The situation of both earbuds being removed from the case, but the sound is played exclusively in one, is one of the most common problems for wireless speakers. This phenomenon often takes you by surprise during an important call or watching a movie, causing a natural irritation. Owners of Xiaomi, Redmi and Haylou devices face this regularly, and in most cases the cause is not a physical failure, but software dissynchronization.
The main reason is that TWS-The True Wireless Stereo works as a single system, with one module being master and the other being slave, and if the communication between the two is broken, the smartphone sees only one leader, ignoring the other. This can happen after the phone's operating system is upgraded, the battery in the case is discharged to a critical level or a simple software failure. It is important to understand that before you carry the gadget into the service, you need to perform a number of diagnostic procedures.
In this article, we will take a closer look at the recovery algorithms, from simple charging manipulations to complex resets. You will learn how to distinguish a software glitch from a real speaker or battery failure. The right sequence of actions will help return a full stereo sound in 90% of cases without financial costs.
The main reasons for the desynchronization of wireless modules
The first thing to do is to understand the nature of the problem, and most often, the failure occurs when you remove the devices from the charging case, and if you take out the right earphone and the left earphone is held in the case for at least a few seconds, they may not have time to shake hands and create a single network, at which point the smartphone connects to the active module, and the second one remains in standby or sleep mode, ignoring the commands to play.
Another common cause is contamination of the contact areas: Nagar, earwax or dust, accumulated on metal contacts inside the case or on the headphones themselves, prevent full charging. As a result, one of the modules can have a charge of 0% and simply not turn on, although the LED display may behave strangely or not at all. The user sees the device on, but there is no sound, since it is physically discharged.
Also worth considering is software conflicts on the smartphone side. Bluetooth cached data may contain errors that interfere with the correct definition of the stereo pair, especially after the transition from Android to iOS or vice versa, as well as after major firmware updates MIUI or HyperOS. The system can “remember” headphones as two separate mono-devices instead of one stereo headset.
⚠️ If one of the headphones began to flash red more often than usual or does not light up at all when installed in the case, most likely, the problem is in the lack of contact for charging, and not in complex electronic damage.
Diagnostics of hardware faults and contacts
Before you go to software resets, you have to rule out physical causes. Visual inspection is the first and most important step. Carefully examine the golden or silver contacts on the bottom of each earpiece. Even a microscopic film of oxide or a layer of fat can be current. A cotton swab lightly soaked in isopropyl alcohol or a special electronics cleaner is ideal for cleaning.
Just as important is to check the insides of the charging case. The springs or pins inside the recesses should walk freely and not be pressed. If one of the contacts in the case is west, the earphone will not receive a charge and therefore will not turn on. In Xiaomi Redmi Buds and AirDots models, there is often a problem when the magnet in the case attracts the earphone, but due to the structural gap, the contact does not close tightly.
To test the performance of speakers, you can use test tracks with separate channels. There are special audio files where the sound is only on the left or only on the right. By running such a track, you can see if the dynamic head in the "second" earphone is working if it suddenly turns on. If at 100% charge and clean contacts, the speaker is silent, this is a sign of hardware failure.
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Use a soft bristling toothbrush to delicately clean the speaker mesh from sulfur, which can also muffle the sound, creating the illusion of breakage.
The table below will help systematize the symptoms and their probable causes:
| Symptoms. | Probable cause | Method of decision |
|---|---|---|
| Only one indicator is on. | Discharge of the second module | Cleaning contacts, long-term charging |
| The list of Bluetooth 2 devices | Loss of pair synchronization | Full reset (Hard Reset) |
| There's a sound, but it's quiet and hoarse. | Grid contamination | Mechanical cleaning |
| The earpiece flashes red. | Critical discharge or error | Charging more than 1 hour |
Software reset and reconnect devices
If the physical condition is perfect, we move to the software part. The most effective way to get the silent earphone to talk is to force the reset, or Hard Reset. This process brings the headphones back to factory settings, forcing them to re-find each other and create a new pair. For most Xiaomi and Redmi models, the procedure is this: put both earphones in the case, leave the lid open, and pinch the touch areas for 10-20 seconds.
The indicators should start flashing in a certain rhythm (often white or orange), which signals a successful reset, then go to your smartphone's Bluetooth settings, find the old connection, and select the "Forget device" or "Delete" option. This is a critical step, since the phone must forget the old configuration files.
☑️ Complete reset algorithm
Once you delete the profile, re-extract the headphones. They should automatically enter pairing mode. The list of available devices will appear one name (for example, Xiaomi Redmi Buds 3), not two separate ones. The connection will happen automatically. If the list again appears two identical names, then the synchronization between the left and right module is not restored, and the reset procedure should be repeated, increasing the retention time of the sensors.
⚠️ Note: During the reset procedure, do not place the headphones far apart. They must be in close proximity (in the case or near the table) to have time to establish a Master-Slave connection before connecting to the phone.
Bluetooth and operating system settings
Sometimes the problem lies deeper in the smartphone's power saving settings. Android, especially in MIUI shells, aggressively optimizes background processes, which can result in Bluetooth modules being turned off to save power. Check the battery settings for the application through which audio is played, and make sure that it is not subject to strict restrictions.
Also worth noting is the Absolute Volume feature. In some versions of Android, it conflicts with the firmware headphones, causing situations where the sound is only going to one channel. You can turn this option off from the Developer Menu. To get there, you need to click 7 times on the build number in the About section, and then find the "Deactivate Absolute Volume" item and switch it to the active state.
Hidden settings of Bluetooth Codec
Don't forget to check the firmware updates of the headphones themselves. For Xiaomi devices, there is an application Xiaomi Earbuds or Mi Wear. It often comes through patches that fix connection bugs. If one earphone falls off when playing video, but works in music, the problem may be in the desynchronization of the buffer, which is also treated with the update.
Specifics of the work of sensor control and microphones
It's worth mentioning that in some scenarios, the "default" earphone is actually functional, but it does a different function. In mono-call mode or when using voice assistants, the second earphone can go into microphone mode, removing the audio track. This is normal behavior for some communication protocols, where the resources of one channel are busy with voice transmission, and the second provides a stereo effect or noise cancellation.
Touch control can also be a source of problems. If the sensor on one of the headphones is stuck or is not working properly due to moisture, the device may constantly try to execute a command (for example, pause or switch a track) by blocking the audio stream. Wipe the surface with a dry towel and check if the earphone responds to touch through the fabric.
When repairs or replacements are needed
If all of the above methods, including alcohol cleaning, full reset, flashing and checking on another smartphone, have not worked, there is probably a hardware breakdown. Most often, the battery inside one of the modules fails. Lithium polymer batteries have a limited resource of charge-discharge cycles, and over time one of them can lose capacity faster than a partner, no longer holding charge at all.
The second option is to damage the plume or speaker by falling or getting moisture, and water, even as a vapor in the shower, can cause the contacts inside the body to corrosion, which eventually leads to a chain break, in which case, program dances with a drum are useless.
Repairing a single headphone is often economically impractical, as the cost of replacing the battery or speaker in the service can be 50-70% of the price of a new device. However, if the warranty is still valid, safely carry the device to an authorized center - this is a manufacturing defect.
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If after 30 minutes of charging and resetting the headphone does not show signs of life (no indication, no sound), most likely, the battery or speaker has died, and a replacement component is required.