How to disassemble the Xiaomi Mi fitness bracelet: full instruction

Wearable electronics owners often face the need to access the device’s internal components. The Xiaomi Mi fitness bracelet may need to be dismantled to replace a failed battery or if moisture enters the case. Despite its compact size, these gadgets have a complex design that requires careful handling.

The main difficulty is that the Xiaomi Mi Band was originally designed as a monolithic device. The manufacturers do not expect the user to open the case himself. However, with the necessary tools and knowledge, it is possible to perform the dismantling without critical damage.

In this article, we will discuss in detail the process of removing the tracker from the silicone strap and its subsequent opening. You will learn about the specifics of working with lithium polymer batteries and the intricacies of sealing. Safety when working with electronics is a prerequisite for successful repairs.

Preparation of the workplace and tools

Before any manipulations, you need to organize a comfortable and well-lit space, small parts are easy to lose, so the surface of the table should be clean and flat. It is recommended to use an antistatic mat to prevent damage to the electronics by a static charge.

The Mi Band will require a specific set of tools, and standard screwdrivers will not work here because of the miniature size of the screws and the lack of them in the design, the main tool will be a thin metal or plastic scalpel.

• 🛠️ Thin knife or scalpel for cutting glue.
• 🔧 Plastic blades (spoogers) for opening the body.
• 🌡️ Hair dryer or heating platform for softening the adhesive.
• 🧲 Magnetic mat for sorting microscopic elements.

Pay special attention to lighting. Microscopic plumes and connectors are hard to distinguish in dim light. If you have a magnifying glass or a microscope, use them to control the process, and this will help avoid the smallest conductors accidentally rupturing.

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Use tweezers with curved ends - it is more convenient to tweak the elements in narrow grooves of the body, without scratching the plastic.

Removing the tracker from the silicone strap

The first stage of disassembling any Xiaomi Mi Band is to remove the main module from the silin clamping. In the first generations (Mi Band 1, 2, 3), the capsule was simply removed by the effort of the fingers. However, in newer models such as the Mi Band 4, 5, 6, 7, the design has changed.

Now the tracker is tightly glued or locked with hidden latches, and to remove it, you have to flip the bracelet down, and on the back of the capsule, closer to one of the edges, you can see a small technological hole or seam, and that's where you have to insert a thin object.

⚠️ Attention: Don't put too much effort into trying to squeeze out the module. Silicone can break, and the plastic body of the tracker can crack. Act gradually, warming the joint with a hairdryer to the point where the tracker is located. 60-70 degree.

The extraction process takes patience. Warming up makes the glue plastic, allowing the module to be carefully separated. If you feel strong resistance, then the glue has not yet warmed up enough. After successful extraction, examine the edges of the capsule for chips.

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Heating the adhesive to 60-70°C is a critical step, without which removing the module from the Mi Band 4-7 strap is almost impossible without damage.

Opening of the body and removal of the back cover

Once the module is removed, the most difficult part is opening the sealed body. Most Xiaomi fitness bracelets are designed without screw joints. The two halves of the body are glued together with a special moisture-proof compound.

First, you need to apply the heat again. Put the tracker down on the heating element with the screen, or carefully warm the perimeter of the seam with a hair dryer. 3-5 see to keep it from overheating OLED-display or battery, the heating time is about 2-3 minute.

Then take a thin blade and insert it into a barely noticeable gap between the front and back panels, and the movements should be cutting, but not deep. Your goal is to cut through the glue layer, not to puncture the insides. Slowly drive the blade around the perimeter of the device.

When the glue is cut, you can lift the lid. If it doesn't, don't pull it hard -- maybe the glue is still in the corners. Repeat the heating and cutting procedure. The sealability of the device depends on the quality of the step.

Dismantling of battery and major components

Inside the case, you'll see the main board and the battery taking up most of the volume. The lithium polymer battery in the Xiaomi Mi Band is usually glued to the body or held by a tight fit. You need to unplug it with extreme care.

First, disconnect the battery plume from the motherboard, use a plastic blade or dielectric-coated tweezers, and metal tools can short circuit if other contacts on the board are affected.

• 🔋 Carefully pull the battery connector from the bottom up.
• 🧩 Disconnect the display plume if a complete dismantling is required.
• 🧹 Clean the insides of old glue with alcohol.
• 🔍 Check the fee for oxides or corrosion.

Removing the battery itself often requires smacking it down with a thin tool. Be careful: damage to the battery shell can cause fire or bloating. If the battery is swelling, you need to work with extreme caution, avoiding punctures.

⚠️ Warning: Never break through or heat a damaged battery above 50 degrees. Dispose of bloated batteries at special reception points.

If your goal is to replace a vibrator or pulse sensor, the procedure is similar. These cells are usually soldered on the board or connected through miniature connectors. In Mi Band 7 and later, the battery can be integrated into a single assembly with the board, making replacing individual cells economically impractical.

Features of working with the display and plumes

The screen in Xiaomi fitness bracelets is the most fragile element, attached to the frame or directly to the body through a layer of glue. When disassembling the Mi Band, there is often a risk of damaging the matrix or tearing off the plume.

The plumes in these devices are extremely thin. Any careless movement of tweezers can lead to microcracks that will manifest later as stripes on the screen or complete extinction. When disconnected, hold the plume behind the thickened connector, not the flexible part itself.

If you are planning to replace the display, make sure the new component is compatible with your version of the board.Even within the same model (e.g. Mi Band 5), there may be different screen revisions from different vendors.Incompatibility can cause the touchscreen to fail.

When you reverse assemble, it's important to put the plume in the right way, it should lie in the designated channel without cracks, often a small piece of tape or glue is used to fix the plume, and don't ignore this detail, because the vibration of the motor can eventually disconnect a poorly secured contact.

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Before you take off the old screen, take a picture of the location of all the plumes and connectors, which will help you not to confuse anything during the assembly.

Assembly and restoration of leakage

The final step is to build the device and restore its moisture protection, and simply inserting the module back is not enough, since the Xiaomi Mi Band lost its factory seal on opening.

Best used is a B-7000 or T-7000 glue that remains elastic after drying, allowing the device to withstand temperature expansions and vibrations, and apply the adhesive in a thin, continuous line around the perimeter of the seat.

Connect the halves of the body and tightly press them against each other. Excess glue, protruding out, you need to immediately remove a dry wipe before they are frozen. To fully polymerize the adhesive, the device is recommended to leave under the press (for example, under a stack of books) for 12-24 hours.

• 🧴 Disgust the surface with alcohol before gluing.
• 💧 Apply a thin layer of glue B-7000 contour.
• 🤲 Close the details tightly and remove the excess.
• ⏳ Leave to dry under the load for a day.

Once dry, check all the functions: touchscreen, vibrator, sensors and Bluetooth connections. If everything works correctly, you can put the module back in the strap. Now your gadget is ready for use again.

⚠️ Warning: Even after high-quality gluing, the device no longer has a factory rating IP68. It is not recommended to immerse the restored bracelet in water or take a shower with it.

Frequently Asked Questions (FAQ)