Disassembly of the case of wireless headphones Xiaomi: instructions with photos and tips

Why to disassemble the case from Xiaomi headphones and when it is necessary

Xiaomi’s wireless headphone charging case is not just a case, but a full-fledged device with a battery, charging controller and contacts. Over time, even the most reliable models (Mi AirDots Pro 2, Redmi Buds 3, Haylou) GT1) You can have problems, like failure to charge, a bloated battery, or contamination of contacts:

✔️ Diagnose faults – check the integrity of the board, contacts and plumes.

✔️ Clean oxidized elements - restore efficiency after moisture enters.

✔️ Replace the battery – if the case stopped holding the charge or swelled.

✔️ Restore the mechanism of the cover – if it closes poorly or jams.

But disassembling a case is always a risk, because the manufacturer doesn't provide easy access to the insides: the case is glued together, and the board is often fixed to double-sided tape, more than 60 percent of the breakdowns after self-disassembly are due to damage to the battery plume or separation of contact areas, if you are not sure about your skills, you better contact the service center.

In this article, we will take a closer look at the disassembly process using popular models, explain tools and common errors, and give tips on reverse assembly.

Preparation: Tools and precautions

Before you start disassembling, make sure you have everything you need, and without the right tools, you risk damaging the body or the internals, and here's the minimum set:

• 🔧 Plastic mediators or shoulder blades - for careful separation of glued parts (metal screwdrivers scratch plastic!).
• 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
• 🔋 Multimeter – to check the battery voltage (normal: 3.7–4.2V).
• 🧴 Isopropyl alcohol (90%+) — Cleaning contacts and removing glue residues.
• 📦 Container for screws – to avoid losing small parts (some models have hidden screws under stickers).

⚠️ Warning: If the case battery is swollen, don't heat it with a hair dryer! Risk of fire or explosion. In this case, immediately remove the battery in the open air without piercing it.

Also prepare the workplace:

• 📸 Take a picture of the case from all sides before disassembly - this will help with the reverse assembly.
• 🪑 Work on a table with good lighting, preferably with an antistatic mat.
• 🧲 Keep a magnet on hand – some screws in Xiaomi cases are tiny and easily lost.

Disconnected the case from charging (at least 1 hour)|Prepared all the tools.|Photographed the body and location of the stickers|Wearing an antistatic bracelet (optional)|Checked the battery won't blow.-->

Step-by-step disassembly of the case: from the cover to the fee

Xiaomi case design is usually the same: two halves of the case glued together, inside – the board with the controller, the battery and contact springs. Consider the process with the example of Mi AirDots Pro 2 (simi like Redmi Buds 3 and Haylou). GT1).

Step 1: Removal of the upper cover

Start with the most fragile part, the lid mechanism, and most models have it mounted on two miniature hinges and are fixed by latches.

1. Carefully put the mediator angle of the cover on the side of the loop (usually there is a small gap).
2. Keep the tool smoothly along the seam until the lid is broken. Don't force it, the plastic is fragile!
3. If the cover does not lend itself, slightly heat the seam with a hairdryer (no more than 10 seconds).

⚠️ Warning: In magnetic-lock models (such as the Xiaomi Buds 4 Pro), there may be a tiny magnet inside the lid!

Step 2: Separation of the body

The case case case is glued around the perimeter to separate the halves.

1. Place the mediator in the gap between the top and bottom (start from the side). USB-C plug).
2. Carefully circle the tool, gradually increasing the gap. If the glue does not lend itself, heat the body with a hair dryer (60-70).°C).
3. As soon as a gap of 1-2 mm appears, insert a second mediator into it and continue to disconnect.

In some models (for example, Redmi Buds 3 Lite) there may be hidden latches inside, and if the case does not separate, check if there are any additional mounts under the stickers.

Step 3: Removing the board and battery

After the separation of the body, you will see:

• 🔋 Battery – usually glued to the lower half.
• 📱 Board with controller - fixed screws or double-sided tape.
• 🔌 Contact springs - for charging headphones.

Algorithm of action:

1. Unscrew all screws (usually 2-4, under the cross screwdriver). PH00).
2. Carefully disconnect the battery plume from the board (use a plastic spatula!).
3. If the battery is glued, put it under the mediator, preheated with a hair dryer (maximum 80).°C).

⚠️ Attention: Don't pull the battery plume - it's often soldered to the board with thin wires. = case-case!

Scheme of the internal structure of the case

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If you find oxidized contacts after disassembly, clean them with a cotton swab dipped in isopropyl alcohol. To restore conduction, you can use a special spray contact (for example, Kontakt 60).

Typical Problems and How to Resolve Them

Once you've taken a look at the case, you might encounter a few common malfunctions, and let's look at the causes and the repairs.

1.The case is not charged from USB

If the indicator does not burn when connecting to charging, the problem may be:

• 🔌 USB-C connector – check the integrity of soldered contacts (often break off when the cable is sharply removed).
• 📉 Charging controller – if the connector is intact but the current is not going, the chip may have burned (requires a replacement board).
• 🔋 Battery: Measure the voltage with a multimeter. 2.5V, The battery is deeply discharged and may not take charge.

🔧 Solution: If the connector is a problem, re-drink it or replace the board entirely. You can use a lithium booster to restore the battery).

2.The case doesn't charge the headphones

Are the headphones undetectable or charging too slowly?

• 🔗 Contact springs -- they have to be clean and resilient. Oxidation or pollution disrupts the connection.
• 📶 The plume between the board and the contacts – if it has departed or damaged, the current does not go to the headphones.
• 🔄 Case firmware is rare, but it happens that the controller "forgets" headphones (helps reset via holding the button).

🔧 Solution: Clean the contacts with alcohol, check the integrity of the plume. If the springs are bent, straighten them carefully with tweezers.

3. Bloated battery

If the battery is swelling, it needs to be replaced, and even if the case is still working, the risk of fire is too high.

1. Disconnect the battery plume from the board.
2. Remove the battery by heating the glue with a hair dryer (do not pierce!).
3. Replace it with the same size and capacity (usually) 3.7V 300–500mAh).
4. Stick the new battery onto double-sided tape or heat glue.

⚠️ Warning: Never use superglue or epoxy to fix the battery! when heated, they can damage the case or the battery itself.

4.The lid is closing badly.

If the case cover is dangling or not fixed, the problem may be:

• 🔧 Loop - over time it shatters or breaks.
• 🧲 Magnet – if it falls out or demagnetizes, the cover will not hold.
• 🔄 Latches – plastic fixtures can break if opened carelessly.

🔧 Solution: If the loop is broken, it can be replaced by a donor from another case!).

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Most of the problems with Xiaomi cases are battery or contacts. Before changing the board, check these items - they are cheaper and easier to repair.

How to properly collect the case back

Assembly is as much a process as disassembly. If you don't connect the parts correctly, the case may fail or quickly break again.

1. Check all connections: The battery plume should be tightly connected to the board. Contact springs should not touch the body (risk of short circuit). The screws are twisted to the point, but without excessive effort (you can tear the thread!).
2. Close the case: Combine the halves of the case, starting from the side USB-C Press the body around the perimeter to make it snap. If the gaps are too big, use glue. B-7000 (thin-layer!).

Set the lid:

• Insert the hinges of the cover into the grooves of the body.
• Close the cover and make sure it is fixed by a magnet.

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After assembly, wipe the contacts of the case and headphones with alcohol - this will improve the connection and eliminate possible charging problems.

Where to buy spare parts for repair

If you need replacement parts (battery, board, cover), they can be found in the following places:

🔍 Selection advice:

• 🛒 Before buying a battery, check its size and capacity (should match the original).
• 🔧 If you buy a fee, check if it comes with a soldered connector. USB-C.
• 📦 On AliExpress, look for sellers with a rating above 98% and reviews about compatibility with your model.

⚠️ Warning: Be careful with "universal" boards - they may not fit on connectors or firmware.

When repairs are not feasible: alternative solutions

Sometimes it costs more to repair a case than to buy a new one. Consider the best cases to refuse to restore:

• 💥 The board burned down – if the controller shows blackened elements or burned tracks, the replacement will cost 70-80% of the cost of a new case.
• 🔥 The battery swelled and damaged the case - the plastic could deform, and the tightness after repair will not be restored.
• 🔧 Contact springs and connector broken USB-C — Replacing both elements requires soldering work and is often not justified.
• ⏳ Case older than 3-4 years – new models are cheaper and more reliable (for example, Xiaomi Buds 4 with fast charging).

💡 Alternatives:

• 🔄 Buy a used case on Avito or Yula - often sold for 300-800 ₽.
• 🔋 Use Powerbank with Powerbank USB-C to charge headphones directly (if they support this function).
• 🛒 Buy a new case - prices start at 1000 ₽ (For example, Redmi Buds 3 Lite).

If you're going to make a repair, you should consider the cost-benefit ratio, like replacing your battery for 300. ₽ Recovery is required for 1500 repairs ₽ — Most of the time, no.

FAQ: Frequent questions about the disassembly of Xiaomi cases

If there is a voltage, but the case does not turn on - the problem is in the board or plume.