Modern wireless headphones, such as the Xiaomi Mi Noise Cancelling Earphones, are complex engineering designs where every millimeter of internal space is occupied by electronics. The need to disassemble them can arise for various reasons: battery failure, damage to the charging cable or simply a desire to clean the insides of earwax and dust accumulated over the years. It is important to understand that opening the device almost always means the loss of official warranty, so weigh all the risks before starting the procedure.
The process of dismantling these headphones requires not only accuracy, but also a specific set of tools, since the manufacturer does not provide easy access to internal components for the user. Unlike full-size models, intrachannel designs are sealed and assembled using a large amount of glue. In this article, we will discuss in detail the stages of opening, typical problems and ways to solve them so that you can return a second life to your favorite gadget.
It's worth noting that the modifications can vary depending on the year of release and the region, so the location of the plumes and screws can vary. We will focus on the classic model with active noise cancellation, which is the most common model on the market. The key is to carefully disconnect the plume of the control button, because its break will lead to complete failure of the device.
Tools and workplace preparation required
Before you start physically affecting the case, you need to organize the right workspace. You will need a well-lit desk, preferably with a white surface, so as not to lose small screws and parts. The absence of dust in the air is also critical, since open electronics are sensitive to contamination. Static electricity can damage the chips, so it is recommended to use an antistatic bracelet or periodically touch a ground metal object.
The toolkit should be specialized. Conventional household screwdrivers can lick the screw hats, which Xiaomi headphones often have a non-standard shape. To work with adhesive joints, you will need a heat source, but its temperature must be strictly controlled so as not to melt the plastic elements of the case or damage the battery.
- 🔧 Precision screwdrivers (cross-hatched) P2/P3, flat, torx T2/T3)
- 🔥 Hair dryer or heating pad for softening glue (temperature up to 80)°C)
- 🎹 Plastic mediators and shoulder blades for opening the body
- 📎 Thin tweezers with curved ends for working with plumes
- 🧪 Isopropyl alcohol and liquid for dissolving glue (B-7000)
Pay special attention to the choice of heating element. Use of open fire or too powerful building hair dryer is unacceptable, as this will lead to deformation of the plastic. The optimal solution is a normal hair dryer with the ability to adjust the temperature or a special heat pad. Before starting work, make sure that the headphones are completely discharged, which minimizes the risks of short circuit in case of accidental damage to the power chain.
☑️ Preparation for disassembly
Xiaomi Mi Noise Cancelling Earphones
Understanding the internal structure of the device greatly simplifies the repair process. Xiaomi Mi Noise Cancelling Earphones are built on a modular principle, where the main components are placed in an ergonomic case of the neck type or in the bowls themselves, depending on the specific modification. Inside, there is a lithium polymer battery, a control board with a Bluetooth module, speakers and microphones of the noise reduction system.
The body design typically consists of two main halves, held together by hidden screws and adhesive layer around the perimeter. The plumes connect the dynamic head to the main board, passing through narrow channels. Any careless movement can damage these thin conductors, which are virtually impossible to repair at home without a microscope and a soldering station.
It is important to consider the location of active noise cancellation elements. Microphones that detect external noise are often displayed on the outside of the case and protected by mesh, and when disassembling, you must be extremely careful not to damage the microphone membranes or disrupt their calibration, which will lead to malfunctioning of the ANC system.
Difficulty repairing speakers
Step-by-step instructions for opening the body
We start by heating the junction line of the cases. Put the warm air on the seam between the halves of the headphones, evenly warming the perimeter for 2-3 minutes. The plastic should become warm to the touch, but not hot. Then insert a thin plastic blade into the gap and carefully, swaying movements, start opening the case as you move around in a circle.
Once the body is partially open, you'll see the internal structure. Don't try to spread the halves wide right away -- there may be plumes or wires connecting the controls. Take a close look at the insides in good light. Often the screws are hidden under decorative stickers or rubber plugs that need to be removed before further disassembly.
The next step is to disconnect the plumes. Use tweezers or plastic spatulas to gently lift the connector up. Connector latches are very fragile, and the force must be applied strictly perpendicular to the plane of the board. If the connector has a lock, it must be bent before the plume is removed.
⚠️ Warning: Never pull the plume unless it's disconnected, this is guaranteed to cause it to break, make sure the connector is free first, and then continue disassembling.
Once all the joints are separated, the halves of the body can be completely separated, the main components are now open, the battery is usually located in the widest part of the structure and can be glued to double-sided tape, and to extract it, you will need to apply heating again and carefully apply the element with a plastic card.
Replacement of battery and batteries
The most common reason for repairs is battery degradation. Over time, the capacity of a lithium polymer battery drops and the headphones stop holding the charge. To replace, you need to know the exact dimensions and voltage of the native cell. Usually Xiaomi uses batteries with a voltage of 3.7V or 3.8V.
The replacement process begins with a gentle uncoupling of the old cell, slap the edge of the battery with a plastic blade, and slowly move it away from the body, remove the glue residue with alcohol, and the new battery should be installed on two-way tape, which ensures reliable fixation and heat sink.
When soldering the contacts of the new battery (unless it comes with a ready-made connector), observe polarity. Mixing the plus and minus will instantly disable the power controller. Use low-temperature solder and fast soldering to avoid overheating the battery itself.
| Parameter | Original | Analogue | Criticism |
|---|---|---|---|
| Tension. | 3.7B - 3.85B | 3.7B | Tall. |
| Typical size | Individual | It fits in size. | Medium |
| Jack | Specific | Requires rations. | Tall. |
| Thickness | 3-4 mm | No more than the original. | Critical |
Once you have a new battery installed, put the headphones back together, but don't seal the case completely, plug the device into charging, check the indication and work, and if everything is working correctly, you can start the final assembly and sealing.
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Use a multimeter to check the voltage on the contacts of the new battery before installation. 3.6-4.2V.
Repair of plumes and dynamic system
Sound problems are often associated with a shattering of the plume connecting the speaker and the board. Visual examination under the magnifying glass will help identify microcracks or oxidation of contacts. If the plume is intact but there is no sound, the problem may be in the speaker itself, which could hoarse or fail due to moisture.
To replace the speaker, you need to unseal its contacts from the board or disconnect the connector. The new speaker must have identical resistance (impedance), usually 16 or 32 ohms. Installation of a speaker with a different resistance can lead to an amplifier overload or quiet sound.
Pay special attention to sealing the acoustic chamber. The speaker should fit tightly to the body, without gaps. To do this, use a thin layer of silicone sealant or special sealing rings. Breaching the tightness will lead to loss of bass and deterioration of sound quality.
If the plume of the control button is damaged, replacing it requires high soldering accuracy. Thin tracks on the plume are easily damaged by a soldering iron. In such cases, it is better to use soldering paste and hair dryer, or consult professionals if you do not have experience with microscopic soldering.
⚠️ Warning: When soldering near plastic elements, use a heat sink (clamp) on the wire so that heat does not pass to the body and does not melt it.
Assembly and seal check
The final step is to assemble the device. Before gluing the halves of the body, make sure that all the plumes are packed into their channels and not clamped. Use a thin layer of special electronics glue (such as the B-7000) along the perimeter of the junction. Avoid getting glue inside the button mechanism or connectors.
Connect the halves of the body and tightly press them together. Lock the structure with rubber bands or clips for the time the glue drys out (usually 2-4 hours), after drying, remove the excess glue and wipe the body with an alcohol napkin.
Check tightness and functionality is mandatory. Turn on the headphones, check the pairing with the smartphone, the operation of the buttons and microphone. Pay special attention to the noise reduction test - when the ANC is on, you can hear the characteristic background that disappears when the function is turned off.
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High-quality sealing of the body after repair is the key to a long service of headphones and protection of electronics from moisture and dust.