When one of the wireless headphones stops making sound or broadcasting a signal, it is one of the most common problems in the world of portable acoustics. Users often face the fact that the left or right module simply does not turn on, the indicator lights up but does not transmit audio, or the devices lose sync with each other. Owners of popular models of the Xiaomi Redmi Buds series, AirDots and Xiaomi Earbuds especially often complain about such complaints on technical support forums.
The reasons for this behavior can range from a banal discharge of the battery to a complex software failure in the Bluetooth connection protocol. Often the problem lies in the oxidation of the charging contacts inside the case, which simply did not charge the silent module all this time, and do not rule out mechanical damage to the dynamic head or moisture, which requires more serious intervention.
In this article, we will discuss in detail the algorithm of actions that will help you to bring back to life the silent earphone without the need to immediately go to the service center. We will consider methods of hardware reset, features of reconnection and nuances of MIUI software that can block the correct operation of the periphery.
Diagnosis of the problem: why is one of the headphones silent
Before we take radical action, we need to pinpoint the nature of the malfunction, and users often mistakenly believe that the device is broken, whereas the problem is software-based, and desynchronization is a condition where the right and left modules stop hearing each other and are perceived by the phone as two different devices or one, but with the loss of the channel.
First, check the charger. Put both earphones in the case and make sure the lights light up. If one doesn't light up, maybe the contacts are oxidized or the battery is dead in the case itself. Try rubbing the contacts with an alcohol napkin.
⚠️ Attention: If the headphone has been in water or is severely impacted, self-disassembly can lead to complete failure.
It's also worth checking the sound balance in your smartphone settings. Sometimes a software failure shifts the balance completely to one side, creating the illusion of a second channel breakdown. Make sure that in Settings → Sound and vibration, the balance slider is in the center.
Complete Reset (Hard Reset)
The most effective way to fix software errors and desynchronization is to reset the headset completely, which forcefully erases the memory of previous connections and repairs the left and right modules between each other. The Redmi AirDots and Xiaomi Buds models may have a slightly different algorithm, but the principle is the same.
Usually, the process is this: place both earbuds in the charge case, make sure they charge. Then find the function button on the case case (if any) or use the touch zones on the headphones themselves. Press the button or sensors for 10-20 seconds before changing the color of the indicator.
☑️ Reset algorithm TWS headphone
Once the indicators flash (often in white or orange), the headset will go into pairing mode. Now remove the old device from the Bluetooth list on the phone and search again. It is important to do pairing again, as old encryption keys can conflict with new settings.
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After reset, be sure to remove the headphone profile from the phone's Bluetooth menu before reconnecting, otherwise the settings conflict may recur.
Charging problems and contact oxidation
A common reason the second headphone doesn't work is that it's got a simple lack of charge in its battery, and the micro-contacts that transmit energy are very small and susceptible to oxidation from sweat or air moisture, and even the thinnest film of oxide can interrupt the charging circuit.
To clean, use a cotton swab slightly soaked in isopropyl alcohol. Gently wipe the contacts on the earpiece itself and the pins inside the case. Let the alcohol evaporate completely before you put the earpiece back in. Also check if the earpiece sits tight in the socket - sometimes light swaying or pinching your finger while charging helps.
| Symptoms. | Possible cause | Method of decision |
|---|---|---|
| The indicator is not on. | Oxidation of contacts | Cleaning with alcohol, dry eraser |
| The indicator flashes red. | Critical discharge | Leave in the case for 30-60 minutes |
| The earphone falls out of the case | Mechanical damage | Finger-fixing, case replacement |
| Charging only in a certain position | Magnet shifting | Careful indentation before clicking |
| No reaction. | Battery death | Replacement of the power supply (requires rations) |
If the headphone still shows no signs of life after cleaning and charging for more than an hour, the power controller or the lithium-ion battery itself may have failed. In cheap models, replacing the battery is not economically feasible.
Bluetooth Interference and Program Conflicts
Modern air is oversaturated with Wi-Fi signals from routers, microwave ovens and other Bluetooth devices, which can cause interference, which causes communication with one of the channels (usually one that is not a master device) to be cut off. TWS-headsets are sensitive to interference.
Try to move away from the router or turn off other Bluetooth devices nearby for a while. It is also worth checking if the Bluetooth cache in your smartphone is overloaded. In Android, this can be done through the developer menu or special applications to clean the system cache.
What is a master device in TWS?
Some users note that the problem is solved by resetting the network settings on the smartphone.This action will delete all stored Wi-Fi passwords and Bluetooth keys, but often eliminates deep system errors of the communication stack. Go to Settings → Connection and Sharing → Reset Wi-Fi, cellular networks and Bluetooth.
Updating the firmware and working with the application
Electronics manufacturers regularly release microcode updates (firmware) that fix connection errors and improve stability. For Xiaomi and Redmi headphones, the main management tool is the Xiaomi Earbuds app or the built-in module in MIUI.
Go to the app and check for updates. If the firmware version is outdated, one of the headphones may not work properly due to bugs in the sync protocol. The update process is critical: put the headphones in the case, open the lid next to the phone and do not interrupt the process until you reach 100%.
⚠️ Warning: During firmware updates, you should not close the application or take the phone away from the case.
If the automatic update doesn’t come, you can try resetting the app’s settings in the Android menu (Settings → Apps → Xiaomi Earbuds → Memory → Clear data) and this will force the system to re-interview the device and offer the latest version of the software.
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The lack of firmware updates is a common reason for channel desynchronization in new batches of headphones.
Mechanical damage and battery wear
If software and cleaning the contacts didn't help, it's probably hardware. Lithium batteries in compact headphones are small in volume and are prone to rapid degradation. If the device is over 2-3 years old, the capacity could have dropped to zero, and the earphone simply doesn't hold the charge.
There are also possible internal plume breaks due to a fall, which requires disassembly of the hull. TWS-headphones are assembled on glue without the use of screws, which makes their disassembly extremely difficult and often impossible without damage to the body.
A sign of failure of the speaker is the presence of cod, wheezing or complete absence of sound even when connected via wire (if the model allows) or when tested through another source, in which case repair is possible only in a specialized service, where the dynamic head or board will be replaced.