How to disassemble the Xiaomi mouse yourself: instructions for all models

You may need to disassemble a Xiaomi mouse for many reasons, from basic dust cleaning to replacing micro-switches or batteries. Despite the compactness of the devices, the disassembly process does not require professional skills - enough patience, the right tools and knowledge of key nuances. In this article, we will discuss in detail how to safely open the case of the Mi Mouse, Mi Gaming Mouse and other popular models of the brand without damaging the latches or plumes.

It is important to consider that the design of Xiaomi mice is different from the classic devices of other manufacturers, often using hidden clips instead of screws, thin plumes instead of rigid connectors, and in wireless models – built-in batteries with custom connectors, we will show how to avoid typical errors (for example, damage to flexible boards during a sloppy opening) and share life hacks to simplify the process.

This article will be useful for both beginners and experienced users. If you have never mastered the technique, start by preparing the workplace and tools. If you already have experience, check out the specifics of PixArt optical sensor models. PMW3360 and PMW3389, where special care is required when working with the lens.

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need, and if you don't have even one tool, you can damage the body or the internal components, and here's the minimum set.

• 🔧 Plastic mediators or shoulder blades (2-3 pieces) - to separate latches without scratches.
• 🔩 Screwdriver kit: cross-haired PH00 (for most screws) and flat 1.5 mm (for clipping).
• 🧲 Magnetic mat or bowl – so as not to lose small screws and springs.
• 📸 Smartphone for photography – fix the location of parts before disassembling.
• 🧴 Isopropyl alcohol (90%+) and cotton swabs - to clean contacts and sensor.

If you’re disassembling a wireless mouse (such as the Xiaomi Mi Bluetooth Mouse or Mi Silent Mouse), prepare:

• 🔋 Multimeter - to check the voltage of the battery (normal: 3.7-4.2 V).
• 🔌 Thin tweezers - to disconnect battery plumes.

⚠️ Warning: Don't use metal screwdrivers to separate plastic latches! Even a small effort can lead to chips on the body. Xiaomi's mouse plastic is thinner than Lothtech's or Razer's models.

Also note that some models (such as the Mi Gaming Mouse Lite) have a two-part adhesive at the junctions of the body, in which case a hair dryer will be required to heat the seam to 60-70.°C (not higher!) or a special adhesive solvent (e.g. Loctite 7649).

Step-by-step disassembly: universal instruction for most models

The disassembly algorithm for most Xiaomi mice is similar, but there are nuances depending on the type of connection (wired / wireless) and the presence of additional buttons. Let’s consider the process with the example of Mi Bluetooth Mouse, one of the most popular models.

Step 1: Removal of the upper cover

Turn the mouse down with the wheel. Notice the 4 rubber legs, which can be screws (in models with a metal wheel) or clips (in plastic versions), carefully tuck the legs with a flat screwdriver or nail, they are usually attached to bilateral tape.

Then insert the plastic mediator into the gap between the top and bottom of the case (start from the button side). Smoothly drive the tool around the perimeter, pressing the latches. You will hear the characteristic clicks - this is normal. The main thing is not to make excessive effort: if the lid does not respond, check if all screws are twisted (sometimes they are hidden under the stickers!).

Remove rubber legs (if any)

Check for hidden screws under stickers

Use only plastic tools

Fix the location of details in the photo-->

Step 2: Disconnection of plumes and boards

After removing the cover, you will see:

• 🖱️ Micro-switched board (under buttons)
• 🔋 Battery (in wireless models)
• 📡 Bluetooth antenna (thin wire in black insulation)
• 👁️ Optical sensor (usually PixArt 3327 or 3360)

First, unplug the scroll wheel plume, which is the most fragile. Tuck it carefully behind the black lock (don't pull the wires!) Then turn off the button and sensor plumes. RGB-In addition, the backlight (for example, Mi Gaming Mouse) will be a board with LEDs - it also needs to be disconnected.

⚠️ Attention: In the mice Xiaomi Mi Silent Mouse, the train of the motion sensor is glued to the board with double-sided tape. Do not tear it off by force - warm up with a hairdryer for 10-15 seconds at minimum power.

If you are disassembling a wired mouse (e.g., Mi). USB Mouse, notice the soldered cable contacts to the board. They can't be disconnected without a soldering iron. In this case, you'd better take apart the mouse without disconnecting the board from the wire, or use a thermo-air station.

Step 3: Removing the optical sensor

The motion sensor is the most sensitive part of the mouse, and in Xiaomi models, it's usually covered with a transparent plastic lens that is attached to latches or glue, to remove the lens.

1. Carefully tuck it on the side with a plastic spatula.
2. If the lens is glued, warm it with a hair dryer (not higher than 50).°C).
3. After removal, clean the lens and sensor with a cotton swab dipped in isopropyl alcohol.

Never touch the sensor with your fingers! Fat marks or dust on the lens cause the cursor to "shake" or miss movements.In mice with PixArt sensors PMW3389 (For example, in Mi Gaming Mouse, the lens has an anti-reflective coating – it cannot be cleaned with abrasive materials.

Features of disassembling wireless mice Xiaomi

Wireless models (Mi Bluetooth Mouse, Mi Dual Mode Wireless Mouse) have two key differences from wired models:

1. Built-in battery – usually 18650 or polymeric on 3.7V.
2. Module Bluetooth/Wi-Fi — flat-board.

When disassembling such mice should:

In models with type-C A connection (e.g. Mi Dual Mode Wireless Mouse) often has the problem of pulling off the contact pad when the cable is not properly removed:

• 🔌 Integrity of soldered contacts on the board (use a magnifying glass).
• 🔋 Battery voltage multimeter (should be) ≥3.5V).
• 📱 Type-C connector state - often flexing fixation tongues.

To replace the battery in the mouse Xiaomi will fit standard elements 18650 capacity of 300-500 mAh (original usually 400 mAh). The main thing is to observe polarity and do not exceed the thickness of the battery by more than 0.5 mm, otherwise the case will not close.

💡

If after replacing the battery, the mouse discharges quickly, check the rest current with a multimeter (should be ≤High leakage current indicates a breakdown of the capacitors or diodes on the power board.

Cleaning and repair of internal components

One of the main reasons for disassembling the mouse is to clean the dust and dirt, and Xiaomi devices are particularly quickly contaminated:

• 🌀 Wheel scrolling - dust and hair accumulate.
• 🖱️ Optical sensor - the lens is covered with fatty plaque.
• 🔘 Micro-switches (Omronov or Kailh) – contacts are oxidized.

Use:

• 🧹 Soft brush - to remove dust from boards.
• 🧴 Isopropyl alcohol - for cleaning contacts and sensor.
• 🪛 Compressed air - for purging hard-to-reach places (pressure not more than 3 bar).

If the mouse double-clicks or doesn't press the buttons, the problem is most likely the micro-switches.

• Omron D2FC-F-7N (resource ~20 million clicks)
• Kailh GM 4.0 (resource) ~50 million clicks in game models)
• Huano (in budget options, resource) ~5 million clicks)

To replace the micro-switch:

1. Drink the old switch with a soldering iron (power 30–40W, temperature 300-350°C).
2. Clear the contact areas with alcohol.
3. Install a new switch, observing the polarity (marking «+» case).
4. Check the button before final assembly.

⚠️ Note: Mi Silent Mouse uses silent micro-switches with non-standard body height, and can only be replaced with similar ones (for example, Kailh Silent Red), otherwise the buttons will “hang” or not press until the end.

If the scroll wheel is scrolling in jerks or not fixed, the problem may be:

• Encoder (mechanical or optical) - requires replacement.
• The spring of the fixator is often lost during disassembly.
• Shaft contamination - clean with a cotton swab with alcohol.

💡

To extend the life of the micro-switches after cleaning, apply 1 drop of contact lubricant (such as Contact 61) to the moving parts. This will reduce friction and prevent oxidation.

Assembly of the mouse Xiaomi: the procedure and verification

The assembly should be in reverse disassembly order, but taking into account several critical points:

1. Trains - connect last so as not to squeeze them with the body.
2. Latches – make sure all clips are clicked (check by pressing the perimeter).
3. Screw screws – twist the cross to avoid skewing the board.

Before final assembly:

• 🔍 Check if there are any foreign objects (cogs, scotch clippings) inside).
• 📏 Make sure all cables and plumes are laid without tension.
• 🔋 If you have replaced the battery, charge the mouse for 30 minutes before the first switch on.

After assembly, test the mouse:

1. Connect to a PC and check the smoothness of the cursor’s movement (open Paint and draw lines).
2. Press all buttons – they should work without rattling or sticking.
3. Scroll the wheel - check the tactile recoil and the absence of jerks.
4. For wireless models, check the stability of communication (get away 5-10 meters from the PC).

If the mouse doesn't work:

• 🔄 Reconnect the plumes (especially sensors and buttons).
• 🔋 Check the polarity of the battery (in wireless models).
• 📡 Update drivers (for gaming mice with Mi Gaming Center software).

💡

If you're scrolling backwards after assembly, reconnect the encoder plume by flipping it 180 degrees. In some models, the connector is symmetrical, but the contacts are mirrored.

Common Mistakes and How to Avoid Them

Even experienced users sometimes make mistakes when disassembling Xiaomi mice.

Especially careful is the case with mice that have a glue-on body (e.g. Mi Compact Bluetooth Mouse), where you can't use acetone-based solvents, they corrode plastic.

• 🔥 Temperature-adjusted hair dryer (maximum 70)°C).
• 🧊 Cold method: Place mouse in freezer for 20 minutes (glue becomes brittle).
• 🧴 Special adhesive remover (e.g, 3M General Purpose Adhesive Cleaner).

If the mouse does not turn on after disassembly, but the battery is charged, check:

• 🔌 Fuse on board (can burn at KZ).
• 📱 Battery contacts – often oxidized.
• 🔧 Integrity of tracks under a microscope (especially near a Type-C connector).

Modding and upgrade of Xiaomi mice

If you take a mouse apart, you can not only fix it, but also improve it. Here are the popular modding options for Xiaomi models:

• 🎨 Replacement of buttons with Omron D2F-01F (50 million clicks or Kailh GM 8.0 (for gaming mice).
• 🔋 Installation of a larger battery capacity (e.g. 18650) 1000mAh staff-up 400mAh).
• 🖱️ Replacement of optical sensor with PixArt PMW3360 or PMW3389 (soldering).
• 🎛️ Addendum RGB-Illumination with control through the software (you need skills to work with Arduino).
• ⚙️ Replace the encoder of the wheel with a magnetic one (for example, Bourens Encoder for smooth scrolling).

To replace the sensor in the game mouse (Mi Gaming Mouse) will require:

1. Sweat out the old sensor (use the braid to remove solder).
2. Install a new sensor, combining contacts with the platforms on the board.
3. Set up CPI and polling rate via software (e.g. X-Mouse Button Control).

When upgrading the battery, take into account:

• 📏 Sizes – the new battery should not exceed the original by more than 1-2 mm.
• 🔌 The tension is just 3.7V (Lithium polymer or 18650).
• 🔋 Charge Controller – Xiaomi’s mouse is commonly used TP4056, power-proof 1A.

⚠️ Note: When replacing the battery with a capacity >1000mAh You may need to modify the housing (molding or removing the ribs of the stiffness) otherwise the lid will not close.

For addition RGB-I'll need lighting:

• 💡 WS2812B LED (light-emitting diode).
• 🔧 Microcontroller (e.g. Arduino Pro Micro).
• 📝 Firmware for controlling lighting (you can take a ready sketch for QMK).

The lighting is usually installed:

• 🔘 Under the buttons (with a diffuser of translucent plastic).
• 🌀 Around the scroll wheel.
• 🖱️ Under the body (for a "breathing" effect).

💡

Before modding, save the original mouse firmware! some models (such as the Mi Gaming Mouse) use a proprietary controller that can lock after a failed flashing.

FAQ: Frequent questions about the dismantling of mice Xiaomi