Many users are faced with a situation where the favorite Xiaomi Earbuds or a wired headset suddenly stop playing sound in one of the channels. Before you carry the device to the service or buy a new one, it is worth conducting an initial diagnosis. The vertebra procedure allows you to determine the integrity of the internal circuits and precisely localize the cliff site, this is especially true for models with active noise cancellation, where electronics are more complex.
To do a good test, you'll need a basic set of tools, including a multimeter and soldering equipment, if you need to replace components. In this article, we'll go into detail on the algorithms for wired and wireless models. You'll learn to distinguish between software failures and hardware damage to speakers.
Tools and workplace preparation required
The quality of the diagnostics depends on the equipment used. The basic appliance for the electrician is a multimeter, configured in the mode of measuring resistance (OM) or vertebrae. For wireless models of Redmi Buds, you may need to disassemble the body, so stock up on thin plastic blades.
Organize your workspace so that you don't lose any small parts. Use a magnetic mat or screw containers. The light should be bright and directional so you can see the markings on the board and the status of the contacts.
- 🔧 Digital multimeter with vertebrae mode.
- 🛠 Precision screwdrivers and mediators for opening.
- 🔍 Loop or magnifying glass for inspection of soldering.
- 🧹 Isopropyl alcohol and soft brush for cleaning contacts.
⚠️ Warning: Before starting any work with wireless headphones, be sure to completely discharge the battery, if possible, or disconnect its plume from the board immediately after opening the case.
Do not use rusty or oxidized probes, as they can give false resistance readings.If you are working with wired models, make sure that the plug 3.5 mm clean. TWS-It is critically important not to damage thin plumes during disassembly.
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Use a multimeter with an audio indication – this will allow you to focus on contacts without being distracted constantly on the device screen.
Diagnostics of wired headsets Xiaomi
Wired models like the Mi In-Ear Headphones Pro are most likely to suffer a wire fracture at the plug or at the speaker itself, and to ring them, you need to remove the back cover of the earpiece by gently putting a blade on it, and inside you'll see two main contacts going to the speaker.
Put the multimeter in resistance mode. The normal resistance of the speakers is usually 16 to 32 Ohms. If the instrument shows one or infinity, then the circuit is broken. If it shows zero, the coil shorts.
☑️ Checking the wired headset
Pay special attention to the microphone and the control button. They often fail due to moisture. Check for oxides on the control board. Contacts should be shiny and clean. If you find green plaque, treat the board with alcohol.
Sometimes the problem is not the dynamics, but the soldering point of the wire to the board, and if you move the wire lightly with the multimeter connected, you can see the floating contact, and then you have to re-sweeten the connection using flux and solder.
Verification TWS-models and internal dynamics
Xiaomi FlipBuds or Redmi AirDots are more complicated. There are no wires as we know them, but there are thin tracks on the board and soldering directly to the dynamic head. TWS speakers often require the soldering of one of the contacts to eliminate the impact of the gain circuit.
Carefully remove the speaker from the housing. Connect the multimeter probes to the speaker's terminals. If you hear a characteristic crack or see a change in resistance, the speaker is in good order. The lack of response indicates a break inside the coil.
The secret of quiet sound
The table below shows the typical resistance values for the various components:
| Component | Normal resistance | Sign of malfunction |
|---|---|---|
| Dynamic (driver) | 16-32 Ohm | Infinity (cliff) |
| Microphone | 1 - 2 kom | Short circuit (0 Ohms) |
| Battery | 3.7. to 4.2 B | Voltage below 3.0 V |
| Charging contacts | 0 Ohms (conductivity) | Oxidation, no contact. |
Remember that some speaker models may have lower resistance, around 8 ohms, but for Xiaomi’s miniature electronics, the standards are higher.
Analysis of plumes and contact groups
In modern times TWS-In headphones, the connection between the main board and the speaker is often through a flexible plume, which is extremely sensitive to mechanical stress.
Set the multimeter in vertebrae mode. One probe at the beginning of the track (at the connector), the second at the end (at the speaker), the sound signal will confirm the integrity. If there is no signal, the track is interrupted or oxidized.
- 🔍 Visually inspect the plume for the presence of microcracks.
- 🧪 Check the connectors for moisture and corrosion.
- 🔌 Make sure the connectors sit tightly in the grooves.
- 🛠 Carefully clean the contacts with a swallow or alcohol.
⚠️ Attention: Flexible plumes are very easy to break when handled carelessly. Do not pull them with force and do not use metal tools to lift.
Often, there is a contact that is unstable, and it can be caused by a deformation of the connector, which requires careful tweezing of the contacts under magnification, and if the plume is physically damaged, it must be replaced with an original or compatible analog.
Software diagnostics and resetting settings
Before you disassemble the device, you should rule out software failure. Sometimes Mi True Wireless headphones can "glut" by losing communication between the channels, in which case a physical vertebra will not help, you need a software reset.
For most Xiaomi models, you need to put headphones in a case, press the touch buttons for 10-15 seconds before changing the display. This will return the factory settings. It is also worth checking the firmware update through the Mi Home app or Xiaomi Earbuds.
If one earphone is still silent after reset and the multimeter shows a break on the speaker, then the problem is hardware. Software methods will not restore the burned coil or the broken wire.
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If the multimeter shows normal resistance but no sound, check the sound source on another device to rule out problems with the smartphone.
Frequent mistakes in self-repair
Beginners often make mistakes that lead to a device breaking down permanently, most commonly using excessive force to open the case, and Xiaomi’s glue requires careful heating or cutting, but not jerking.
Another mistake is to use the wrong solder, and for small electronics, you need a solder with flux inside and a thin sting of a soldering iron, and overheating the speaker with a soldering iron can lead to detachment of the membrane and wheezing.
And remember, static electricity. Electrostatic discharge can disable a charge controller or Bluetooth module, run on an antistatic mat, or at least touch a grounded object before touching the board.
Replacement of components and final assembly
If the vertebrae confirms that the speaker is malfunctioning, it needs to be replaced. It's difficult to find original components, so often donors or compatible analogs are used, the main thing is the coincidence of size and resistance.
When soldering new wires, observe polarity. Mixed plus and minus will lead to antiphase, and the sound will be flat and quiet. After soldering, be sure to check the device with a multimeter again before assembly.
When assembling the case, use a minimum amount of glue or double-sided tape, which will allow the headphones to be reopened for cleaning or repair in the future. Make sure that all the plumes are snapped before the characteristic click.