Why Xiaomi smartphone connects only one headphone: a full analysis of the problem

You took out Xiaomi AirDots or Redmi Buds, turned on Bluetooth on your smartphone, but the sound is only in one headphone? The problem is familiar to many owners of wireless headsets of the brand. 80 percent of the time it is not the fault, but the software failure or the wrong settings. But how to distinguish the software bug from the hardware defect and return stereo sound without contacting the service?

In this article, we’ll look at all the possible reasons Xiaomi can only see one headphone, from a simple battery discharge to damage to contacts in a case, you’ll get step-by-step diagnostic instructions, checklists and a model compatibility table, and if the problem turns out to be hardware-related, you’ll learn how to save on repairs.

Let us warn you right away: if the headphone has never worked in a pair (for example, after buying only one), this is almost guaranteed marriage - immediately contact the seller under warranty.

1. Checking the underlying causes: battery, distance, interference

Start with the obvious. 35 percent of the time, the problem is solved without deep tuning, and you just need to eliminate the external factors.

• 🔋 Headphones and case charge. Even if the indicator is green, the battery could be discharged unevenly. Check the charge level of each headphone in the Mi Home or Xiaomi Wear app (Devices section» → model).
• 📶 Distance to smartphone: Xiaomi wireless headphones work at a steady range of up to 10 meters in line of sight. Walls, furniture, or even your body (if the phone is in your pocket on the opposite side) can block the signal.
• 🚫 Misconduct sources: Microwaves, 2.4GHz Wi-Fi routers, other Bluetooth devices (fitness bracelets, speakers) are causing interference. Try to turn them off or move to another room.

If the headphones are unevenly discharged, place them in the case for 15-20 minutes, then remove and try to reconnect. For AirDots Pro 2 and later models, use fast charging: 5 minutes in the case gives up to 1 hour of operation.

⚠️ Attention: If one earphone discharges 2-3 times faster than another, this may indicate battery wear or short circuit.

2. Reset Bluetooth connection: step-by-step instruction

A common cause of the problem is a failure of sync between headphones or between headphones and a smartphone, in which case a complete reset helps. The instructions are suitable for all Xiaomi models (including Redmi Buds and Mi True Wireless):

1. Open the settings → Bluetooth on your smartphone.
2. Find your headset in the list of associated devices and click on the gear (⚙️) near-name.
3. Select “Forget the device” (or “Disable the pairing”).
4. Return the headphones to the case, close the lid for 10 seconds, then remove them.
5. Press the button on the case (or touchpad on headphones) for 15-20 seconds until the indicator starts flashing red and white (reset mode).
6. Connect the headphones again through Settings → Bluetooth → Add the device.

For models that support Mi AI Assistant (such as Xiaomi Buds 4) after reset, you may need to reset the voice assistant.

If after reset the problem remained, go to the next section – perhaps the fault of the firmware headphones or smartphone.

3. Firmware Update: Why It Matters

Outdated firmware is one of the main reasons Xiaomi may not see the second headphone.The manufacturer regularly releases updates to fix synchronization bugs. For example, in Redmi Buds 3 Pro, firmware version 1.4.0.6 fixed the problem with the loss of the right earphone when calling.

To update the headphones:

1. Install the Xiaomi Wear app (for Android) or Mi Home (for iOS).
2. Connect the headphones to your smartphone.
3. Open the app, go to the section of your headset.
4. Press three points (⋮) in the upper right corner and select “Firmware Update».
5. Follow the instructions on the screen. Don't turn off the headphones during the process!

The update takes 3-7 minutes. When it's done, the headphones will automatically restart. If the update doesn't show up, check:

• 📱 Compatibility of headphone model and application version (see table below).
• 🌐 Internet connection (update downloaded from Xiaomi servers).
• 🔄 Try restarting your smartphone before updating.

⚠️ Note: If the headphones are interrupted during the firmware update, they may stop turning on, in which case only a forced reset via the service menu will help (see Section 5).

4. Case problems: contacts, magnets, charging

A case is not just a case, it's a charging station and a headphone sync, and if the contacts are contaminated or the magnets are demagnetized, one of the headphones may not charge or sync with the pair.

• 🔍 Visual inspection. Light the contacts in the case and on the headphones. If you see oxidation (green plaque) or contamination, clean them with a cotton swab dipped in alcohol.
• 🧲 Magnet check. Put the earpiece in the case, it has to pull in with a click, and if the magnet is weak, the earpiece won't connect properly to charge.
• ⚡ Charging test. Place the headphones in the case for 1 minute, then check the charge level of each in the application. If one doesn't charge, the problem is in the contacts or the power controller.

For models with wireless charging (Xiaomi Buds 3T and later), check out:

• The location of the case on the charging pad (should lie in the center).
• No metal objects nearby (they create interference).

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If the case doesn't charge the headphones, try connecting it to another cable or power source, and sometimes the problem is with the power supply, not the case itself.

If the problem persists after cleaning the contacts, the charging controller in the case may not be working, in which case only repair or replacement will help.

5. Hardware malfunctions: how to diagnose

If none of the previous methods worked, it's probably a hardware problem, and here are the most common breakdowns and their signs:

For diagnosis:

1. Try connecting a non-working headphone to another device (tablet, laptop), and if it's not identified, it's the problem.
2. Listen to the sound through the earphone in mono mode (if supported). To do this, in Xiaomi Wear, select Sound Mode → Mono.
3. Check the response to touch commands. If the earphone does not respond, the board may break.

If the diagnostics confirmed a hardware breakdown, evaluate the feasibility of repair. For example, replacing the speaker in Redmi Buds 3 costs 800-1200 rubles, which is comparable to the cost of new headphones.

6. Problems with the smartphone: settings, firmware, conflicts

Sometimes the problem isn't with the headphones, but with the Xiaomi smartphone, and this is what can get in the way of a proper work:

• 📲 An outdated version MIUI. In the firmware older MIUI 12.5 were bugs with Bluetooth 5.2 support, because of which the headphones were connected only in mono mode.
• 🔊 Sound profile conflict: If your smartphone activates "For the hard of hearing" or "mono-audio", one earphone may turn off.
• 🚫 Power saving limitations: Battery optimization can turn off the Bluetooth module for one of the headphones.

To avoid problems with the smartphone:

1. Update MIUI to the latest version via Settings → About Phone → System Update.
2. Turn off mono-audio mode: Settings → Special. features → Sound → Mono-audio.
3. Add the Xiaomi Wear app to battery optimization exceptions: Settings → Battery → Battery Optimization → All applications.
4. Reset network settings: Settings → SIM-maps and mobile networks → Resetting network settings.

If you have Xiaomi with a Snapdragon processor (like the Redmi Note 11), check the Bluetooth codec settings. LDAC. Switch to the switch. SBC or AAC In Settings → Bluetooth → Sound settings (⚙️).

7. Alternative ways of connecting

If standard pairing doesn't work, try alternative methods of connectivity, which help in 20% of cases where the headphones are determined by the system, but the sound is only one.

Method 1: Manually connect each headphone

1. Turn off both headphones in Bluetooth settings.
2. Only take the right earpiece (usually the main one) out of the case.
3. Connect it to your smartphone (should flash white).
4. After successful connection, remove the left earphone – it should automatically join.

Method 2: Using the Developer Mode

For advanced users:

1. Activate Developer Mode: Settings → About Phone → MIUI version (click 7 times).
2. Back to Settings → Additionally. → For developers.
3. Find the Bluetooth Debugging Settings option and turn it on.
4. Reboot your smartphone and try to reconnect the headphones.

Method 3: Connecting through a third-party application

If Xiaomi’s native software doesn’t work, try:

• Bluetooth Auto Connect (automatically reconnects devices)
• SoundAssistant (allows you to manually select a sound profile).

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If the headphones connect through a third-party app but not through the standard Bluetooth menu, the problem lies in the firmware of the smartphone or the conflict of services.

8.When to contact the service: signs of serious breakdowns

If you've tried all of these, but the second headphone still doesn't work, it's time to consider a professional diagnosis, and here are the signs that self-repair is not possible or feasible:

• 🔥 The headphone warms up when working or charging.
• 💧 On the board or inside the housing, traces of oxidation or moisture are visible.
• 🔊 There is a sound, but with strong distortions (cracking, squeaking).
• 📉 The headphone discharges in 10-15 minutes of work.
• 🚨 The headphone is not defined by any device (including PC).

The cost of repairs in official Xiaomi services (as of May 2026):

• Dynamic replacement: 800–1500 ₽.
• Battery replacement: 1000–1800 ₽.
• Repair of the board (contact soldering): 1200-2500 ₽.
• Replacement of Bluetooth module: 1500–3000 ₽ (model).

Before the service visit:

1. Reset your headphones (see section 2).
2. Take a picture of your checks or warranty card (if any).
3. Check if the warranty period (usually 12 months) has expired.

⚠️ Note: Some service centers refuse to repair headphones purchased from unofficial stores (for example, on AliExpress.

FAQ: Frequent questions