Xiaomi Redmi left-hand headphone does not work: full diagnosis and repair

You took out your Xiaomi Redmi wireless headphones, turned on your favorite track, and suddenly you found that the left earphone was not making a sound or was working with interruptions. The problem is familiar to many owners of Redmi Airdots, Buds 3/4, AirDots Pro and even the new Redmi Buds 5. In 70% of cases, the malfunction can be fixed by yourself without contacting the service center. But first you need to determine whether it is a software failure (for example, after updating the firmware), or hardware failure (damage of the speaker or contacts).

In this article, we will look at all the possible reasons for the silence of the left earphone in Xiaomi Redmi, from the banal (discharged battery) to the complex (breaking flexible plume). You will learn how to diagnose without special tools, what settings to check in your smartphone, and when it really is time to carry the headphones for repair. And for those who like numbers, according to statistics from service centers, 45% of cases are to blame for a contaminated charging connector, 30% – a failure of synchronization between the headphones, and only 25% – physical failure of the speaker or board.

1. Checking the underlying causes: power and connection

Before you disassemble your headphones or reset your settings, eliminate obvious issues that are often overlooked. Start with the charger case: even if the indicator on it is on, it does not guarantee that the left earphone is really charged. Redmi Airdots S and Buds 3 Lite models often experience uneven charging — one earphone gets current and the second does not due to oxidized contacts.

Here's what to do:

• 🔋 Check the charge level of each headphone separately through the Mi Home or Xiaomi Earbuds app (Battery Status tab).If the left one shows 0%, the problem is in the case or contacts.
• 🔌 Clean the contacts on your earpiece and in your case with a cotton swab dipped in alcohol.
• 📱 Reconnect the headphones to your phone: remove them from the list of Bluetooth devices, then re-do pairing (press the button on the case for 5 seconds).
• 🔊 Check the sound balance in the smartphone settings: on Android go to Settings → Sound. → Balance stereo and make sure the slider doesn't move to the left.

If you've done this, you still don't have your left earphone working, move on to the next step, but remember, 15 percent of the time, the problem is that the headphones and the phone are not compatible, and Redmi Buds 4, for example, can conflict with Android 10 or lower because of an outdated Bluetooth stack.

⚠️ Warning: Never use abrasive materials (steam, metal brushes) to clean your contacts, which will damage the gilded coating and impair conductivity.

2. Resetting headphone settings: when and how to do

If the left earphone connects to the phone but there is no sound, there is a high probability of software failure, which is especially true after updating the firmware of the headphones or smartphone, in such cases, helps hard reset, which returns the headphones to the factory settings.

Instructions for most Xiaomi Redmi models:

1. Put both headphones in the case and close the lid.
2. Press and hold the button on the case for 10-15 seconds (until the white/red indicator flashes).
3. Remove the headphones from the case – they will automatically go into pairing mode (blinking white LED).
4. Connect them to your phone again via Bluetooth.

Make sure both earphones are charged (>30%)

Close all applications that use Bluetooth (music, games)

Disconnect headphones from all previously associated devices

Prepare a charging cable (in case of discharge during the process)-->

For the Redmi Buds 4 Pro and Redmi Buds 5, the process is slightly different.

1. Get the headphones out of the case.


2. Press the touch panels on both headphones for 10 seconds.




3. Wait for the double beep and flashing red/white.




4. Return the headphones to the case and repeat the pairing.

After the reset, check the sound. If the problem persists, proceed to the diagnosis of hardware malfunctions. But first make sure that the reset was successful: the Xiaomi Earbuds application should display the default firmware (for example, V1.2.0.4 for Redmi Buds 3).

3. Hardware breakdowns: how to diagnose without disassembly

If the software methods didn't work, it's probably a physical malfunction.

For preliminary diagnosis, perform the following tests:

• 🎧 Microphone check: Call the headphones and ask the person to confirm if they can hear you, and if the microphone is working and there is no sound, the problem is the speaker or the plume.
• 🔋 Autonomous test: fully charge the earphone and check how long it lasts. If less than 30 minutes, the battery is to blame.
• 💧 Moisture check: inspect the headphone for corrosion (white plaque) or condensation under the speaker grid.

If the headphone fell or came into contact with water, 90% of the probability that you will need to replace components. In models Redmi Airdots 2 and Buds 3 most often fails flexible plume that connects the board to the speaker — it can be replaced by yourself, buying a remake on AliExpress (cost ~ 300-500 rubles).

⚠️ Warning: Do not try to disassemble headphones without special tools (plastic mediators and tweezers). the case Xiaomi Redmi is sealed, and if you disassemble it carelessly, you can damage the microphone or Bluetooth antenna.

4.Firmware problems: how to update or roll back

In 20 percent of cases, the left earphone stops working after an automatic firmware update. For example, in Redmi Buds 4, V1.7.1.0 had a stereo-sync bug that only got fixed in V1.7.1.2. If your headphones were recently updated, try rolling back the firmware or force a new one.

How to check and update the firmware:

1. Install the official Xiaomi Earbuds app (available for Android and iOS).
2. Connect the headphones to the phone and open the application.
3. Go to the Settings section → Update the firmware.
4. If a new version is available, click Update and wait until it is completed (the headphones should be in a case with the lid open).

If the update doesn’t help or doesn’t, try the forced flashing via PC:

1. Download the firmware for your model from https://new.c-mi.com/ (Support section).


2. Connect the headphones to the PC via Bluetooth.




3. Use the Xiaomi Flash Tool or QFil utility to install firmware manually.




4.Reset the headphones (return to the case for 10 seconds).

For Redmi AirDots Pro and later, there is an alternative method of resetting firmware via ADB:

adb shell am start -a android.bluetooth.device.action.PAIRING_REQUEST -n com.android.bluetooth/.opp.BluetoothOppLauncherActivity

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Before updating your firmware via PC, disable the antivirus – it can block firmware utilities as “suspicious software.”

5. Bluetooth conflicts on a smartphone

Sometimes the problem isn’t with your headphones, but with your smartphone’s Bluetooth settings, especially for Android 11+ devices, where dual audio (simultaneously connecting to two devices) has been introduced, which can knock the stereo pair synchronization down.

What to check on your phone:

• 📵 Turn off power saving mode for Bluetooth: Settings → Battery → Energy conservation → Bluetooth (disable optimization).
• 🔄 Reset network settings: Settings → System system → Reset → Resetting Wi-Fi, Mobile Network and Bluetooth.
• 🎵 Disable monoconnection: in some firmware (for example, MIUI 13) Headphones can automatically switch to mono mode. Check Bluetooth Settings → Additionally. → Sound mode (select "Stereo").
• 📱 Check conflicts with other devices: if the headphones have previously connected to a laptop or tablet, they may stick on the old device.

If you have a Xiaomi/Redmi/Poco smartphone, check the MIUI settings:

1. Open Settings → Connections and Sharing → Bluetooth.
2. Click on the gear icon next to the connected headphones.
3. Turn off the options Absolute volume and Double audio.
4. Reboot the phone.

On the iPhone, the problem may be related to iOS restrictions on uncertified devices.

1. Forget the headphones in the Bluetooth settings.
2. Turn on the Airplane mode for 30 seconds, then turn it off.
3. Connect the headphones again, holding the button on the case until it appears in the list of devices.

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If the left earbud runs on one device (like Android) but doesn’t work on another (iPhone or PC), the problem is precisely with the Bluetooth settings of the second gadget, not the headphones.

6. Repair with your own hands: when justified

If the diagnostics show a hardware breakdown and the headphones are no longer warranty, you can try to repair them yourself, and let's look at the three most common cases that even beginners can handle.

1. Battery replacement (relevant for Redmi Airdots) 2/3):

• 🛠️ Tools: plastic mediator, tweezers, soldering iron (power 30 W), solder, new battery (for example, C103457 for Airdots 2).

Cleaning of charging contacts (for all models):

• 🔍 Instructions: Wet the stick in alcohol and gently wipe the contacts on the headphone and in the case. With a toothpick remove the oxides from hard-to-reach places (do not scratch!). Dry for 10 minutes (you can dryer in cold air).

Recovery of the flexible plume (for Redmi Buds 3/4):

• 🧩 Details: new plume (the article depends on the model, for example, XM-005 for Buds 3), tweezers, glue B-7000.

Cost of repair in the service:

⚠️ Warning: If after self-repair, the earphone begins to warm or discharge quickly, immediately turn it off - this is a sign of a short circuit.

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

Not all malfunctions can be fixed at home, here are 5 signs that headphones need professional repair:

• 🔥 Overheating of the body (earphone becomes hot after 5-10 minutes of operation).
• 💥 Unintentional shutdowns (every 1-2 minutes, even when fully charged).
• 🎛️ Distorted sound (constant wheezing, crackling, even after resetting).
• 🔋 The battery does not hold a charge (discharges in 10-15 minutes with a full charging cycle).
• 📡 Loss of communication with the case (the earpiece is not charged and is not determined by the cover).