Weights analysis Xiaomi Mi Smart Scale: step-by-step guide with photos and expert advice

Xiaomi Mi Smart Scale (and its Mi Body Composition Scale 2 or Xiaomi Smart Scale 2) have become a popular gadget for controlling weight and body composition. However, over time, even such devices have problems: batteries run out, sensors break or a glass panel cracks. Service centers charge from 1,500 rubles for analysis and diagnosis, although many malfunctions can be fixed independently – if you know how to properly disassemble the scales without damaging fragile components.

In this article, you will find a step-by-step photo instruction, a list of necessary tools, and unique tips for disassembling without damaging touch contacts (the main problem in self-repairing), we will also analyze the typical errors that cause the scales to stop turning on after disassembly, and give recommendations for replacing batteries, cleaning sensors and restoring performance.

If you've never done any electronics, practice on old scales or watch video disassembly (links are at the end of this article), but with the right approach, even a beginner can do it in 20 to 30 minutes!

Preparation for disassembly: tools and security measures

Before you start, make sure you have everything you need. Without the right tools, you risk scratching the glass, breaking the latches, or damaging the board.

• 🔧 Plastic mediators or openers (2-3 pieces) - for careful tanning of the body. Metal screwdrivers can leave scratches!
• 🔋 The screwdriver. PH0 or PH00 — The usual screwdriver can rip the slats off.
• 🧲 Magnetic mat or container – so as not to lose small screws and parts.
• 📸 Smartphone for photography – fix the location of parts before disassembling.
• 🧴 Isopropyl alcohol (70%+) Cotton swabs – to clean contacts and sensors.
• 🔋 New batteries CR2032 or AAA (Depending on the model, if you are planning a replacement.

Also prepare your workspace: a clean desk with good lighting, no crumbs or dust. Work on a soft substrate (like a towel) so you don't scratch the glass panel. If you're going through the scales of the Mi Body Composition Scale 2, it has 4 screws under rubber legs - they're easy to miss!

⚠️ Warning: Don't disassemble the scales immediately after use! Give them 10-15 minutes to cool - condensation inside the case can damage electronic components when disassembling.

Step 1: Removing the glass panel is the most important step

The Xiaomi Mi Smart Scale is attached to the body with double-sided tape and plastic latches, and the first mistake of the newcomers is to try to remove it by force, which breaks the latches or cracks the glass.

1. Turn the scales over and remove the rubber legs (under them there may be screws - unscrew them).
2. Insert a plastic mediator into the gap between the glass and the case at one of the corners. Carefully swipe along the edge to separate the bilateral tape.
3. Repeat the procedure on the opposite side. When the tape is gone, raise the glass vertically, don't pull sideways!

If the glass doesn't lend itself, don't apply force. Try to heat the edge of the body with a hair dryer (50-60°C) to soften the scotch. For Mi Body Composition Scale 2 models, you may need to disconnect the sensor plume (more on that below).

Step 2: Unconnecting the plumes and removing the board

Once the glass is removed, you'll see a board with sensors and a battery compartment, and the key here is not to damage the flexible plumes that connect the glass panel to the board. Xiaomi Mi Smart Scale 1 models have two plumes:

• 🔌 Main plume of sensors (wide, goes to glass).
• 🔋 Battery compartment plume (thin, often glued).

To disconnect the plumes:

1. Carefully tuck the latch of the connector with a plastic blade (it is usually black or white).
2. Pull the plume parallel to the board, do not pull up!
3. If the plume is glued, warm it with a hair dryer or drip isopropyl alcohol under the edge.

Once the plumes are disconnected, you can remove the board, which is usually mounted on 2-4 screws (PH0). In Mi Body Composition Scale 2 models, the board can be glued to the body — use the mediator to tamper with it carefully.

Step 3: Replace batteries and clean contacts

The most common cause of malfunction Xiaomi Mi Smart Scale - discharged or oxidized batteries, depending on the model used:

To replace:

1. Remove old batteries (in models with CR2032 they can "stook" - use a plastic spatula).
2. Clean the contacts with a cotton swab soaked in isopropyl alcohol.
3. Install new batteries while observing polarity (the board has a + and - marking).

If the scales are not included after replacing the batteries, check:

• 🔌 Quality of contacts – oxidized or bent contacts may not provide a connection.
• 🔄 Polarity of batteries – even one inverted battery will bring the device down.
• 🔧 Battery compartment closure – some models have a micro-switch that works when the lid is closed.

💡

If the scales show the wrong weight after replacing the batteries, perform a calibration: stand on them and hold for 5 seconds - the device will reset the readings.

Step 4: Diagnostics and repair of sensors

If the scales are turned on but show an incorrect weight or error (e.g., Err or Lo), the problem may be in the sensors. Xiaomi Mi Smart Scale uses strain gauges (they convert mechanical pressure into an electrical signal).

• ⚖️ The indications are "jumping" or are very different from the actual weight.
• 🚫 Error Error Appears When Weighing.
• 🔄 Libras spontaneously reset.

For diagnosis:

1. Look at the sensors on the board -- they look like little black squares with wiring, and they should be free of cracks, oxidation, or detached contacts.
2. Check the soldering of the sensor contacts. If you see microcracks, carefully soak them with a soldering iron (power no more than 30 watts!).
3. Clean the sensors with alcohol – sometimes dust or fat interfere with proper operation.

If the sensor is damaged, it can be replaced. The cost of a new strain gauge for Xiaomi is from 300 to 800 rubles. The main thing is to find an analogue with the same sensitivity (the parameter is indicated on the sensor body).

⚠️ Warning: Don't touch sensors with your bare hands - finger fat can affect the accuracy of measurements.Use gloves or take sensors with tweezers.

Step 5: Building the scales – how to avoid mistakes

Assembling Xiaomi Mi Smart Scale after repair requires no less accuracy than disassembly.

• 🔌 Unconnected plumes – scales will not turn on or show an error.
• 🧲 Disturbed board – can cause sensor damage.
• 🔋 Poorly fixed glass will luft and break latches.

Assembly order:

1. Set the charge in place and spin the screws (do not pull!).
2. Connect the plumes - they should click when installed correctly.
3. Apply a new double-sided tape to the edge of the case (use 0.5-1 mm thick Scotch).
4. Set the glass starting from the side of the plumes and press evenly (do not clap!).
5. Close the battery compartment and check the operation.

After assembly, perform the test:

1. Turn on the scales (click on the glass or install batteries).
2. Stand on them - the readings should stabilize in 2-3 seconds.
3. Check sync with the Mi Fit app (if the scales are connected to the smartphone).

1. The polarity of the batteries.

2. the quality of the contacts of the plumes (sometimes they are not fully inserted).

3. Sensor integrity (possibly damaged during assembly).-->

Frequent problems after disassembly and their solution

Even if you do everything according to the instructions, after the dismantling, there may be problems.

If the scales after repair show the wrong weight, perform the calibration:

1. Stand on the scale and hold for 5-10 seconds.
2. Compare readings with control weights (such as weights).
3. If the difference is more than 0.5 kg, check the sensors or manually calibrate through Mi Fit (in the device settings).

FAQ: Answers to Frequent Questions