharged battery (at a charge level below 5%, the sensor is turned off).
• 🛠️ Detachment of the plume connecting the sensor to the board.
• 🖥️ Firmware failure (for example, after updating through Mi Fitness).

The following is a step-by-step guide for Mi Band 7:

1. Remove the capsule from the bracelet, undercoating it with a plastic spatula from the charging connector.
2. Unscrew 4 screws on the back cover (use a screwdriver). Y00).
3. Carefully disconnect the battery - it is glued, so put it on the shoulder blade.
4. Find a flexible plume of the touch button (it goes from board to screen).
5. Check the circuit with a multimeter: the resistance between the sensor contacts should be 5-10 kOhm.
6. If the stain is damaged, replace it (cost). ~200 ₽). If the problem is in the payment, you will need a soldering iron.

For the Xiaomi Watch S1 It's more complicated because of the sealed housing, and you'd better use a thermo-air station to warm up the body evenly without damaging the screen.°C - otherwise the battery-locking glue will be damaged.

If the sensor still doesn't work after the plume is replaced, try resetting the bracelet to factory settings via the Mi Fitness app. Sometimes the failure occurs due to a data conflict in the device's memory.

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Before disassembling the Mi Band, put the bracelet in a silica gel bag for 12 hours - this will remove moisture from under the screen and can return the sensor to work without repair.

6. Replace buttons on Xiaomi remotes TV and other accessories

Buttons on the Mi remotes TV Stick, Xiaomi TV Box and Redmi AirDots wireless headphones break less often, but their replacement has its own nuances. The main difficulty is the miniature size of parts and fragile plastic latches.

Instructions for the Mi remote TV Remote (model) R2):

• 🔧 Unscrew the screw under the battery compartment (sometimes it is hidden under the sticker).
• 🔓 Disconnect the body, carefully poke latches with a plastic blade.
• 🖱️ Remove the board with buttons – it is attached to 2-3 plastic racks.
• 🔍 Check the current tracks under the rubber buttons, and if they're erased, restore them with graphite pencil (a temporary solution) or replace the board.
• 🆕 Install new buttons (they are sold sets of 5-10 pieces for 100-150) ₽).

For Xiaomi. TV Box S and Mi Box 4 buttons often fail due to wear and tear of the spring contacts:

1. Buy a remake of buttons (~200 ₽).
2. Use springs from an old computer keyboard (suitable with Cherry) MX switch).
3. Put a piece of foil under the button for better contact.

On Redmi AirDots 3 wireless headphones, the control button (touch or mechanical) often stops working after sweating.

1. Disassemble the body, warming it with a hair dryer (temperature 50–60)°C).
2. Clean the contacts of the button with isopropyl alcohol.
3. If the button is mechanical, replace it with a new one (the article depends on the version of the headphones).
4. For touch buttons, check the integrity of the flexible plume.

7.Where to buy buttons for Xiaomi: original vs analogues

The cost and quality of the buttons vary greatly depending on the vendor, and here is a comparison table for popular models:

The original buttons can be found in Xiaomi's branded stores or from official distributors (like Merlion).

• 🔘 Less clear triggering (especially on volume buttons).
• 🎨 Different shade of plastic (noticeable on light cases).
• ⚡ Service life 1.5-2 times less than the original.

Before you buy, check the button article, which is listed on the part itself or in the device diagram (you can find it on sites like iFixit). 10 The power button has an article MDY-001-16S, and Xiaomi 11 Lite — KB2003-001.

⚠️ Attention: AliExpress often sells "universal" buttons that fit multiple models. In practice, they are rarely 100% compatible - check customer reviews with your device model. For example, the button for the Redmi Note 9 will not fit the Note 9 Pro due to different mounting pitches.

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Before buying a button, specify the type of button: mechanical (spring) or membrane (touch), installation of the wrong type will lead to the failure of the device.

8. Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing buttons.

• 🔌 Damage to battery plume when disassembling a smartphone.Always turn off the battery first thing - even a discharged battery can cause a short circuit.
• 🔥 Overheating board when soldering. Use a soldering iron with a power of no more than 30 watts and solder with flux RMA-223. Sting temperature - 280-300°C.
• 🧲 Loss of screws or springs. Work on white fabric or use a magnetic mat - this will help you not lose small parts.
• 💧 When you build your smartphone, only apply glue to the edge of the case, avoiding the area around the buttons and connectors.
• 🔄 Wrong build. For example, Xiaomi. 12T if the middle frame is not installed correctly, the volume button can press on the camera plume, which will lead to artifacts in the photo.

Another common problem is the floating symptoms after replacement, like the button is late, or it's on its own.

• Bad contact of the plume (check the fixation of the connector).
• Oxidation of contacts on the board (clean with alcohol).
• Incompatibility of the replaced button with firmware (relevant for devices with built-in fingerprint scanner).

If you have replaced the power button with Poco X4 Pro or Redmi K50 It stopped turning on the screen, but the device charges — check the integrity of the display plume. When disassembling it is easy to damage, and then you need to replace the entire display module.

FAQ: Answers to Frequent Questions