When a pair of Xiaomi or Redmi wireless headphones only play one side of the sound, it's one of the most common user complaints, and it can happen suddenly: you take the headset out of the case, and instead of stereo, you hear a stereo bang or a complete silence of one of the channels, most often the problem is not the physical breakdown of the speakers, but the dissynchronization of the software module or contamination of the contact areas.
Before you carry the device to the service center or buy a new pair, you need to exclude software failures that are easily fixed at home. Bluetooth protocol conflict or different battery levels can cause one earphone to stop being perceived as part of a stereo pair and work in headset mode. In this article, we will discuss a step-by-step algorithm of actions that will help restore the performance of your headset. TWS-device.
It's important to understand that today's wireless headsets are complex microcomputers that require proper maintenance, and ignoring simple rules of operation, such as cleaning contacts regularly or completely draining the battery, is often the root of the problem. Let's go into detail about all the possible causes and methods of eliminating them.
Diagnostics and primary inspection of the device
The first step is always to make a thorough visual and functional diagnosis. Often users panic ahead of time, not noticing that one of the headphones simply did not turn on because of oxidized contacts. Carefully examine the case and the headphones themselves for dirt, pile or moisture. Even a microscopic film of oxide on the contact pins can block charging, which causes one earphone to discharge faster and shut down.
Try playing audio from different sources. Connect the headset to your smartphone, then to your laptop or tablet. If the problem persists on all devices, it's the headphones. If the other gadget has stereo sound, you have to look for the reason in the Bluetooth settings of a particular phone. Sometimes the cached data of the old connection interferes with the correct operation.
⚠️ Warning: If you notice signs of moisture entering the body or a characteristic green coating on the contacts, do not attempt to charge the device.
Check the channel balance in your smartphone settings. In rare cases, a system failure of Android or iOS can shift the sound balance completely to one side, creating the illusion of a broken earphone. Make sure that the balance slider is strictly in the center.
Complete Reset (Hard Reset)
The most effective way to fix software errors is to completely reset the settings to factory settings, which causes the headphones to forget all previous connections and re-synchronize with each other in stereo pair mode. For the Redmi AirDots, Mi True Wireless Earbuds and Xiaomi Buds models, the algorithm may differ slightly, but the general principle is the same.
First, remove the device from the Bluetooth list on your phone. Find the name of your headset in the wireless connection menu and click "Forget this device" or "Disable." After that, place both earbuds in the charging case and make sure they start charging (the indicators should catch fire). If the indicators don't burn, wipe the contacts with a dry cotton swab.
☑️ Algorithm of resetting headphones
Now, to the reset process itself, depending on the model, you may need to pinch the touch areas on both headphones simultaneously for 20-30 seconds. The indicators should flash several times (usually in red or white), which signals a successful reset. Then place them back in the case, close the lid for 10 seconds, then retract again.
Turn on Bluetooth on your phone and search for new devices. Now your headphones should be defined as a single stereo device, not as two separate mono-earphones. If the Bluetooth list still shows two identical names (for example, "Mi True Wireless EBs") Basic_R" and "... L"), which means that the synchronization has not passed, and the procedure must be repeated, paying special attention to the retention time of the sensors.
Reset nuances for different models
Problems with charging and contact
A common reason why one earphone stops working is the banal lack of charge in its battery, which occurs when contact between the legs of the earphone and the magnetic saws in the case is disrupted, and over time, skin fat, dust and oxides accumulate on the contacts, which act as an insulator.
To clean, use a cotton swab slightly soaked in alcohol or a special electronics cleaner. Gently wipe the gold contacts on the headphones themselves and inside the indentations of the case. Let the alcohol completely evaporate before inserting the headphones back. Also check if the magnets or spring-loaded contacts inside the case are stuck.
| Symptoms. | Probable cause | Method of decision |
|---|---|---|
| The indicator does not burn when installed in the case | Contamination of contacts or discharge to zero | Cleaning with alcohol, long-term charging (30+ min) |
| The earpiece flashes but doesn't charge. | Poor contact or battery wear | Swinging in the nest, checking the cable |
| Charged only in a certain position | Magnet displacement or body deformation | Fixing the position, replacing the case |
| Fast discharge of one of the channels | Battery degradation (memory effect) | Battery training or replacement |
If one of the headphones went zero and was in this state for several months, its lithium-ion battery could go into a deep discharge, in which case standard charging may not start the process immediately. Leave the headphones in a closed case on charging for 1-2 hours, even if the indicators do not show activity. Sometimes it takes time to "rock" the battery.
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Use only the original cable or certified analogues to charge the case. Cheap cables with thin wires can give insufficient current, which will cause one of the headphones (usually the right one, which is often a master device) to charge more slowly or not at all.
Bluetooth and multimedia settings
After a successful reset and cleanup, it is important to set up the connection correctly. Modern Xiaomi and Redmi smartphones have their own shells (MIUI, HyperOS) that can aggressively optimize Bluetooth to save power, which sometimes leads to the system “sleeping down” one of the data channels.
Go to Bluetooth settings, find your device, and click on the gear or arrow icon next to the name. Make sure Multimedia and Audio profiles are activated. If you have the option to "Absolute Volume," try to change the state (on or off), as the volume dissynchron can also be perceived as no sound.
In the For Developers section (which is activated by repeatedly clicking on the build number in About Phone), you can find additional codec settings. Try switching the codec from AAC to SBC or vice versa. Sometimes the Bluetooth driver of a particular smartphone does not work correctly with a specific codec, which leads to the loss of one channel.
⚠️ Warning: Don't leave your headphones on for long periods of time, they can go to zero, which is critical for a power controller. Always put them in the case immediately after use.
It's also worth checking if the device is connected to other gadgets within range. If your headphones have previously been paired with a tablet or laptop that's right next to you and on, they can automatically connect to it, intercepting the control channel. Disable Bluetooth on all foreign devices during setup.
Hardware malfunctions and wear
If the software, reset and cleaning didn't work, there's a high probability of hardware failure. Inside every Xiaomi headphone is a miniature board, speaker and battery. If you fall or hit, the speaker plume could move or the soldering could be damaged. Visually, you can't tell without opening, which is almost impossible to do without damaging the case.
Another common problem is battery failure: Lithium batteries have a limited lifetime of charge-discharge cycles. If your headphones are over 2-3 years old and you've been using them extensively, the battery capacity could degrade so much that it doesn't hold charge even after full charge, in which case one earphone can last 10 minutes and the other one an hour.
Speakers are also prone to wear. The sulphur from the ears into the speaker's mesh creates a tight plug that not only silences the sound, but also creates pressure that can damage the membrane. Regularly cleaning the mesh with a soft toothbrush significantly prolongs the life of the acoustic system.
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If after resetting, cleaning contacts and reconnecting to different devices, only one headphone works - most likely, the problem is hardware in nature (a dead battery or a burned-out Bluetooth module).
Prevention and proper care
To avoid a repeat of a channel desynchronization or failure situation, it is important to follow the rules of operation. Don't let the headphones go deep: if you don't plan to use them for a long time, charge them up to 60-70% and remove them from the case (or charge once a month if they remain in the case).
Regularly wipe the case and headphones with dry cloth. Avoid using the headset in conditions of high humidity or dust without protection. Sweat entering the case causes corrosion of contacts faster than water.
Periodically update the firmware of the headphones through the application Xiaomi Earbuds or Mi Home. the company's engineers constantly release patches that improve connection stability and fix energy saving bugs. The current version of the software is the key to long-term operation of the device.