Xiaomi Mi Scale 2: Step-by-step guide with photos and tips

Xiaomi Mi Body Composition Scale 2 has become a popular gadget for controlling weight and body composition, but even such devices have problems over time: battery drains, contacts become contaminated or sensors break. Disassembling the scales yourself is not easy because of hidden latches and fragile construction, but with the right approach, it is quite real. In this article, you will find detailed instructions with photos, a list of necessary tools and unique tips that will help to avoid typical mistakes.

It is important to understand that disassembling the Mi Scale 2 scales will void the warranty (if it is still valid), and improper actions can damage the touchpad or electronics. We will tell you how to minimize risks, what tools to use and what to look for when you reassemble. If your goal is to replace the battery, clean contacts or diagnose malfunctions, this guide will help you do everything carefully.

Preparation for disassembly: tools and precautions

Before you start disassembling, make sure you have everything you need. Xiaomi Mi Scale 2 is assembled without visible screws - their body is supported by plastic latches that are easy to break if you carelessly handle.

• 🔧 Plastic mediator (or guitar mediator) – to disconnect the body without scratches.
• 🔨 Thin screwdriver with a flat tip (1-1.5 mm) - for slapping latches.
• 🧲 Magnetic screwdriver or tweezers - so as not to lose small details.
• 📸 Smartphone for photography – capture each step so as not to confuse details during assembly.
• 🧴 Isopropyl alcohol (70%+) Cotton swabs - for cleaning contacts.

Also prepare a clean workspace with good lighting. It is not recommended to disassemble scales on a carpet or soft surface - small details (such as battery contact springs) can easily get lost. Use a white sheet of paper or silicone mat to track all the elements removed.

⚠️ Warning: Don't use metal tools to detach the body - they leave scratches on the glossy surface of the scales. If you don't have a plastic mediator, you can replace it with a credit card or a plastic spatula to repair your phones.

Before disassembling, completely discharge the scales (if they still work) or remove the battery if access is possible without opening, which will prevent short circuits from accidentally touching the contacts. If the scales do not turn on, check if the contacts of the battery compartment have oxidized, which is often the problem.

Step 1: Removal of the upper panel (touch glass)

The most important step is to separate the touchpad from the body. On the Mi Scale 2, it's glued around the perimeter with double-sided tape and fixed with plastic latches. Start by carefully warming up the hairdryer (temperature no higher than 50°C) at the edges of the panel, which will soften the glue and make it easier to detach.

Insert a plastic mediator into the gap between the glass and the body (better start at the corner where the Mi logo is located). Carefully drive the mediator along the edge, gradually disconnecting the panels. Do not apply force — if the glass does not respond, then you missed the latch. In this case, slightly press on the glass from above to weaken the fixation.

• 🔹 Start at the top right corner – there is less risk of damaging the plume of the sensors.
• 🔹 If the glass "crunched", immediately stop disassembling - most likely, the panel cracked.
• 🔹 Do not attempt to separate the glass completely before the plume is disconnected!

When the glass rises 1-2mm, stop and move to the detachment of the plume, which is located at the bottom of the scale and is attached to the board with a latch connector. Carefully tuck the latch with a thin screwdriver and remove the plume. Now the top panel can be completely removed.

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If the glass doesn't separate, try flossing or threading it, slash it in the gap and gently cut it along the edge, cutting the glue, a technique that requires patience but minimizes the risk of damage.

Step 2: Removing the board and battery

When you take the touchpad off, you'll see the main board with the sensors and the battery compartment. The Mi Scale 2 uses a lithium battery called CR2032, which is attached to the plastic holder, to extract it:

1. Carefully tuck the battery with a thin screwdriver on the side (without touching the contacts!).
2. If the battery is "rigged", use plastic tweezers to avoid damaging the body.
3. Check the contacts for oxidation – if they are green or black, they should be cleaned with alcohol.

Now you can take out the main board. It's attached to the body with four screws (usually a PH00 cross screwdriver). Unscrew them and raise the board carefully, don't pull the wires! There are load gauges (4 pieces) underneath that are responsible for measuring weight. They're easy to damage, so don't touch them unnecessarily.

⚠️ WARNING: If you're disassembling a battery replacement scale, don't touch strain gauges with your bare hands - fat marks on their surface can distort readings. Use gloves or charge for edges.

Step 3: Cleaning contacts and diagnosing faults

If the Mi Scale 2 scales are not turned on or show incorrect data, the cause is often oxidized contacts or contamination of sensors.

• 🔋 Battery bay: Clean the contacts with a cotton swab dipped in isopropyl alcohol. If the oxidation is strong, use an eraser for mechanical cleaning.
• 📶 Bluetooth antenna: Check the integrity of the track on the board (it goes from chip to edge.
• ⚖️ Tensometers: Make sure they are not offset and the wires are not clamped. If the sensor is damaged, the scales will show Err or inflated / undervalued values.

To check the board's performance, connect it to an external power supply (3V) through the battery contacts. If the scales are on but not responding to weight, there's a problem with the sensors or connecting them to the board. If they don't, there's a possibility of a microcontroller malfunction or a circuit break.

If you find a damaged track on a board, you can repair it with conductive glue or solder (you'll need a soldering iron with a thin sting), but it takes experience — if you've never soldered, you'd better go to the service.

Step 4: Replace the battery and assemble the scales

To replace the CR2032 battery, use a similar battery (e.g., Duracell DL2032 or Maxell CR2032) and don't buy cheap batteries of unknown brands, which are quickly discharged and can leak.

1. Place the battery in the holder plus up (the board usually has a + marking).
2. Carefully press until the click - the contacts should fit tightly.
3. Before assembly, check the work of the scales, temporarily connecting the board to the glass (without full fixation).

The weights are collected in reverse order:

The hard part is to combine the latches on the top panel, start by fixing the angle with the plume, then gradually snap the rest of the sides by pressing the glass on top. If the case doesn't close tightly, check:

• 🔍 Did the plume fall between the case and the glass.
• 🔍 Has not the fee shifted - it should lie flat, without distortions.
• 🔍 Are there any foreign objects inside (screws, pieces of glue).

⚠️ Warning: Once assembled, the scales may show Err or incorrect weight. This is normal — sensors need time to calibrate. Place the scales on a flat surface and step on them 2-3 times to reset the error.

Common Mistakes and How to Avoid Them

Even with careful disassembly, users often make mistakes that lead to a breakdown in the scales, and here are the most common problems and ways to prevent them:

Another common problem is the skewed circuit board when you build it, and if the screws are twisted unevenly, the load gauges can touch the body, which leads to inaccurate readings, and to avoid that, twist the screws cross-cross (like the wheels of a car), evenly pressing the board.

Critical error: trying to disassemble the scales without removing the battery, which can lead to a short circuit when the screwdriver touches the board contacts. Always turn off the power before repair!

When the Disassembly Will Not Help: Alternative Solutions

Not all Xiaomi Mi Scale 2 problems are solved by disassembly.

• 📱 Not synced with the app – try resetting them through Settings → Devices → Drop in Mi Fit.
• 🔄 Show the wrong weight – perform calibration: stand on the scale and hold the value of 10 seconds.
• 🔋 Quickly discharge – check if they remain on in the background (turn off notifications in Mi Fit).

If after dismantling the scales stopped working, and you are not confident in their abilities, it is better to contact the service center. Official repair Xiaomi will cost 1500-3000 rubles (depending on the malfunction), but guarantees performance. Alternatively, buying a used board on AliExpress (about 1000 rubles), but this is risky due to possible incompatibility.

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If the scales don't turn on after you change the battery, check the fuse on the board (a small black element next to the battery contacts) that could burn if you short-circuit.

FAQ: Frequent questions about the Xiaomi Mi Scale 2 disassembly