When someone stops hearing you or the sound gets intermittent, it can take you by surprise at the most inopportune moment. There are several effective ways for Xiaomi smartphone owners to quickly diagnose the problem. Most often, the failure is software-based and easily fixed without going to the service center. Understanding how your device's audio codec works will allow you to independently identify the cause of the malfunction.
In this article, we will take a look at all the available testing methods, from simple calls to the use of hidden engineering codes. You do not need special expensive equipment. You just need to know the sequence of actions in the MIUI or HyperOS interface. Proper diagnosis will help determine whether a particular microphone module is to blame or the problem is in the software.
Before you start to do complex manipulations, you should rule out the trivial physical factors. The cover can block the hole, and the protective film can clog the speaker grid. Also make sure that the connectors do not get moisture or dust. If external factors are excluded, proceed to software testing.
Basic verification through system applications
The easiest and most affordable way to do initial diagnostics is to use a built-in voice recorder. Xiaomi smartphones have a Dictophone app that lets you record the sound from the main and secondary microphones, run it and record it briefly in silence and then in a noisy room, which will help you assess the sensitivity of the sensors.
Pay attention to the quality of the recording playback through the headphones and speaker. If you hear extraneous noises, cracks or jamming on the recordings, the problem may be due to a software failure of the noise reduction system. In some cases, a simple reboot of the device that resets temporary audio buffers helps.
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Before testing, be sure to wipe the area of the main microphone (usually at the bottom) and the noise-cancelling (back or top) with a soft dry cloth.
For more accurate analysis, you can use a high-quality recording mode if it is available in the application settings. Compare the volume of voice when talking in normal mode and when talking with hands-free. The difference in signal level will help you to understand which microphone input is not working correctly.
Diagnostics through CIT Engineering Menu
In the Android operating system that runs the MIUI shell, there is a hidden section for testing equipment, which is often used by engineers in the factory, but is also available to ordinary users. To get there, open the Phone app and type in a special code. For most Xiaomi models, this is a combination of ##6484##.
Once you enter the code, the CIT (Customer Integration Test) menu will open, and you will see a list of all the components of your smartphone, find the item associated with the microphone (often called Main Mic, Sub Mic, or simply Microphone), select the test you want, and follow the instructions on the screen, and the system will usually ask you to say a phrase, and then show the level of the incoming signal in decibels.
☑️ Checking in CIT menu
Importantly, this mode displays a raw signal, without software processing, if the graph jumps or the line is straight, it may indicate a hardware malfunction, and you can also check the noise cancellation by covering the secondary microphone with your hand while recording.
⚠️ Warning: Do not change the settings in other sections of the engineering menu unless you are sure of their purpose.Resetting the screen calibration or touch screen without special equipment can lead to malfunction of the device.
Using third-party applications for sound analysis
If the built-in tools aren't enough, Google Play comes to the rescue, and apps like Sound Meter and Microphone Test allow you to visualize the sound wave in real time, and they're useful for detecting quiet noise that you can't hear in the ear, but that interfere with conversation.
Run the app you select and hold your phone to the sound source. Pay attention to the volume scale. Abrupt jumps or dead zones on the graph may indicate problems with the digital signal processor. Some programs allow you to record sound from different microphones separately, which makes it easier to localize the breakdown.
There are also frequency-checking tools that play different frequencies and record microphone responses, and this is a professional approach that helps detect body resonance frequencies or membrane defects.
When using third-party software, be sure to check the permissions. The application must have access to the microphone, otherwise the test will fail. In modern versions of Android, this security requirement is controlled very strictly.
Comparative table of diagnostic methods
To make it easier for you to choose the right way to test, we have prepared a summary table that will help you assess the effectiveness of each method depending on your situation and level of technical knowledge.
| Method of verification | Difficulty | precision | Necessary rights |
|---|---|---|---|
| Dictaphone | Low. | Medium | No. |
| Engineering Menu (CIT) | Medium | Tall. | No. |
| Third-party annexes | Medium | Tall. | Access to the microphone |
| Calling another number | Low. | Low. | No. |
As you can see from the table, the engineering menu provides the most detailed data without installing additional software. However, a conventional voice recorder is enough for quick field checks, and the choice of method depends on how deep the analysis you need.
If you plan to regularly monitor the state of audio components, it makes sense to install one universal application, which will allow you to track the dynamics of changes in sound quality over time and notice the deterioration of performance in the early stages.
Verification of noise reduction
Xiaomi smartphones today are equipped with an active noise cancellation system that uses two or more microphones, one of which (main) records your voice, and the second (noise suppression) captures background noise. Digital processing algorithms subtract background noise from the main signal.
To test this feature, find a quiet place and record your voice on a voice recorder. Then go to a noisy place (for example, turn on a fan or TV) and make another recording. If the system is working properly, the second recording should hear the voice clearly, and the background hum should be muted.
What to do if noise reduction does not work?
A common problem is clogging the second microphone with dust or moisture, in which case the system may mistake the voice for noise and try to suppress it, causing the person to hear you intermittently or with a gurgle, and regular cleaning of the holes helps to avoid such situations.
In some Xiaomi models, noise reduction adjustment is available on the engineering menu or through special audio plugins, but for most users, there are enough regular algorithms that automatically adapt to the environment.
Analysis of the microphone in messengers
Special attention should be paid to the microphone in video communication applications such as Telegram, WhatsApp or Zoom. These programs use their codecs and compression algorithms, which can conflict with the system settings of MIUI. If the voice recorder sound is good and the messenger — bad, look for the reason in the settings of the application.
Check permissions. In Settings → Applications → Application Management, find the right messenger and make sure that the microphone is allowed. Sometimes the system mistakenly blocks access or restricts its background operation, which leads to failures when incoming calls.
It's also worth checking your power saving settings. Aggressive charge saving mode can limit the microphone's performance in the background. Add important messengers to the exclusion list to ensure stable communication at all times.
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If the microphone doesn’t work in just one app, the problem almost always lies in its settings or version conflict, not the hardware of the smartphone.
Don’t forget to update apps. Developers regularly release patches to fix compatibility bugs with new versions of Android. An outdated version of the app may not work properly with new audio drivers.
Frequent problems and ways to solve them
One of the common problems is quiet sound when talking, which can be caused by software volume restriction or physical contamination, try to turn up the volume when you talk with the adjustment buttons, and if that doesn't work, check if you're activating "Only Vibration" or "Do Not Disturb" mode.
Another common issue is echoes when you talk, which occur when the sound from the speaker hits the microphone, turn down the speaker, or use a headset, and in some cases, the echo is caused by poor communication quality in the operator or interlocutor, not a malfunction in your Xiaomi.
If the microphone is completely silent, check if the Bluetooth headset is connected. The phone could automatically switch the output to the Nearby device. Turn off Bluetooth and check the sound again. It's also worth checking if there's a third-party equalizer installed that could change the channel balance.
⚠️ Warning: If after all the checks, the microphone doesn't work, don't try to disassemble the phone yourself unless you have experience.The internal plumes of the microphones are very thin and easily damaged when a sloppy opening is done.
In difficult cases, when software methods do not work, you may need to reset to factory settings. Before that, make sure to back up the data, this will eliminate the influence of third-party applications and return the system audio settings to the original state.