The situation when the right or left headphone Xiaomi stops synchronizing with the main module, is one of the most common problems users. TWS-This often happens after the battery is drained, the smartphone is updated, or the pocket is accidentally out of sync. The owner is faced with the fact that the device sees only one part of the headset, or the sound is played exclusively in mono mode, which completely destroys the impression of listening to music or communicating.
In most cases, the problem is not hardware failure, but software failure of the logic of pairing between left and right modules. Headphones Xiaomi and Redmi use proprietary communication protocols that can fail when abruptly switching Bluetooth sources or disconnecting the connection. Understanding the principle of the master device and the slave module will help to diagnose the malfunction faster.
Before you bring a gadget to a service center or make a return, you need to perform a series of actions to force the reboot and clean up the connection profiles. Statistics show that more than 80% of the cases of “breakdown” of one of the speakers are solved by a competent Hard Reset. In this article, we will analyze in detail the algorithms of actions for different models, from budget Redmi AirDots to flagship Mi True Wireless.
Diagnosis of the problem: why the second headphone is silent
The first step is always to make a thorough diagnosis, because symptoms can be misleading. Often users believe that the earphone is broken, when in fact it is simply discharged or contaminated with contacts. The contact group on the charging case and the earpiece itself becomes oxidized or covered with earwax over time, which prevents charging. If the indicator on the problem module does not light up when installed in the case, the problem is most likely physical.
Another common reason is the desynchronization of communication channels. TWS-In systems, one headphone (master) connects to the smartphone and transmits a signal to the second (slave). If the master earphone "forgot" its partner, the second module goes into standby mode and does not respond to commands. This often happens if you plugged the headset into another phone or tablet without performing the pre-unpair (forget device) in Bluetooth settings.
⚠️ Warning: If the headphone emits a quiet intermittent beep or flashes an indicator at a different frequency, this may indicate a critically low battery charge or a deep discharge of the battery that requires prolonged recharging (until the battery is recharged). 30-40 minutes before attempting to switch on.
Also worth considering is the software conflicts on the smartphone side: Updating the Android or iOS operating system sometimes changes the algorithms of working with Bluetooth protocols, which leads to incorrect distribution of audio channels, in which case the system can send sound to only one channel, ignoring the second, even if the connection is formally established.
Basic reboot and clear Bluetooth list
The easiest and most effective method to try first is to completely reset the Bluetooth cache on your smartphone and delete the headset profile. Don't just turn off Bluetooth in the notification curtain; go into the deep system settings. Find your model (such as Redmi AirDots 2 or Mi True Wireless Earbuds Basic) in the list of devices and select the "Forget device" or "Unpair."
After that, it is recommended to turn off Bluetooth completely on the phone, and then turn it on again. If the problem is not solved, try restarting the smartphone itself. This action clears the temporary files of Bluetooth drivers and resets the state of the radio module. Often it is the "sticky" process in the background that prevents the correct initialization of dual-channel audio.
Now you have to put both earbuds in the charge case and close the lid (if you have one), or just leave them in the contacts for 10-15 seconds. Make sure the case is charged. Then remove both earbuds at the same time. If they start flashing white (or red, depending on the model) and looking for each other, then the initial mating process is underway. At this point, you can try to connect to them from the phone again.
☑️ Pre-reset check
Hard Reset Methods for Different Xiaomi and Redmi Models
If standard reconnecting fails, a forced Hard Reset is required. The algorithm may vary depending on whether there is a physical button on the case or touch zones on the headphones themselves. For models without a button on the case (for example, the AirDots series), touch control is used.
You need to remove both headphones from the case. If they're on, turn off their long press (about 5-7 seconds) until the lights go out. Then, when they're off, press and hold the touch zones on both headphones simultaneously. Hold them for a long time, about 20-30 seconds. They can turn on first, then turn off, and only after that the indicators can flash several times (usually in red or white), signaling a reset.
For models with a button on the case (such as some versions of Mi True Wireless or Redmi Buds), the procedure is simpler. Put the headphones in the case, leaving the lid open. Find the function button on the case case case (usually between headphone sockets or on the end). Press and hold it for 15-20 seconds until the indicators inside the case flash a certain way (often white 2-3 times).
| Model headphones | Type of discharge | Duration of retention | Indication of success |
|---|---|---|---|
| Redmi AirDots / Earbuds Basic | Touch (off the case) | 20-30 seconds | Triple flashing red |
| Mi True Wireless Earbuds | The button on the case | 15 seconds. | White flashing of indicator |
| Xiaomi FlipBuds | Touch (in case) | 10 seconds. | Case indicator flashes |
| Redmi Buds 3/4 Pro | The button on the case | 10-15 seconds | The indicator goes out and lights up. |
⚠️ Warning: During Hard Reset, keep your headphones close to each other (no more than a distance away). 5-10 (cm) so they can find each other immediately after resetting the settings. If you spread them far away, the synchronization process may not be complete.
What to do if sensors do not respond?
Problems with charging and contact group
Often the reason one earphone doesn't connect is because it's got a simple lack of charge in its battery, so if one module is zero, it won't be able to initiate the connection process, visually it might look like a functional device, but inside its power controller, it's locked down, and you need to make sure you're in stable contact with the charger.
Carefully inspect the contact areas (gold pins) on the earphone itself and inside the case, often accumulating dust, pile from your pocket or oxide. Use a dry cotton swab or stick slightly soaked in isopropyl alcohol to clean. Mechanical pollution is the number one enemy for cleaning. TWS-scaling, as it creates an insulating layer.
Sometimes the problem lies in the case itself. If one of the contacts inside the case has gone in or deformed, the earphone will not charge. Try to gently (without fanaticism) press the earpiece in the case with your finger to improve contact, and see if the charging indicator lights up. If the indicator only lights up after pressing, then the problem is mechanical contact, and the earpiece should be fixed in the case with a rubber band or patch during charging.
💡
Use a soft bristling toothbrush to clean the speaker mesh and contact pins carefully. Dry cleaning is often more effective than chemistry, as alcohol can drive dirt deeper if not first swept away.
Program conflicts and smartphone settings
In Bluetooth Android, there is an option called "Absolute Volume" that sometimes conflicts with Xiaomi codecs. Try going to the developer menu (you need to click on the build number 7 times in About Phone) and find the item "Absolute Bluetooth Volume." Try to change its state (on or off) and reboot the phone.
It also makes sense to clear the cache of the Bluetooth service itself on Android. Go to Settings → Apps → Show system processes → Bluetooth. Select Storage and click Clear Cache and Erase Data. This will delete all saved profiles and reset the phone's radio module settings to factory settings, which often helps with strange connection glitches.
Check to see if Mono-audio is activated in your smartphone's special features, which are designed for hearing-impaired people and bring the stereo to a single channel that can only be output to one device. The path to setup is usually: Settings → Advanced Settings → Special Options → Hearing → Mono-audio. Make sure the switch is off.
When repairs or replacements are needed
If all the methods of software reset, cleaning contacts and reconnecting are exhausted, and one earphone is still silent, most likely there is a hardware malfunction. The most common reason is battery failure. Lithium polymer batteries in miniature headphones have a low cycle life and can degrade in 1.5-2 years of active use. If the earphone does not hold a charge or does not charge at all, you need to replace the battery.
The second option is damage to the Bluetooth module or speaker due to falling or getting moisture. Even if the body looks whole, the internal moisture could cause the board to corrosion. In such cases, self-repair is possible only with soldering equipment and donor parts, but for most users it would be more rational to contact the service or replace the device.
It is also worth considering that if the headphones were bought separately (left and right from different sets), they may be incompatible software, even if the model is the same. The firmware versions and revisions of the board may differ, which makes their pairing impossible without flashing through a special programmer, which is almost impossible to do at home.
💡
If after Hard Reset and cleaning contacts, the headphone does not show signs of life (there is no glow of the indicator when removed from the charged case), the problem with a 95% probability is a malfunction of the battery or power chain.