How to disassemble Xiaomi Redmi wireless headphones: step-by-step repair

Owners of popular audio equipment often face the need to look inside the device, whether to replace a dead battery, clean the speakers from earwax or fix problems with charging. Disassembling Xiaomi Redmi wireless headphones is a challenge, as the manufacturer uses hidden fastener technology and adhesive connections to provide moisture protection and aesthetic appearance. However, with the right entry points and with the right tool, you can successfully diagnose and restore the device to work without going to the service center.

Before you start dismantling, you need to understand the risks. The internal layout of these devices is extremely dense, and lithium-polymer batteries are sensitive to mechanical damage. Any careless movement can lead to a puncture of the battery or the break of the thinnest plumes. However, for enthusiasts and those whose devices are already out of warranty, this process opens up opportunities to extend the life of your favorite equipment.

In this article, we will take a detailed look at the process of disassembling different models, paying special attention to the nuances of working with plastic latches and adhesive layers. You will learn what tools are necessary to safely open the case and how not to damage the fragile membranes of speakers when collected back.

⚠️ Warning: Self-opening of the case automatically cancels the manufacturer's warranty obligations.

Tools and workplace preparation required

The way electronics are repaired starts with a workspace, and you need a perfectly lit desk, preferably with a light coating, so you don't lose any screws or parts, and the main tool is a set of precision screwdrivers, which includes PH00 and PH000 cross bits, and flat slits to tamper with plastic, without which you can't access the insides.

The adhesives that Xiaomi is actively using require a hair dryer or thermostole to warm the body perimeter, and the plastic must be warm but not melt, and plastic mediators, suction cups to carefully pull parts off, and tweezers with curved ends to manipulate plumes and fine contacts will also be indispensable.

• 🛠️ A set of precision screwdrivers (cross, flat, Torx)
• 🔥 Hair dryer for heat treatment of adhesive layers
• 🎸 Plastic blades and mediators
• 🧲 Magnetic screw-sorting mat
• 🔋 Multimeter for voltage testing

Special attention should be paid to cleanliness. There are no active fans inside the headphones, but dust can settle on the contacts. Before starting work, it is recommended to wipe the tools with alcohol and wash your hands so that greasy marks do not remain on the boards. This is a basic requirement for any repair engineer.

⚠️ Note: The use of metal blades to open the body is strictly prohibited - they can damage the power supply or close contacts on the board.

Design features of Redmi Buds models

The Redmi Buds lineup, including versions 3, 4 and Lite, has its own design features. Unlike older Mi True Wireless models, it often uses a combined mount: screws are hidden under silicone mounts or decorative stubs, and the rest of the perimeter is held on glue. Understanding the architecture of a particular model is the key to success.

For example, in the Redmi Buds 3 Pro, the main screw often hides under the logo on the outside of the bowl. In simpler versions, such as the Redmi Buds 3 Lite, a system of internal latches around the perimeter can be used, requiring careful passage by the mediator. It is important not to make excessive efforts not to break plastic springs or guides.

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Before heating the case with a hairdryer, remove the headphones from the charging case - heating can damage the contacts of the case or melt its plastic.

The interior is usually three-layered: an outer plastic shell, a middle speaker frame, and an inner board with a battery. Between the layers are often sealing rubber gaskets to protect against moisture. When disassembling them, they must be removed extremely carefully, because when reassembled they can break, which will reduce the tightness of the device.

Step-by-step instructions: disassembling the headphone

The dismantling process begins with the removal of all removable elements. Remove the silicone embushure and filter mesh if it is removable. Carefully inspect the inside of the bowl in bright light: look for screws. If there are no screws under the plugs, then the body is assembled on glue and internal latches. Heat the perimeter of the earpiece with a hairdryer to a temperature of about 60-70 degrees for 1-2 minutes.

Using a thin plastic blade, start gently walking along the junction of the halves of the body. Move slowly, inserting the blade to a depth of no more than 2-3 millimeters. You will hear the characteristic click of snapping latches. If the body does not lend itself, do not press harder — add a little more heat. Sharp movements can split the plastic.

Once the perimeter is past, don't open the halves abruptly. Inside, there are almost always thin wires connecting the main board to the battery or control button. Examine the insides through the resulting slit. If you see wires, tweez the board gently and disconnect the battery connector from the board before finally splitting the case.

• 🔍 Visually inspect the board for oxides or unstuck elements
• 🔌 Check the density of the plume speaker landing
• 🧹 Clean the speaker mesh with a soft brush from contamination
• 🔋 Measure the voltage on the contacts of the battery with a multimeter

Diagnostics and battery replacement

The most common cause of disassembly is battery failure. If the headphone stopped holding the charge or does not turn on at all, most likely, the Li-Po cell is exhausted. In Redmi models, batteries are often glued to a plastic bed or sealed into the case.

If the battery is glued, apply a little alcohol or a special adhesive solvent under it, wait a few minutes and gently tuck it with a plastic blade. Never use metal objects to slap the battery — this can cause a short circuit or fire. The new battery should have the same dimensions and voltage (usually 3.7V) as the original.

When you install a new battery, make sure that the polarity is met. A mixed plus and minus can instantly disable the charge controller on the board. Once connected, check the voltage on the circuit board contacts - it should appear immediately after the connection. If the earphone does not respond, check the soldering of the contacts.

Repair of the charging case

Disassembly of the Xiaomi Redmi charging case is often required if the indicator has stopped burning or the headphones do not charge inside. Cases usually consist of two main parts: the upper cover with a loop and the lower base. They are connected, usually by screws hidden under a rubber leg at the bottom or under the logo.

First, remove the rubber plug at the bottom, which may be hiding PH00 screws underneath, unscrew them, gently walk the mediator through the seam between the top and bottom, and inside you find the main board with the charge controller and the case battery, and often the problem lies in the oxidation of contacts in the headphone recesses or in the outgoing plume of the indicator.

Clean the contacts with alcohol using a cotton swab. If the problem is in the case battery, it usually has a standard connector and is glued to double-sided tape. It is easier to replace it than in the headphones themselves, because the space inside the case is more spacious. Make sure that the new element has overdischarge protection.

• 🔌 Check integrity USB/MicroUSB charger
• 🧹 Clean the headphone grooves from dust and pile
• 💡 Check the operation of the LED indicator
• 🔩 Make sure the reliability of the board attachment to the body

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A common failure of the case is the oxidation of charging contacts within the recesses, and regular cleaning with alcohol prolongs the life of the device.

Assembly and seal check

Reverse assembly is a process that requires as much precision as disassembly. Before connecting the halves of the body, make sure that all the plumes are stacked in their grooves and not clamped. The battery wires must lie loose, without putting pressure on the lid. If you damage the adhesive layer on opening, use a thin layer of special B-7000 glue or double-sided electronicscotch.

Apply a thin strip of glue around the perimeter, avoiding the speakers and microphones. Put the halves of the body together and press them tightly together. Lock the device with rubber harnesses or clips for 15-20 minutes until the glue is completely dry. Extra glue, carefully remove with a dry wipe.

Once assembled, check the health: connect the headphones to the phone, check the sound in both channels, the microphone and the sensors. If everything is working correctly, then the repair was successful. Remember to wipe the case with microfibre to remove fingerprints.

⚠️ Warning: Do not turn on the headphones immediately after gluing if you used liquid glue - solvent vapors can damage the speaker membrane.