How to disassemble Xiaomi Mi Band 2: detailed instructions with photos and tips

The 2016 Xiaomi Mi Band 2 fitness bracelet is still popular with users for its simplicity, reliability and low price, but over time, even such a device may require repairs: a discharged battery, a damaged display or departed contacts make owners think about disassembling. Unlike the new latch models, the Mi Band 2 is sealed, which complicates the process but does not make it impossible.

This article will help you to disassemble the bracelet without damage if you are faced with one of the typical problems:

• 🔋 The battery is discharged in a few hours or does not hold the charge
• 📱 The display stopped responding to touches or shows artifacts
• 💧 The water was stained inside (despite the claim). IP67)
• 🔌 The bracelet is not charged or is defined as an unknown device.

Before you start, consider that disassembly will void the warranty (if it is still valid), and the wrong actions can permanently disable the device. If you are not sure of your skills, you should contact the service center.

In this instruction, we will consider:

• 🛠️ Necessary tools and their analogues
• 📸 Step-by-step process of disassembling with photos
• ⚡ Common Mistakes and How to Avoid Them
• 🔧 Tips for reverse assembly and performance check

Training: tools and materials

You don't need expensive professional tools to disassemble the Mi Band 2, but you don't need a minimum set, and the main challenge is a sealed body that's glued around the perimeter.

• 🔪 Plastic mediator (or guitar) - for gently putting the lid on. Metal blades can leave scratches.
• 🔥 A hair dryer or a thermo-air station to soften the glue, even a household hair dryer at maximum power will do.
• 🧲 Magnetic screwdriver (cross-cross-haired, PH00) — for spinning four screws inside.
• 🧴 Isopropyl alcohol (90%+) — Removing glue residues and cleaning contacts.
• 📦 Plastic container - so as not to lose small parts (screws, gaskets).
• 🔋 New battery (optional) - if the purpose of disassembly is to replace the battery. 3.7V 70mAh plug-in JST 1.0.

If you don't have a mediator on hand, you can use a plastic card (bank or discount), but it is less flexible and can break. Even hot water will do to heat the glue (plug the bracelet into boiling water for 1-2 minutes), but this is risky for electronics - moisture can penetrate into the interior.

⚠️ Warning: Do not use a knife or screwdriver to lid the lid! metal easily cuts through plastic, leaving noticeable marks, and can damage the display plume.

2. Step-by-step disassembly of the hull

The disassembly process can be divided into three stages: lid separation, board retrieval, and battery/display access, starting with the hardest part: opening the sealed case.

Step 1: Heating the glue layer

Place the bracelet on a flat surface with the display up. Turn the hair dryer on at maximum temperature (or set the thermoair station at 80-100).°C) and warm the body evenly around the perimeter for 2-3 minutes. The glue will become softer, and the lid will separate more easily.

If there is no hair dryer, use an alternative method:

1. Put the bracelet in a plastic bag and tie it.
2. Lower the bag in hot water (60-70)°C by 5 minutes.
3. Take it out and immediately start disassembling - the glue will harden quickly.

Step 2: Separation of the cover

Insert the mediator into the gap between the top and bottom of the case (begin at the corner next to the button). Carefully drive the tool along the perimeter, gradually increasing the gap. If the lid does not respond, warm it up again.

The key point is, don't try to pull the lid off abruptly. There's a plume inside the display that can be damaged. Once the slit is wide enough, you can pull the lid on the opposite side and remove it.

Heated the body around the perimeter.|The mediator is inserted into the gap at an angle of 15-20°|No sudden movements - only smooth passage along the circuit|The display plume is not stretched-->

Step 3: Unscrewing screws and retrieving boards

Under the lid, you'll see:

• 🔋 Battery (stick to the body)
• 📱 Printed circuit board with chip and vibration motor
• 🔌 Four screws (two for the battery, two for the board)

Carefully unscrew the screws with a cross screwdriver and put them in a container. Then unplug the display plume (which is attached to the board) and remove the board. Be careful - the battery contacts are not isolated, accidental circuit can cause the bracelet to fail.

⚠️ Warning: If you notice corrosion on the board or green plaque is a sign of moisture intake, in this case, be sure to clean the contacts with alcohol before assembly and dry the bracelet for at least 24 hours.

Replacement of the battery: nuances and risks

The most common reason for disassembling the Mi Band 2 is a worn-out battery, with an average lifespan of 2-3 years, after which the capacity drops to 30-50% of the original. A new battery costs 200-400. ₽ (depending on the seller, and the replacement in the service will cost 800-1500 ₽.

To change the battery:

1. Unplug the old battery from the case. It's glued to double-sided tape -- put it in a mediator.
2. Unplug the wires from the board (if the new battery is without a connector) or just disconnect the connector. JST 1.0.
3. Stick the new battery onto the same scotch or use heat-glue.
4. Connect the connector to the board, observing the polarity (red wire - plus).

If you're not sure about your soldering skills, you'd better buy a battery with a soldered connector already, because the risk of damage to the board is minimal. The average capacity of a new battery is 70-80 mAh, which is the same as the original.

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Before soldering new wires wrap them with a thin shrink tube - this will protect against short circuit during assembly.

Disassembly of display and buttons

If the problem is a broken display or a sticky button, a deeper disassembly is required.The display in the Mi Band 2 is a slick one. OLED-A touch panel connected to the board by a flexible plume, and the button is a separate module with a micro-switch.

To get to them:

1. Remove the fee (as described earlier).
2. Carefully disconnect the display plume from the circuit board connector, and it's fixed by the latch -- lift it up with a flat screwdriver.
3. To replace the button, unscrew the two screws holding its module and remove it.

Typical malfunctions:

• 📵 Display not turned on - check the plume for breaks, clear contacts.
• 🔄 Artifacts on the screen - a sign of damage OLED-matrices (replacement required).
• 🔘 The button is not pressed - it may have been hit by dirt or broken spring.

⚠️ Warning: Display plume is extremely brittle! Don't bend it at an angle of more than 90° If the contacts are oxidized, clean them with a pencil eraser (it is softer than sandpaper).

5. Cleaning and preparation for assembly

Before you reassemble, make sure to clean all parts of the glue, dust and oxidation residues, which will prolong the life of the device and prevent reassembly.

• 🧴 Isopropyl alcohol - for cleaning contacts and board.
• 🧼 Cotton sticks - to remove glue from the grooves of the body.
• 🌬️ Compressor or cylinder with compressed air - for blowing dust from hard-to-reach places.

Pay particular attention to:

• Battery contacts – they should be clean and shiny.
• The connector of the display plume - oxidation here leads to "glitches" of the screen.
• Vibrational motor – if it is clogged with dust, the vibration will be weak.

If the bracelet has been in contact with water, dry it for at least a day in rice or silica gel. Do not use a hair dryer to dry the board - hot air can damage the components.

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Even if the bracelet works after disassembly, check its leakproofness before using in the rain or in the pool.

6. Reverse assembly and performance check

The Mi Band 2 is built in reverse order, but with some nuances:

1. Make sure that the display plume is correctly inserted into the connector and fixed with a latch.
2. Check the polarity of the battery before connecting.
3. Twisting all screws, but don't pull over - plastic can crack.
4. Apply a thin layer of sealant (for example, LOCTITE 577) around the perimeter of the water-recovery cover.

After assembly:

• 🔌 Connect the bracelet to charge. If it doesn't turn on, check the battery contacts.
• 📱 Sync with the Mi Fit app. If the bracelet is not determined, reset it to factory settings (press the button for 10 seconds).
• 💧 Check the tightness by lowering the bracelet in water for a few minutes (without sudden movements).

If there are problems after assembly:

• 🔋 No charge – check the integrity of the contacts on the board and cable.
• 📵 Not included – possibly poor battery contact or damaged board.
• 🔄 Spontaneous reboots are a sign of poor contact of the display plume.

7. Alternatives to repair: when disassembly is impractical

Sometimes repairing the Mi Band 2 is more expensive than buying a new bracelet.

If you decide to buy a new bracelet, pay attention to the following models:

• 🆕 Xiaomi Mi Band 3/4 — similar design, but with a touch button and improved display.
• 💪 Xiaomi Mi Band 5/6 — more (SpO₂, stress test, but the price is higher.
• 💰 Redmi Band – a budget alternative with similar characteristics.

Check compatibility with your smartphone before buying – some new models require MIUI 12+ Android 8.0+.

Frequently asked questions