How to fix wireless headphones Xiaomi: step-by-step instructions

The sudden shutdown of your favorite audio equipment often takes you by surprise, especially when it comes to popular models like Mi True Wireless Earbuds or Redmi Buds. Users are faced with one of the headphones stop charging, the sound becomes quiet or the device simply does not turn on. Instead of carrying the gadget to the service center and waiting for weeks, you can try to restore the performance yourself with a minimum set of tools.

Repairs TWS-The problem with headphones is that they require precision because the interior space is so limited, and the challenge is that they don't provide easy access to the battery or the speaker, using adhesives instead of screws. However, knowing the right sequence of actions and precautions, you can prolong the life of your device.

In this article, we will take a look at typical malfunctions, diagnostics, and the step-by-step process of disassembling popular models. You will learn how to replace a lithium-polymer battery, clean sound channels, and reset software errors that often mimic hardware failures. A critical step is to carefully unplug the outer cover without damaging the button plume if it passes close to the edge of the case.

Diagnostics of major malfunctions

Before you start disassembling, you need to clearly define the nature of the breakage. Often the problem is not the hardware, but the software failure or contamination of contacts. If the Xiaomi Earbuds stop working, the first thing you do is check the status of the charge case. This is the power source for the headphones, and if its battery is dead or contacts are oxidized, the headset will not charge.

The second common cause is a software glitch where the right and left headphones stop syncing with each other, in which case the sound can only come from one channel, or the devices are not visible in the Bluetooth list. To rule out this, try to reset completely by placing the buttons on the case or the headphones themselves according to the instructions for your model.

If software methods didn't work, pay attention to physical symptoms. Extraneous noise, cracking or lack of bass can indicate damage to the speaker or moisture. In the case when the indicator on the case does not light up when you install headphones, most likely the problem is in the contact patches or deep discharge of the battery.

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Before diagnosis, always wipe the golden contacts on headphones and inside the case with a dry cotton swab dipped in isopropyl alcohol. Oxidation is a common cause of a "dead" device.

Tools and workplace preparation required

You can't do a good job without the right tools, because the cordless headphones are so tightly assembled, you'll need a set of thin tools, and don't try to pick up plastic with a knife or needle, because you're at risk of damaging the internal components or leaving deep scratches on the glossy surface.

You will need thin plastic blades (mediators), a suction cup to gently lift the covers, tweezers with curved ends and a thin cross screwdriver. Also remember to prepare a source of glue (B-7000 or T-7000) for reverse assembly, as factory latches often break at the first opening.

Organize the workspace so that small screws and parts are not lost. It is recommended to use a magnetic mat or container with cells. When working with lithium batteries, be careful: do not pierce them or heat them above 60 degrees to avoid fire.

Battery disassembly and replacement process

The most common reason headphones stop holding charge is battery degradation. To replace it, you need to open the body. Heat the outside of the headphone with a hairdryer to about 80-90 degrees to soften the glue. Then gently tuck the lid with a mediator and slowly lead around the perimeter, trying not to damage the internal plumes.

Once the lid is removed, you'll see the main board and the battery. Carefully disconnect the battery connector from the board using a plastic blade. The old battery is usually glued to double-sided tape; it needs to be carefully tweaked and removed. The new battery must have exactly the same dimensions and voltage (usually 3.7V) to fit into the compartment.

⚠️ Warning: Never solder a new battery directly with a soldering iron with its body. High temperatures will damage the internal chemistry of the cell. Use spot welding or solder wires to the contacts already installed on the battery, keeping polarity in mind.

Install a new element, plug the connector and check the performance without sealing the case completely. If the indicator catches fire and the earpiece is turned on, apply a thin layer of glue B-7000 around the perimeter of the cover and press it tightly for 10-15 minutes. Remove the excess glue with a dry wipe until completely dry.

Resolving problems with sound and speakers

If one of the headphones sounds quieter than the other or wheezes, the problem is often contamination of the speaker's mesh with earwax and dust. Over time, this plaque hardens and blocks sound waves. To clean, remove the silinic hood and gently clean the mesh with a soft toothbrush soaked in alcohol.

In more complex cases, when cleaning does not help, it may be necessary to replace the dynamic emitter itself.Dynamics in Xiaomi Mi AirDots and similar models are often standard sizes (for example, 6 mm or 8 mm), but may differ in height and location of contacts.When ordering a new spare part, be sure to measure the diameter and height of the old speaker with a rod.

To replace the speaker, you need to unseal the old wires from the board and solder the new ones with polarity. After you change, check the sound. If the wheezing is gone but the sound is too quiet, maybe it's the software's volume limiters or the membrane's damage when you install it.

Repair of the charging case

A charger case is a complex device with its own control board, battery and charge controller. If the case does not charge the headphones, but it is charged by the mains, the problem may be contacts inside the sockets, they may have oxidized or gone inside the case due to a breakage of the spring mechanism.

The disassembly of a case usually begins with the removal of a rubber leg at the bottom or the careful opening of the seam between the halves of the case. Inside you will find a battery of 18650 format or a flat Li-Po element. If the case stopped holding the charge, replacing this element will solve the problem.

There is often a problem with a charging connector (Micro-USB or Type-C) that slacks and falls off the board. Repair requires the skills of soldering hot air or a thin sting. If you are not confident in your abilities, it is better to replace the entire case control board by buying a donor case.

Assembly of the device and checking leakage

The final stage of the repair is assembly. Make sure that all the plumes are packed into their channels and not clamped with the body. When gluing parts of the body, apply a thin strip of glue, avoiding hitting speakers and microphones. Squeeze the parts hard and lock them with rubber bands or in a clutch with soft sponges for the time the glue drys (usually 2-4 hours).

Once assembled, check the touch zones if you have them in your model. In some cases, after disassembly, you need to recalibrate the sensors, which is performed through a special application Mi Home or Xiaomi Earbuds. Also check the sound quality at different frequencies.

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The quality of the glue directly affects the moisture protection and bass response. A poorly glued lid can rattle at low frequencies, creating a malfunctioning effect.

⚠️ Warning: Do not use superglue (cyanacrylate) to assemble electronics casings. It becomes brittle over time, leaves white plaques and can damage plastic when repaired. Use only specialized adhesives for electronics.

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