Smartphone recording problems are always a nasty surprise that can take you by surprise at the most inopportune moment: When someone stops hearing you during an important call or records only a quiet hiss instead of a voice, you have to urgently look for the cause of the malfunction. Owners of Xiaomi and Redmi devices often face the need to quickly diagnose the audio system to determine whether the hardware is to blame or the software malfunction.
Modern smartphones have multiple microphones: a primary one for noise reduction and a headset for hands-free communication. Diagnostics of the microphone reveals which module is out of order or not working correctly. In this article, we will look at all the available methods of verification, from simple built-in tools to professional engineering tests available in the MIUI shell.
Before you take your device to the service center, you should rule out software errors. Often the problem is solved by simply rebooting or resetting application settings, but you need to know exactly what exactly is not working correctly. On Xiaomi Redmi devices, you often see a software failure of the sound driver after a system update, which is not a physical failure. Let's break down the step-by-step algorithm of actions for accurate diagnosis.
Initial visual and physical inspection of the device
Any diagnostics should always be started with the most obvious external inspection. Dirt, dust or protective film can banally block the microphone hole, distorting the sound beyond recognition. Carefully examine the lower end of the smartphone, where the main module is usually located, and the upper part of the body near the camera or speaker, where the additional microphone for the noise reduction system is located.
Notice the condition of the cover. Some of the defective accessories can shift during operation and overlap the process holes. If you notice a tight fit of the material to the microphone area, remove the cover and do a second test, and check whether the microphone net is clogged with pile from your pocket or dust that can be neatly removed with a soft brush.
- 🔍 Inspect microphone holes in bright light for visible contamination or damage to the mesh.
- 📱 Remove the protective case and check if it does not cover the technological necklines of the case.
- 🧹 Carefully clean the holes with a soft dry brush, avoiding the use of sharp objects.
- 🌡️ Make sure that the device does not get moisture, which could cause oxidation of contacts.
If no visual defects are detected, go to software methods of checking. It is important to understand that physical damage to the microphone membrane (for example, after a fall) is not always visible to the eye, but will immediately manifest in tests. The physical integrity of the components is the first factor that affects the quality of sound capture.
Testing through a built-in dictaphone
The easiest and most affordable way to check the microphone on Xiaomi is to use the standard Dictophone application, which does not require additional software installation and allows you to quickly assess the quality of the recording in different use cases. Launch the application through the Tools → Recorder menu and press the recording button.
Speak in a calm voice, then whisper, and make a slight noise around you (such as rubbing your fingers with a fabric next to the microphone) to help you understand how well it handles sounds of different volumes and frequencies. After you finish recording, listen to the file through different sources: built-in speaker, headphones and an external speaker.
When listening, pay attention to the presence of extraneous noise, crackle, or static hum. If the recording sounds deaf or intermittent, perhaps the problem lies in the software filters of noise reduction or in the module itself. MIUI has aggressive sound processing algorithms that can sometimes cut frequencies, making the voice robotic.
For more accurate diagnosis, try recording the sound in different modes of operation of the phone. Turn on "No Sound" or "Vibration" mode to exclude the effect of system sounds on the recording. Also check whether the antivirus or the application to optimize the access of the recorder to the microphone.
The most accurate tool for Android owners is the engineering menu. On Xiaomi and Redmi smartphones, access to it is often limited, but you can check the basic functions through a special code. Open the Phone app and type in the combination ##6484#. If the code does not work, your firmware version may block this access, and then you will have to use the MIUI Tester application from the GetApps store.
In the engineering menu, select "Test" or "CIT" (Customer Integration Test). Find the option "Main Mic" or "Headset Mic" in the list. When you select the test, the system will ask you to say a phrase, and if the microphone is good, you will see a visualization of the sound wave or hear your voice in real time through the speaker.
What if the code doesn't work?
If ##6484## does not open the menu, try downloading the official app. MIUI Tester from the built-in GetApps store. In some regions, access to the engineering menu via dialing is blocked by the operator or firmware, so the app is an official diagnostic workaround. It's important to check each microphone separately. The main microphone is usually responsible for recording video and normal conversations, and the upper (additional) microphone is responsible for noise cancellation and speaker communication. If you hear yourself clearly in the Main Mic test, and there is silence in the Sub Mic, then the upper module is defective or disabled by software. 📞 Dial the code ##6484## in the Phone app to log into the engineering menu. 🧪 Select Main Mic to check the main microphone and say the test phrase. 🔊 Check the Receiver or Top Mic for the diagnosis of the upper noise reduction module. 📉 And you can see the signal level graph, and it has to respond to voice, and the engineering menu also allows you to see technical parameters, like the sensitivity level in decibels. If the graph jumps chaotically even in silence, it could indicate electrical interference or a malfunction of the power controller, which is also responsible for supplying voltage to the audio modules. If the built-in tools don’t give the full picture, third-party apps come to the rescue. Video services such as Skype, Viber or Telegram use their own codecs and sound processing algorithms, which may differ from the system. Try recording a voice message in a messenger, which simulates real-world usage. There are specialized hardware testing tools, such as Phone Tester or Test Your Android. These apps provide detailed information about the status of all sensors, including microphones, and they show not only the signal but also its frequency characteristics, which is useful for advanced users. Go to Settings. → Annexes → All applications → [Your appendix] → Permissions and make sure that the microphone is allowed. Often users forget to give permission after reinstalling the program, which gives the illusion of failure. Compare the test results in different applications. If the voice recorder is clear and you can’t hear you on WhatsApp, the problem is the settings of a particular application or its conflict with the system, in which case cleaning the cache of the problematic application or reinstalling it will help. Xiaomi smartphones use different microphones depending on the use case. Understanding this logic helps to localize the problem. Below is a table that will help you determine which module to test in your case. Working mode Used microphone Location Typical problem Normal call Lower (main) Lower (main) End Interlocutor does not hear or hear quietly Loud Upper (additional) Upper end/camera Strong echo or noise Video Recording Both microphones (stereo) Lower and Upper Uneven sound, skewed into one channel Headset (wired) Headset microphone 3.5 mm connector / USB-C No sound with connected headphones Particular attention should be paid to the hands-free mode. In this mode, noise cancellation works most actively, using both microphones to extract the user's voice from the surrounding noise, and if you hear well on a regular call, and on speakerphone, you don't, most likely, the upper microphone is defective or the calibration of the sound emitter is lost. Also check the microphone with a Bluetooth headset connected. If there is sound through the phone's speaker and no audio through the headphones, the problem may be in the Bluetooth profile or the headset itself. Try switching the sound source during a conversation to make sure the chain switching is working properly. 📊 What is your problem with sound?I can't hear at all?Audience is very quietAudience is very quietA lot of extraneous noiseSound is interruptedNo problems, check prophylactic Software failures and permissions setting Often the reason lies not in the "hardware", but in the software conflict. Shell MIUI It has a strict permission management and power saving system. If the app you use for calls was "optimized" by the system, it could lose access to the microphone to save battery life. Check the power saving settings for important applications. Go to Settings → Battery and productivity → App management. Find a messenger or phone book and set a "No Limits" mode to prevent the microphone from being turned off by the background processes of the system. ⚠️ Note: After major Android updates or MIUI And you can reset your privacy settings. Make sure you check the permissions for all audio-based applications manually, even if everything worked before. Another reason could be the conflict of audio drivers. To do this, press the switch off button, and when the menu appears, press and hold the "Switch off" option until the suggestion to go to Safe Mode appears. If this mode is perfect, then the microphone is in conflict with the microphone drivers. In some cases, resetting the audio settings helps. Go to Settings → Sound and vibration → Sound quality and effects (the path may differ depending on the model) and try to turn off all improvements, such as Mi Sound Enhancer or equalizer. Sometimes these functions conflict with the microphone drivers. When repairs are needed, if hardware breakdowns are possible, go to the devices, if the hardware malfunctions of the devices, the physical process of the two applications, especially if the microbehatting, or the physical tests show a more severe malfunction in the microprocess, or the microbehazard test. There are clear signs that a component needs to be replaced, and if the microphone only starts working after a strong tap on the body or pressure on a certain area, this is a sure sign of contact failure or soldering disruption. 💡If the graph in the engineering menu shows complete silence (straight line) when talking loudly right at the microphone hole, the module is likely dead and needs to be replaced. Even if the device is protected from water, the leakiness is broken over time, and the internal oxidation of the microphone contacts leads to the appearance of cod, which eventually becomes complete silence. ⚠️ Warning: Do not try to blow the microphone with compressed air under high pressure. This can damage the thin membrane inside the module, turning the recoverable software failure into an irreversible physical failure. If a hardware problem is confirmed, the best solution is to contact a Xiaomi authorized service center. Replacing the microphone is a procedure that is inexpensive and fast, but requires special tools to open the case and solder the component on the board. Frequently Asked Questions (FAQ) Why am I not heard only on WhatsApp, and in normal calls everything is normal? This indicates a conflict of a particular application with the system or incorrect permission settings. Check whether WhatsApp has access to the microphone in the microphone settings, also try to improve the problem of the installation of the application. Can you programmatically increase the sensitivity of the microphone on Xiaomi? There is no such option in the standard MIUI settings. However, in the engineering menu (Audio section), you can sometimes find settings (amplifications), but changing them without knowing it is not recommended - this can lead to severe noise and distortion. It is better to use external applications to record with a gain setting if the standard level is really not enough. What to do if the microphone wheezes after a phone drop? Wheep after a fall is almost always a physical damage to the membrane or a plume. Software methods here will not help. You need to disassemble the device and check the connection of the microphone to connect the microphone to the micle, if the micle is not required for the micular lock, or the mic lock lock. Yes, if the safety glass is poor quality and has a perforation that does not match the holes on the body, it can jam the sound or create a resonance. Make sure the cutouts on the safety glass exactly match the microphones on your Redmi model.