Only One Xiaomi Headphone Works: A Complete Repair Guide

When only one of the Xiaomi Redmi Buds or Mi True Wireless pair of wireless headphones sounds, it is one of the most common complaints of budget acoustics owners. Users often experience the left or right channel suddenly stop transmitting sound, although the charge indicator on the body burns properly, which causes natural irritation, because the device turns into a mono headset, which is especially critical when watching movies or listening to music with wide stereo panning.

The causes of this malfunction can be both software and hardware. In most cases, the problem lies in the desynchronization of channels between themselves or with the sound source, which is solved by software reset. However, more serious problems such as oxidation of contacts or failure of the battery inside one of the modules, which requires deeper intervention, cannot be excluded.

In this article, we will discuss the algorithms for diagnosing and restoring your headset, how to force the device to steam, check the settings of your smartphone, and determine when the software methods are no longer useful, and carefully following the instructions will allow you to return full stereo in 80% of cases without going to the service center.

Diagnostics and primary inspections

Before you start to manipulate the complex resets, you need to eliminate basic connection errors. Often, a smartphone automatically connects to the last active device, ignoring the second headphone that is in the case. Check the list of Bluetooth devices in your phone's settings: if it displays two identical names instead of the same common headset name, then the stereo has broken up.

Also worth paying attention to is the charge level. If one of the headphones is completely discharged, the power controller could block it to protect the battery, insert both modules into the charging case and leave them for at least 30-40 minutes, even if the indicators show full charge. Lithium polymer batteries tend to show false voltage values after deep discharge, and they take time to calibrate.

⚠️ Warning: Don't try to disassemble the headphone body immediately if it stops working. Internal components are extremely miniaturized, and a careless opening is guaranteed to damage the plumes or membranes of the speaker.

Make sure that the problem is not in the sound balance of the smartphone itself. Go to the special features settings (the "Hearing" or "Audio" section) and check the left-right channel balance slider. Sometimes after updating the Android or MIUI operating system, the settings may get lost, and the sound will be software-dampened on one of the channels.

Complete Reset (Hard Reset)

The most effective way to eliminate the out-of-synchronization is to completely reset the headset to the factory, a process that causes the microcontrollers inside the headphones to forget all previous pairings and re-find each other to create a single stereo pair. The algorithm may differ slightly from Xiaomi to Redmi, but the basic principle remains the same.

First, remove the device from the Bluetooth list on your phone. Click on "Forget the device" or "Cancel pairing." Then put both headphones in the charge case, but do not close the lid. Find the function button on the case case case case (usually it is round and located between the compartments or on the back panel).

Press the reset button and hold it near 20-30 The headphones should flash a lot, usually white or orange, and then go out. This is a signal that the controller memory is cleared. Now try to pair again, like with a new device.

If your model doesn't have a physical reset button on the case, touch reset is used. Take the headphones out of the case and simultaneously touch the touch zones on both modules. Hold your fingers for 5-7 seconds until the indicators light up red, then let go. Repeat the procedure again, holding the touch longer - up to 15-20 seconds until the reset occurs.

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For models without a reset button (e.g. Redmi AirDots 1), it is critical to touch the sensors in sync. If you don't get it the first time, try tapping your headphones lightly against each other's ends to align the sensors in height before pressing.

Problems with charging and contact group

A common reason that one earphone doesn't turn on or work is the banal lack of contact with the charging case: Inside the case are spring-loaded pins (or magnetic pads) that must come into contact with the feedback contacts on the leg or end of the earphone, and over time, the contacts accumulate oxidant, earwax and dust, creating an insulating film.

Take a cotton swab, lightly moisten it in isopropyl alcohol or dry alcohol (do not use water or aggressive chemistry under any circumstances), and thoroughly wipe the contact pads on the headphones themselves and inside the recess of the case. Mechanical cleaning allows you to restore the electrical circuit necessary for charging and transmitting the control signal.

Also check if the headphones fit tightly in the case. If the plastic case is deformed or fine dust gets into the case, the earphone may not fully sit in the nest. In this case, the indicator on the case may not light up when you install the module, which indicates that there is no charging. Try to press the earphone slightly with your finger for a couple of seconds - if charging has started, then the problem is in the mechanical press.

Operating system and codec settings

Sometimes the problem isn't with the headset itself, but with how the smartphone handles the audio stream. In Bluetooth settings on Android, there's an option called "Absolute Volume Level." If this setting isn't working properly, the volume on the phone and headphones can become out of sync, making one channel sound quieter or disappear altogether. Try turning on or off this switch in the Developer Menu.

Also worth paying attention to the audio codec used. If you connect your headphones to a smartphone of another brand (not Xiaomi), there may be conflicts when switching between SBC, AAC and aptX codecs. In the Bluetooth connection menu, click on the gear next to the device name and try to force the codec to a more basic one, such as SBC, to check the stability of the work.

⚠️ Attention: The Developer Menu is hidden by default, and you need to quickly click on the build number in the About Phone section 7 times to activate it. Be careful when changing unknown parameters, this can affect the operation of other wireless interfaces.

Xiaomi Earbuds (or Mi Buds M8 for iOS) is a special feature, which can be used to check the firmware’s relevance, manufacturers regularly release updates to fix connection bugs, and if the software version is outdated, the likelihood of channels being out of sync increases significantly.

Hardware malfunctions and repairs

If software, contact cleaning and complete resetting didn't work, it's likely that there's a hardware breakdown, and the most common reason is that the battery inside one of the headphones fails, the battery might swell, lose capacity, or its charge controller has gone into a deep protective mode that's no longer software-enabled to escape.

The second option is to damage the plume of the speaker or the soldering dump inside the compact housing. TWS-All the components are connected by the finest wires, and when you fall or have a strong vibration, the contact can be disrupted. It's visually difficult to determine, and you need to disassemble and vertebrae with a multimeter.

The third scenario is the combustion of the Bluetooth module, which happens when moisture is injected or voltage surges are used with low-quality chargers, in which case the earphone can be charged (the indicator is on), but not connected to the phone and not transmit sound.

Redmi AirDots and Mi True Wireless

Popular first-generation models like the Redmi AirDots and Mi True Wireless Earbuds Basic have a famous feature: They use a connection protocol where one headphone (master) connects to the phone and the second (slave) connects to the master, and if the connection between the master and the plume is lost, the second headphone is silent.

For these models, there is a secret combination for forced steaming: you need to pull the headphones out of the case, turn off Bluetooth on the phone, then quickly touch the sensors on both headphones 5 times at the same time. For the 5th time, they should blink and go into search mode for each other. Only after they find each other (one of them will stop blinking or blink less often), you can turn on Bluetooth on the phone.

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The main feature of Xiaomi’s budget models is that there is no automatic reconnection between channels. If the desynchronization has occurred, manual reset is the only working method for restoring the stereo mode.

Newer models like the Xiaomi Buds 3 or Redmi Buds 4 Pro use an improved dual-transmission protocol where each earphone connects to the phone independently, reducing the likelihood of losing one channel but making the reset procedure more dependent on Firmware.

When is the time to buy new headphones?

Life of lithium batteries in TWS-headphones are limited by the number of charging cycles and the time, on average, through the 2-3 year of active operation battery capacity falls so much that the headphone ceases to hold the charge more 15-20 If your device is more than three years old and it has stopped working, repairs may be useless.

It's also worth considering replacing if the housing is leaky. Xiaomi's low-end models often only offer water protection at the gaskets level. Over time, the glue dries up, and sweat during sports causes the board to corrosion. If you notice the green plaque on the contacts or speakers, the process of breaking the electronics is already underway.

In conclusion, most problems with the work of one earphone are solved by competent cleaning of contacts and proper execution of Hard Reset. However, if the device has been physically exposed or is of a good age, it is worth considering buying a new model, in which technologies have stepped forward.