The situation when the right or left TWS-The headphone stops seeing the "partner" and starts working independently, one of the most common problems in the world of wireless acoustics. Users often find that after extracting from the case, one ear connects to the phone, and the second one is silent or plays a different tune. This condition, known as out-synchronization, can occur suddenly, for no apparent reason, turning listening to music into a stress test for the nervous system.
The reasons for this behavior lie in the peculiarities of the Bluetooth protocols and pairing algorithms laid down by the engineers Xiaomi, Redmi and QCY. Sometimes the culprit is a software failure of the smartphone operating system, which incorrectly processes requests for connecting two identical devices.
Don't panic and bring the device to the service center right away. In 90% of cases, you can restore normal operation yourself by performing a series of simple manipulations to reboot and clean the pairing list, the main thing is to understand the logic of the Master-Slave or True Wireless Stereo, so that you can properly initiate the rematching process.
The main reasons for the dissynchronization of headphones
The first thing you need to do is eliminate the trivial physical factors, and if one headphone is discharged more than the other, it may not be able to pair while the other is already trying to find the phone, and it's also worth checking the charging contacts in the case: pollution or oxidation can prevent the device from fully charging, which causes the device to go into deep sleep.
Software conflicts on the smartphone side also play a role: Android or iOS can “remember” headphones as two different devices if they have previously tried to connect unsuccessfully, which leads to the phone trying to connect only one module, ignoring the second, or creates two profiles with the same name.
There's a rarer, but possible, cause, which is radio interference, and if you're in an area with a lot of Wi-Fi routers or other Bluetooth devices running, the communication protocol can be broken, and in that environment, the master earphone loses communication with the second module, and the stereo falls apart.
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Keep your headphones away from powerful radiation sources, such as microwaves or routers, during the initial pairing process.
⚠️ Attention: If one of the headphones fell into the water or suffered a severe impact, the problem may be hardware. In this case, the software reset will not help, and you will need a diagnosis of the speaker or boards.
Checking the charge and contact status
Before you go into the complex manipulation of the code and the developer menu, make sure that both earbuds have sufficient charge. Often, one module has discharged "to zero" and gone into deep discharge mode, which causes it to not respond to touch and does not flash the indicator. Put both earbuds in the case and leave them to charge for at least 30-40 minutes, even if the indicators indicate a full charge.
Pay special attention to the cleanliness of the contacts. In the process of operation, skin fat, dust and pile accumulate on the metal headphones and inside the case. This creates high resistance, and the current simply does not reach the battery. Use a cotton swab slightly moistened in alcohol to clean, but do not overdo it with moisture.
After cleaning, check the indication. When you put it in the case, the LED should light up. If one of the headphones doesn't show a reaction to the case, try moving it or wipe the contacts again. Lack of response to charging is a sure sign that the device won't turn on and will not be able to connect with its "brother".
- 🔋 Check the charge level of both headphones through the widget on the smartphone screen.
- 🧹 Wash the contact areas with alcohol on headphones and inside the case.
- ⏳ Leave the devices in the case for 40 minutes to align the charge level of the cells.
- 👀 Make sure the LEDs light up when installed in the charging case.
☑️ Diagnosis before reset
Complete Reset (Hard Reset)
The most effective way to solve the problem of desynchronization is to perform Hard Reset, which forcefully erases the memory of previous connections inside the headphones themselves and causes them to re-discover each other, ignoring the old settings of the phone, and it is important to follow all the steps consistently and quickly.
For Xiaomi Redmi Buds, AirDots and Mi True Wireless, the procedure often looks the same: first, remove the device from the Bluetooth list on the phone (forget the device). Then place both headphones in the case, but do not close the lid. On some models, you need to pinch the touch zones on both headphones simultaneously for 10-15 seconds until the indicators flash red several times.
For models without a physical button on the case (such as the Xiaomi Buds 3T Pro or Redmi Buds 4), reset can be done through prolonged retention of touch zones on the headphones themselves while they are in the ears or in the case, depending on the specific firmware revision.The exact combination for your model is better to look for in the manual, but the universal method is removal from Bluetooth and re-pairing.
Secret method of dumping through the application
Once reset, the headphones will go into fast pairing mode (usually a quick flash of white or blue light), at which point you immediately open the Bluetooth list on the phone and click "Plug in." If everything goes well, the master earpiece will first connect, and then the second one will "clung" to it, and you will hear the characteristic connection sound or voice confirmation.
Bluetooth Settings and Cleaning Android Cache
Sometimes the problem is not the headphones, but the "garbage" that has accumulated in the Android system. The operating system may not properly allocate resources of the Bluetooth module. To solve this problem, you need to clear the cache of the Bluetooth system service. This is secure and does not delete your personal data, but resets the settings of network connections.
To do this, go to Settings → Applications → All Apps. In the upper right corner, click on three dots and select Show System Processes. Find in the list of Bluetooth (or Bluetooth MIDI Service, Bluetooth Share). Go inside and select Clear Cache and Clear Data.
After cleaning the Bluetooth data, all the stored devices will be removed from the phone’s memory.You will have to reconnect not only the headphones, but also the smartwatch or fitness bracelet if they were paired.This is a necessary step to eliminate software conflicts that interfere with the proper operation of the device. TWS-protocol.
| Action. | Where to find out. | The result |
|---|---|---|
| Remove the device | Bluetooth settings | Breaking the phone connection |
| Clearing the cache | Annexes → Bluetooth | Resetting OS network errors |
| Resetting headphones | Touch zones/button | A full-bodied couple inside |
| Phone reboot | Menu food | Update of Bluetooth drivers |
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Cleaning up the data of a Bluetooth system application often solves the problem when the phone sees the headphones, but cannot transmit sound to them or connects only one channel.
Use of the Xiaomi Earbuds app
For owners of the Xiaomi and Redmi ecosystem, Xiaomi Earbuds (formerly Mi True Wireless) can be a real salvation, allowing not only to adjust the equalizer, but also to diagnose the condition of each earpiece separately. If one ear does not connect, the app can show its real charge, which will help to determine whether the module is alive.
The app often has a firmware update feature (Firmware Update) that developers regularly release patches that fix connection and stability bugs. If your headphones are unstable, check for updates. The process takes a few minutes, but requires the headphones to be connected to and lying next to the phone.
You can also reset your app through the GUI if the physical buttons don't respond. The Settings section (cog) often contains the option "Twice press to reset" or the direct "Unlink & Reset" button, which is especially true for new models where there are no physical buttons on the case.
Hardware malfunctions and when to carry for repair
If neither software method worked, and the headphones still refuse to work in pairs, there is a high probability of hardware failure. Most often, the battery of one of the modules fails. Lithium polymer batteries in miniature headphones degrade quite quickly, especially if the device often ran out of charge or was in the cold.
Another common problem is the failure of the Bluetooth antenna or charge controller inside the earphone, which can happen after a fall, moisture or a voltage surge when charging with an unoriginal power supply, in which case one earphone simply stops turning on or turns on, but does not transmit a signal.
There is also a “deep discharge” effect, where battery voltage drops below a critical threshold and normal charging can no longer “swing” the battery. Service centers use special chargers with a “wake-up” function to revive such batteries, delivering a low-power pulse current.
⚠️ Warning: Don't try to open the headphones yourself. They're ultrasonic welded, and once you open them, they're permanently leaky, and it's almost impossible to put them back together without any glue.
You can diagnose a hardware malfunction by eliminating it. Connect your headphones to another smartphone. If you have one headphone that doesn't work, the problem is the headset. If the other phone is working perfectly, your main smartphone's Bluetooth module is in conflict, and you need to look for the problem in its settings or drivers.
Prevention of Connection Problems
To keep the disconnect problem from coming back, you need to stick to simple rules of operation. Try not to keep the headphones in the case empty for a long time. If you don't plan to use them for a month or more, charge them up to 50-60% and remove them from the case, stored in a dry place. Deep discharge is destructive to micro-batteries.
Regularly update the firmware of the headphones through the app. Xiaomi often improves the connection algorithms in updates. Also remember to periodically clean the contacts in the case to ensure a full charge every time. Good contact is the key to a long battery life and stable operation.
Avoid using headphones in areas with extremely strong electromagnetic fields, if possible. Although current Bluetooth 5.0 and higher standards offer good interference protection, physics is physics, and communication can be lost in the vicinity of powerful transmitters.