Disassembly Xiaomi Mi S2: Complete guide from preparation to assembly

Xiaomi Mi Robot Vacuum-Mop S2 (Or just Mi. S2) — It's a popular smart-engineering model that combines powerful suction, wet cleaning and laser navigation, but even such a reliable device can require disassembly to clean internal components, replace brushes, battery or repair after a fall. In this article, we will discuss how to disassemble the Mi in detail. S2 without damage, what tools will be needed and what to pay attention to, so as not to turn a scheduled cleaning into an expensive repair.

It's important to understand that disassembling a robot vacuum cleaner is a very careful process. Unlike smartphones or laptops, there are no standard Torx or Pentalobe screws, and the body is held together by latches and hidden mounts. An error in the opening phase can cause plastic to crack or damage to sensors. If you've never disassembled this technique, we recommend that you first read the video instructions from experienced craftsmen.

This article will be useful for both beginners and those who have already experienced Xiaomi repairs, and we will reveal nuances that are rarely discussed in brief reviews: how to remove the top cover without traces, where hidden screws are located, and why you can not use metal tools to slap latches. You will also find tips for troubleshooting and a spare parts compatibility table for Mi. S2.

Preparation for disassembly: tools and security measures

Before starting the disassembly of Xiaomi Mi S2, The robot vacuum cleaner contains fragile plastic parts and electronic components, so it is important to eliminate static electricity and mechanical damage.

Here is the minimum set you will need:

• 🔧 Plastic mediators or shoulder blades (2-3 - to separate the latches of the shell. Metal screwdrivers are not suitable!
• ⚙️ Cross screwdriver PH00 or PH0 — for screws on the bottom panel and inside the housing.
• 📸 Smartphone with camera – to capture the location of parts and wires before disconnection.
• 🧲 Magnetic mat or container – for storing small screws and parts.
• 🧴 Isopropyl alcohol (70%+) Cotton swabs – to clean contacts and sensors.

Also, make sure you have a clean, well-lit space. You'd better cover the table with a soft cloth to avoid scratching the case. If you're disassembling a vacuum cleaner to replace your battery or clean your fan, pre-order the original parts -- fakes may not fit in the connectors or dimensions.

⚠️ Attention: Don't take Mi apart S2 When power is on or if it's in a charging station, even when it's off, the capacitors can keep the charge.

Removal of the upper cover: step-by-step instructions with a photo

The most difficult step is to carefully separate the top of the body from the bottom. S2 It's mounted on 4 hidden latches and 2 screws under rubber plugs, and if you act rudely, you can break the plastic latches or damage the touch buttons.

Follow this algorithm:

1. Turn over the vacuum cleaner and remove the garbage container and water tank (if installed).
2. Remove the rubber plugs on the bottom panel (the screws are hidden underneath). Put a plastic spatula on them.
3. Twisted 2 screws with a cross screwdriver PH00.
4. Insert the mediators in the gap between the top and bottom of the case (start from the side opposite the buttons). Carefully guide the tool around the perimeter, disengaging the latches.
5. Lift the lid at an angle. 30-45° — If you feel resistance, check if all latches are disconnected.

At this stage, there are often problems:

• 🔴 The turn-on button is the most fragile. If it breaks, the lid won't fit tightly.
• 🔴 The power wires of the buttons -- they can't be pulled off! They're connected to the board via a connector.
• 🔴 Collision sensor (front) - with careless removal of the cover can shift.

If the lid doesn't lend itself, don't force it. You probably missed one of the latches. Pay attention to the corners of the case, there are often additional locks hidden there. At the very least, watch the video disassembly for visual comparison.

Access to internal components: what can be cleaned and replaced

After removing the top cover, you will see the interior design of the Mi. S2: So, the battery, the control board, the brush motors and the fan, and it's important not to mix up the connectors and not to damage the plumes:

To clean the fan and the center brush, you just need to remove the bottom panel (4 screws) and remove the accumulated dust with a brush or vacuum cleaner. If you want to change the battery, you have to disconnect the connector from the board and solder the old battery, you need a soldering iron with a thin sting and solder.

⚠️ Note: When replacing the battery, use only original or certified counterparts with the same capacity and voltage. S5 or Mi S6) They will not fit in the connector and may cause overheating.

If your goal is to repair a laser sensor (Lidar error does not respond in the application), first try to clean the lens with a cotton swab dipped in isopropyl alcohol. In 80% of cases, this solves the problem. If the sensor is physically damaged (cracks, chips), it will be expensive to replace it - it is cheaper to buy a used vacuum cleaner.

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Before assembly, apply a thin layer of silicone lubricant to the bearings of the central brush - this will prolong its service life and reduce noise.

Replacement of side and central brushes: nuances and errors

Brushes in Xiaomi Mi S2 — Expendables that require replacement every time 6-12 The side brushes wear out faster due to friction on the boards and furniture, and the central brush is clogged with hair and threads.

For side brush replacement:

1. Turn the vacuum cleaner over and find the brush lockers (they are located on the sides).
2. Press the latch and pull the brush over yourself.
3. Install a new brush before clicking (make sure it rotates freely).

The central brush changes more difficult:

1. Remove the bottom panel (4 screws) PH00).
2. Disconnect the motor connector of the brush from the board.
3. Unscrew 2 screws that hold the brush fastening.
4. Remove the brush and clean the shaft of the coiled hair (use tweezers).
5. Install a new brush and assemble in reverse order.

Frequent errors in replacement:

• 🔴 Incomplete removal of hair from the shaft - leads to a jamming of a new brush.
• 🔴 Mixed connectors – if you connect the brush motor to the wrong connector, the vacuum cleaner will not suck up garbage.
• 🔴 Use of unoriginal brushes – they may not fit the length or stiffness of the bristles.

Cleaning Fan and Filters: Why It Matters

The fan (turbine) is the heart of the vacuum cleaner. Over time, it gets clogged with fine dust, which leads to a decrease in suction power and overheating of the engine. S2 access to the fan opens after removing the bottom panel and disconnecting the duct.

Step-by-step cleaning:

1. Remove the bottom cover (4 screws).
2. Turn off the fan connector from the board.
3. Unscrew the 2 screws holding the turbine.
4. Carefully remove the fan and clean its blades with a brush or compressed air.
5. Wash it. HEPA-filter under running water (if it is reusable) or replace it with a new one.

Signs that the fan requires cleaning:

• 🔊 The vacuum cleaner began to work louder (whistling, grinding).
• 💨 The suction force has decreased (garbage remains on the floor).
• 🔥 The body is warming stronger than usual.
• 📉 In the Mi Home application, a system clogging error appears.

⚠️ Warning: Do not use metal objects or sharp tools to clean the fan, which can damage the blades and disrupt the balance. If the turbine is deformed, it will have to be replaced.

After cleaning, check the air duct tightness. If there are gaps between the turbine and the housing, the vacuum cleaner will lose power. Make sure all rubber gaskets are in place.

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Regular cleaning of the fan (once in a week) 3-6 months) extends the life of the vacuum cleaner and maintains maximum suction power.

Disassembly of the laser sensor (LDS): whenever necessary

laser sensor LDS (Laser Distance Sensor is a key element of Mi navigation S2. It scans the room, builds a map, and calculates the cleaning route, and if the sensor is contaminated or damaged, the vacuum cleaner starts to move randomly, skip zones, or emit a Lidar error.

To get to LDS-module:

1. Remove the top cover (as described above).
2. Unscrew 3 screws that hold the plastic protection of the sensor.
3. Carefully raise the protection - underneath it is a rotating head of lidar.
4. Clean the sensor lens with a cotton swab soaked in isopropyl alcohol.

If the problem remains after cleaning, the following malfunctions are possible:

• 🔴 The motor of rotation is damaged - the sensor does not spin or creaks.
• 🔴 Trail break - check the connection to the main board.
• 🔴 Firmware failure – requires flashing through Mi Home.

Replacement LDS-It's possible to use a module at home, but it's not economically feasible -- the original sensor costs up to 70 percent of the price of a new vacuum cleaner. S2 Refresh your car to a new model (e.g. Xiaomi) S7).

Cleaning the vacuum cleaner: how to avoid mistakes

Assembling Xiaomi Mi S2 After disassembly requires the same care as disassembly. The main rule is to check each connector and mount. One unconnected wire can cause the vacuum cleaner to fail or malfunction.

Assembly order:

1. Make sure all plumes and connectors are connected to the board (especially sensors and motors).
2. Set the battery (if you have removed it) and connect it to the connector.
3. Install a fan, a central brush and side brushes in place.
4. Close the bottom panel and spin 4 screws.
5. Carefully connect the upper and lower parts of the body, starting from the side of the buttons.
6. Tighten 2 screws under rubber plugs.

After assembly, perform the test:

• 🔋 Connect the vacuum cleaner to the charger and check if the indicator is on.
• 📱 Connect to it via the Mi Home app and check the statuses of sensors.
• 🧹 Start a test cleaning in a small area.

⚠️ Warning: If the vacuum cleaner makes unusual sounds (creaking, knocking) after assembly, immediately turn it off and check if the garbage has fallen into the moving parts or if the central brush is skewed.

If something goes wrong, don't panic. Go back to the photos you took before you disassembled, and compare the location of the parts. 90 percent of the time, the problem is an unconnected connector or an improperly installed brush.

Frequent questions about the Xiaomi Mi disassembly S2