What to do if only one Xiaomi headphone works: a complete guide to diagnosis and repair

You pulled out your favorite Xiaomi wireless headphones (whether it's Redmi Airdots, Mi True Wireless Earphones or Buds 4 Pro), turned on the music - and suddenly found that the sound comes from only one headphone? TWS-The causes can be trivial (contamination of the speaker) or serious (breakdown of the Bluetooth module). In this article, we will examine all possible causes and give step-by-step instructions for restoring stereo sound, from simple actions to deep diagnostics.

It's important to understand that if the earphone doesn't turn on completely (the indicator doesn't blink, the phone doesn't detect it), that's one problem. If it plugs in but doesn't play sound, that's another. We'll look at both scenarios, and you'll also know when you can save the device yourself, and when it's time to bring it to the service center.

1. Checking basic settings: why a phone can "ignore" the headphone

Before disassembling or carrying your headphones for repair, make sure that the problem is not in your smartphone settings. Often, the system automatically switches the sound to one channel due to a malfunction or incorrect settings.

Let's start with the simplest one:

• 📱 Reboot your smartphone. Sometimes a bug in the Bluetooth stack is solved by a simple reboot. MIUI older than 12th version.
• 🔊 Check the sound balance. In the sound settings (Settings) → Sound. → The stereo balance could have been a slider that would have gone off, and if it was shifted left or right, it would only come from one earpiece.
• 🎧 Turn off monosound. Some firmware (like the Redmi Note 10 Pro) has a "monosound" option for people with hearing impairments, which duplicates the sound in both earbuds, but sometimes malfunctions.

If you’re using a Xiaomi or Redmi smartphone, go to Settings → Connected Devices → Bluetooth Settings and find your headphones. Make sure:

• 🔹 The "Sound" tab is not limited (e.g., "Left ear only").
• 🔹 Profile included A2DP (If it's off, it's mono.

2.Brushing headphones: how dirt and moisture kill sound

One of the most common reasons for not having sound in one earphone is contamination of the speaker or contacts. Dust, earwax, sweat or moisture can block the speaker's membrane or disrupt the connection between the headphones.

To clean Xiaomi headphones correctly:

1. Use a soft brush (for example, to paint or clean lenses) to remove dust from the speaker grille. Don't press - the membrane is thin!
2. Cotton swabs moistened with alcohol (70%) will help remove fatty deposits. Never drip alcohol directly on the earpiece - only on the stick!
3. Blow the headphone with compressed air (for example, a canister for the keyboard) – this will remove dust from hard-to-reach places.

Pay special attention to the contact areas on the headphone case (if the model supports charging in the case), oxidation or dirt on them can cause one earphone to not sync with the other.

After cleaning, try reconnecting the headphones. If the sound doesn't appear, move on to the next step.

3.Reset and reconnect Xiaomi headphones

If one earphone is plugged in, but it's not playing sound, or it's not being detected at all by the phone, there's probably a synchronization failure between the headphones, and a full reset will help.

Instructions for most Xiaomi/Redmi models:

For models without a button on the case (for example, Mi True Wireless Earphones 2S):

1. Get both earphones out of the case.
2. Press the touchpads on both headphones for 10-15 seconds until the indicators start flashing red and white.
3. Return the headphones to the case, close the lid for 5 seconds, then reconnect.

If one headphone still doesn’t work after reset, the problem may be a firmware or hardware breakdown.

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Before reset, check the charge of the case and headphones. If the battery is discharged below 20%, the reset may not work.

4. Problems with firmware and updates

Xiaomi headphones have their own software that sometimes crashes. If one headphone stopped working after an update or just "gone out," try:

Update the firmware through the official appendix:

• 📱 Install Mi Earphones (for Redmi Airdots) or Xiaomi Earbuds (for Buds) 3/4 Pro from Google Play or AppGallery.
• 🔄 Connect the headphones and check for updates in the "Firmware" section".
• ⚠️ Don’t interrupt the update process – it can “brick” headphones!

If the update doesn’t help or the app doesn’t see one of the headphones, try rolling back the firmware (if there’s a backup) or resetting to factory settings through the app.

Some models (like the Redmi Airdots 3 Pro) have alternative firmware from enthusiasts that solve sound problems, but installing them requires skill and can be insecure.

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If the headphones stopped working after updating the firmware, try rolling it back through the official software. 60% of the time, this solves the problem.

5. Diagnostics of hardware breakdowns

If none of the software methods worked, it's probably a hardware problem. Here are the most common hardware breakdowns of Xiaomi headphones:

For self-diagnosis:

1. Try connecting your headphones to another device (tablet, laptop), and if the problem persists, it's the headphones.
2. Look at the charge indicators. If one earphone is discharged much faster than the other, the battery is the problem.
3. Shake the earphone. If you hear any foreign noise (such as rattling), you may have soldered off the speaker or the capacitor.

⚠️ If you notice that the earphone case is swollen or the smell of burning appears, don't turn it on. It's a sign of a bloated battery that could cause a fire!

6. Repair with your own hands: what can be done at home

If you’re willing to take the risk of trying to fix your headphones yourself, here are some safe methods:

Battery replacement (relevant for models older than 2 years):

• 🔧 Buy a new battery (for example, for Redmi Airdots, a 301230 40 mAh battery will suit).
• 🔥 Carefully open the body with a hair dryer (heat to 80)°C to soften the glue).
• ⚡ Solder off the old battery and solder a new one, observing polarity.

Reconciliation:

• 🧴 If the contacts are oxidized, clean them with a swallow or alcohol.
• 🔌 If the contact is soldered off, carefully solder it back (use a soldering iron for 20-30 watts).

Replacement of speaker:

Speakers for Xiaomi headphones can be found on AliExpress (see model, for example, "Dynamic for Mi True Wireless Earphones 2"). Replacement requires precision - the membrane is easily torn!

⚠️ Attention! When you disassemble Xiaomi headphones, you lose the warranty (if it is still valid), and there is a high risk of damaging the microphone or Bluetooth antenna if you do not have experience soldering.

If you're not sure about your abilities, you should take the headphones to the service.

• 💰 Battery replacement: 800-1500 ₽.
• 💰 Replacement of the speaker - 1000-2000 ₽.
• 💰 Diagnostics + cleaning - 500-1000 ₽.

7.When is the time to buy new headphones

Unfortunately, not all Xiaomi headphones are worth fixing, here are signs that it’s time to consider buying a new model:

• 🕒 Headphones are more than 3 years old and they hold a charge for less than 1-2 hours.
• 🔊 The sound becomes silent or distorted even after cleaning.
• 🔋 The battery is swelling or the headphone spontaneously shuts down.
• 📡 Constant connection problems (earphones are lost, the sound is interrupted).

If you’re considering buying new headphones, look for models with moisture protection (IPX5 and above) and LDAC/aptX support for better sound. Among the current Xiaomi models in 2026:

• 🎧 Xiaomi Buds 4 Pro – flagship with ANC and 9-hour playback.
• 🎧 Redmi Buds 5 – budget version with good autonomy.
• 🎧 Mi True Wireless Earphones 3 – a balanced choice for price / quality.

Check compatibility with your smartphone before buying – some features (like fast connectivity) only work with devices on MIUI.

FAQ: Frequent questions about Xiaomi's broken headphone