The situation when a couple TWS-The headset stops sounding only one module, is one of the most common and annoying problems users of the Xiaomi ecosystem.Often owners are faced with the fact that the left or right earphone just silent, flashes the indicator or does not turn on at all while the second one works properly. This can happen with both new devices and models that have been in use for several years.
In most cases, the reason is not a physical breakdown of the speakers, but a software failure of synchronization between two modules or a violation of contacts when charging. Dissynchronization leads to the fact that devices stop “hearing” each other and transmitting audio to both channels. Panic and carry the gadget to the service center immediately is not worth it, since in 90% of cases the problem can be fixed on your own.
In this article, we will discuss in detail the algorithms of actions to restore the health of your headset. We will look at methods of hardware reset, cleaning contacts and settings through the Android system menu. The critical point is the sequence of actions during repairing, the violation of which often leads to a repeat of the error.
The main reasons for the failure of one of the modules
Before you start to act, you need to understand the nature of the malfunction. Most often, the problem is software-based. The first scenario is the loss of communication between the master and the secondary headphone. In True Wireless technology, one module usually receives a signal from a smartphone and broadcasts it to the second one. If this channel is broken, the sound will go to only one speaker.
The second common cause is uneven battery discharge or contact oxidation. If one of the headphones was in the case for a long time and did not charge due to poor contact with pins, it will simply go into a deep discharge.
Physical damage, such as moisture or impact, is less common, but it can't be ruled out. If the headset was operated in high humidity or mechanically exposed, the speaker plume could move away or the board could be damaged. However, if the device is intact, first of all, we diagnose software failures.
- 🔋 Uneven battery charge or deep discharge of one of the modules.
- 📡 Software Dissynchronization of the Link Between Left and Right Channels.
- 🔌 Oxidation or contamination of charging contacts in a case or on a headphone.
- 📱 Bluetooth cache errors in the smartphone operating system.
Basic diagnostics and charging check
The first step is always to check the physical condition and the charge level, and often the problem is solved by a simple cleaning of contacts, take a cotton swab slightly soaked in alcohol, and gently wipe the metal contacts on the headphones themselves and inside the charge case, even a microscopic layer of fat or dust can prevent charging.
After cleaning, place your headphones in your case and make sure the charge indicators are on fire. Note that if one of the indicators doesn't light up or flashes red, then the contact is not established or the battery is completely dead. Leave the devices to charge for at least 30-40 minutes, even if the indicator is behaving strangely.
Check the case. Make sure the case itself is charged and capable of transmitting power. Sometimes the problem is not the headphones, but the case battery that has died, which stops waking one of the modules, and if after a long charge the situation has not changed, then we go to software methods.
⚠️ Note: Do not use sharp metal objects (needles, toothpicks) to clean contacts, so as not to close the chain or damage the coating of pins.
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If you have a multimeter, check the voltage on the contacts inside the case with the lid open. It should correspond to the Li-Ion battery value (about 3.7-4.2V).
Resetting and re-pairing
The most effective way to solve the problem of desynchronization is a complete reset (Hard Reset), which causes the headphones to forget the old settings and re-find each other, restoring the Master-Slave connection. For different Xiaomi models (Mi True Wireless, Redmi Buds, AirDots), the process may be slightly different, but the overall algorithm is the same.
First, remove the Bluetooth device on your smartphone. Go to the settings, find your headset, and hit Forget or Unpair. Then turn off the Bluetooth on your phone. Now place both earbuds in the case, leaving the lid open.
Find the touch zones on both headphones (or a button on the case if the model provides one). Press and hold the sensors simultaneously for 10-20 seconds. Indicators should start flashing red and white (or only red) several times, then go out. This is a successful reset signal.
☑️ Reset algorithm TWS headphone
After reset, turn on Bluetooth on your phone and start looking for devices. Headphones should be identified as a new device. If two identical names appear on the list (for example, two "Mi True Wireless Earbuds"), then the sync did not go through, repeat the reset procedure, taking more time to hold the buttons.
Comparison of models and specificity of malfunctions
Different generations of Xiaomi headsets have their own design and software features, which affect the nature of the malfunction. Older models such as Airdots 1 and 2 often sin loss of communication due to less stable Bluetooth protocol. Newer models of the Redmi Buds series and Mi True Wireless Earphones may require firmware updates through the proprietary application.
Below is a table that helps identify typical problems depending on the series of devices and methods for their priority solution.
| Device series | Typical problem | Priority decision | nuance |
|---|---|---|---|
| Xiaomi Airdots 1/2 | Dissynchronization of channels | Repeated reset (5 consecutive times) | Sensitive to Wi-Fi interference |
| Redmi Buds 3/4 | Silence in one ear | Update via Xiaomi Earbuds app | A stable Internet is required |
| Mi True Wireless 2/2S | Low volume of one channel | Cleaning the speaker grid | They're often hammered with sulfur. |
| Gaming Edition | Sound delay or breaks | Switching to Low Latency Mode | High energy consumption |
Secret combination for Airdots
Smartphone settings and system conflicts
Sometimes the root of the evil lies not in the headset, but in the phone's operating system. Absolute volume in Android can cause sound levels to dissynchronize between devices. If one earphone is quieter than the other or not playing at all, try turning this option off.
You need to go to the developer menu. Go to Settings → About Phone and quickly click on the build number 7 times. Go back to the main settings menu, find the Additional → For Developers section. In the list, find the item “Disable Absolute Volume” and activate it, then restart the phone.
Also check the sound balance settings. In Settings → Sound and Vibration → Sound quality and effects (the path may vary depending on the MIUI or HyperOS shell), make sure that the channel balance slider is strictly centered. Shifting the slider to the left or right can create the illusion of a break in one of the speakers.
⚠️ Warning: Be careful in the "Developers" menu. Changing unknown parameters can lead to unstable operation of the entire operating system of the smartphone.
Speaker cleaning and physical maintenance
Don't ignore the banal pollution. Earwax and dust over time tightly clog the speaker grid, creating a "cotton" sound or complete silence. Visually, the mesh may seem clean, but microholes can be clogged.
To clean, use a soft toothbrush or a special sticky clay to clean the appliances. Carefully brush the net to remove plaque. You can use isopropyl alcohol to apply it to the brush, but in no case pour the liquid directly onto the earphone. The moisture inside the case is guaranteed to disable the device.
If the sound is louder after cleaning, but there is a crack, it is possible that the speaker membrane has been damaged from aggressive cleaning or moisture earlier, in which case only a replacement speaker in the service center will help.
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Regular preventive cleaning of headphone mesh every 2-3 weeks prolongs their life and maintains sound quality at the factory level.
When a service center is needed
If all of the above methods did not work, and one earphone is still silent, there is a possible hardware malfunction, it can be a failure of the battery (it stopped holding the charge and turned on), a break in the plume inside the case or the combustion of the Bluetooth module.
A particularly alarming symptom is heating one of the headphones when charging or working, as well as the lack of response to any action (light indication does not light up even after an hour in the case), in such cases, self-repair is often impossible due to the monolithic design and complex soldering of miniature components.
Contacting an authorized center is necessary if the device is under warranty. Remember that traces of opening, moisture (LCI indicators) or mechanical damage are grounds for refusing warranty service.