Why Xiaomi headphones only charge one headphone: a full analysis of the problem

You put Xiaomi headphones in your case, and an hour later you find that only the left or right one is charged? 3/4 Pro and others TWS-The most common faults are contact issues, synchronization failures, or hardware defects, but before you bring the device into service, you have to figure it out yourself. 80% In some cases, the problem can be solved by 10 minute.

In this article, we're not going to spray on general tips like "reset your headphones," instead, on specific reasons with step-by-step instructions, a model compatibility chart, and proven repair methods, and if you've tried your best, at the end, there's a checklist for diagnosis before you go to the service center.

1. Contamination of contacts in the case or on headphones

The most common cause is oxidation or clogging of charging contacts, dust, sweat, cosmetics (such as tone cream), and even ordinary dirt from pockets can block the transmission of current, especially open-contact models: Redmi AirDots 2, Mi True Wireless Earbuds Basic 2.

How to check:

• 🔍 Look at gold/copper contacts on headphones and in a case in good light. Look for dark spots, green plaque (oxidation) or visible dirt particles.
• 📱 Use a magnifier or smartphone camera in macro mode to view microcracks.
• 🧲 Check the magnetic mount: if the headphone is not fixed well in the socket, the contacts may not touch.

How to clean:

1. Take a cotton swab dipped in isopropyl alcohol (90%+) or regular vodka. Gently wipe the contacts without pressing.
2. For persistent contaminants, use an eraser (washing gum) - it will remove oxides without risking damaging the coating.
3. Blow the contacts with dry air (dryer at minimum power or a can of compressed air).

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Do not use metal objects (needles, knives) to clean – they scratch the contacts and impair conduction.

Case malfunction: broken connector or charging controller

If the contacts are clean, but the problem remains, the charging case itself may be to blame. In cheap models (Redmi AirDots S, Mi Basic) often fails the power controller or Type-C connector.

• 🔌 The case is not charged from the cable (the indicator does not burn).
• 🔋 The battery of the case discharges in a few hours without using.
• 🎧 One earphone is charged, the other is not, regardless of the position in the case.

Diagnosis:

1. Connect the case to another cable and power supply (preferably the original on 5V/1A).
2. Check if the charging indicator on the case is lit when connecting to the network.
3. Try charging headphones from another case (if possible).

Decisions:

• 🛠️ Type-C connector repair: often oxidized or out of contact, you can gently solder them yourself or take them to the service.
• 🔄 Replacement of the controller: Xiaomi models often use a chip SY6970 or IP5306. Replacement cost - from 500 rubles.
• 🆕 Buying a new case: for popular models (for example, AirDots 3 Pro) cases are sold separately for 1,000-1 500 rubles.

3. failure of synchronization between headphones

Xiaomi headphones work on Bluetooth Low Energy (BLE) protocol, and sometimes there is a pair gap between the left and right module, as a result, one earphone can charge, and the other does not, since the case does not see it as part of the headset.

Signs of a problem:

• 🎵 One headphone connects to the phone, the other does not.
• 🔋 The Mi Home mobile app only displays one headphone.
• 🔄 After extracting from the case, the headphones are not synchronized automatically.

How to fix it:

Remove the headset from the list of Bluetooth devices on your phone|Put both headphones in the case and close the lid.|Press and hold the button on the case for 15-20 seconds (until the indicator flashes)|Connect your headphones again via Mi Home or Bluetooth settings-->

If the reset didn't work, try flashing the headphones through the official software.

1. Download the Mi Earphones Updater utility from the official Xiaomi forum.
2. Connect the case to the PC via Type-C cable.
3. Follow the instructions of the program (usually you need to press the button on the case 3 times).

Yeah, I had to rebuild a couple.|No, we've always been stable.|I don't know, I haven't.|Other-->

4 Hardware defects of the headphone: battery or board

If none of the previous methods worked, the problem may lie in the headphone itself:

• 🔋 Bloated battery – blocks contacts or damages board.
• 🔌 Folded contact on the headphone board (often after falls).
• 💥 Short circuit due to moisture intrusion.

Diagnosis:

For the Xiaomi Buds 3/4 Pro models with active noise cancellation (ANC), the additional risk is overheating of the chip due to constant microphones. If the headphone stopped charging after prolonged use with the ANC, let it cool for 1-2 hours, then try again.

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If the earphone falls into water or is exposed to extreme humidity, do not try to charge it - this can lead to a short circuit.

5. Problems with firmware or software

Rarely, but there are software failures, because of which the case “can not see” one of the headphones. This is true for models with support for updates through Mi Home: Xiaomi Buds 3 Pro, FlipBuds Pro, AirDots 3.

Signs:

• 📱 The app displays a notice "Update firmware".
• 🔄 Headphones are constantly rebooted when connected.
• 🎵 The sound gets distorted, there's interference.

How to update firmware:

1. Install the latest version of Mi Home from Google Play or App Store.
2. Connect the headphones to the application (in the Devices section → Add).
3. If you have an update, you'll see an Update button. Don't turn off your headphones during the process!

For models without Mi Home support (for example, Redmi AirDots S), the firmware updates automatically when you connect to a Xiaomi smartphone. If the failure occurred after the update, try rolling back the firmware via PC (instructions are available on the 4PDA or XDA-Developers forums).

6.Incompatibility with fast charging

Some Xiaomi models (especially budget ones) do not support fast charging from powerful adapters (Quick Charge, Power Delivery).If you use an 18W+ power supply, the case may misallocate current, leaving one earphone without charging.

Recommendations:

• ⚡ Use the original adapter on the 5V/1A (comes complete).
• 🔌 Connect the case to USB 2.0 port of PC or laptop - there is a stable voltage 5V.
• 📱 Avoid wireless charging – they often cause crashes in budget models.

Critical information: Xiaomi Buds 3T and AirDots 3 models have a hidden limitation on the charging current - if you exceed 1.2A, the controller turns off power to one of the headphones to protect the battery.

Mechanical damage: falls, impacts, moisture

Even after an apparently successful "resuscitation" drying, Xiaomi headphones can have hidden damage:

• 💧 Corrosion on the board after moisture is ingested.
• 🔨 Microcracks on tracks after impact.
• 🧲 Demagnetizing contacts in the case.

What to do:

1. If the headphones fall into the water, take them apart (carefully!) and check the board for white plaque (corrosion).
2. After falling, examine the speaker mount - if it has moved away, the sound will be distorted, and charging can be blocked.
3. Check the Bluetooth antenna loop (thin wiring around the body) and when the earphone breaks, it won't sync and charge.

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To check the tightness of the headphones after repair, use a vacuum test: close the earphone tightly with your palm and try to draw in air. If you feel resistance, the body is sealed.

Checklist before contacting the service

If you have tried everything, but the problem remains, go through this list, so as not to waste time in the service:

Check charging from another cable and power supply|Clean the contacts with alcohol and eraser|Drop your headphones through a button on the case|Update the firmware through Mi Home|Try charging your headphones in another case (if possible)|Check if the battery is inflated.-->

If none of the items helped, the problem is likely to be:

• 🔋 Faulty headphone battery (replacement) ~1,000 rubles.).
• 🔌 Damaged Charging Control Board (Repair) ~1 500 rubles.).
• 💻 Microprogram failure (flashing) ~500 rubles.).

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In service centers Xiaomi headphone repair is cheaper than third-party masters, but you will have to wait 7-14 days. TWS-headset.

FAQ: Frequent questions