When the microphone on Xiaomi is not working well, it can be taken by surprise at the most inopportune moment, whether it is an important business call or a voice message recording. Users often experience people complaining about a quiet sound, extraneous noises or a complete lack of voice transmission. Owners of Redmi Note and Poco smartphones are especially often looking for ways to fix this problem, since it significantly reduces the comfort of the device.
Before you bring your gadget to the service center, you should try to perform a number of software settings and simple physical actions. In most cases, the problem lies in the software failure of MIUI or the banal contamination of the speaker hole. Below we will discuss in detail all possible causes and methods for eliminating them.
Xiaomi's modern smartphones are equipped with a sophisticated noise reduction system that sometimes doesn't work properly. Understanding how it works will help you find a solution faster. Sound calibration is the first thing to look for when strange artifacts appear in a recording.
The main causes of malfunctioning microphone
The problems with recording on Xiaomi devices can be caused by many factors, from simple to critical. Most often, users face software conflicts when the Android operating system misallocates the resources of the audio processor. Also, do not exclude physical impact: a drop in the device or moisture can damage the internal contacts of the module.
Quite often, the culprit is a protective cover or film that covers the technological opening. Even a microscopic shift of the accessory can cause the microphone to work with severe distortion. Pollution of the mesh with earwax or dust is another common cause of quiet sound.
In rare cases, the problem lies in poor build or defective components, especially if the device is new. However, before you draw conclusions about the "iron" failure, you need to exclude software errors. Updating the firmware or resetting often solves the problem without interference with the hardware.
- 📱 Shell software failure MIUI application conflict.
- 🛡️ A protective cover or glass covers the entrance opening.
- 🌫️ Pollution of the microphone mesh with dust and pile.
- 💧 Moisture entering the body or oxidation of contacts.
Software methods of sound recovery
If you're physically OK, you should start diagnosing with the software part. The first thing you need to do is check the permission settings for applications. Often, after an Android update, the system automatically disables access to the microphone for messengers like Telegram or WhatsApp. To check, go to Settings → Applications → All applications, select the right one and make sure that the Microphone slider is active.
The second important step is to check that you're in Safe Mode, and that will help you determine if a third-party application you recently installed is causing it, and if it's recovering sound in Safe Mode, it means that the conflicting software needs to be found and removed, and that driver failure is also possible, and it's often treated by simply restarting the device or resetting the network settings.
Don't ignore the availability of system updates. Xiaomi developers regularly release patches that fix audio system bugs. Check the relevance of the firmware version in the About Phone menu. Sometimes cleaning the cache of the system application "Sound" or resetting all settings to factory if the problem is global.
☑️ Checking software settings
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If the microphone doesn’t work in just one app (like a voice recorder), try installing a third-party recorder from the Play Market to check the equipment’s health.
Physical cleaning and maintenance of the device
The most common reason why the microphone works quietly on Xiaomi is the banal dirt. The microphone holes on the ends of the case constantly collect dust, pile from pockets and skin fat. Over time, this forms a dense cork that muffles the sound. Sharp objects like needles or pins are strictly forbidden to be used for cleaning, since there is a high risk of damaging the membrane.
The best solution is to use a soft antistatic brush or a special cleaning tape (cleaning gum). You can walk gently with a brush with soft bristles slightly soaked in isopropyl alcohol, but it is important not to pour the liquid inside. Ultrasonic cleaning in the service is also effective, but requires disassembly or specialized equipment.
Look at the safety glass. If you've recently changed the glass or glued the film, make sure that the master does not glue the microphone hole. Even factory films sometimes have technological cutouts that can shift with a sloppy sticker. Take off the case and check the microphone without it, perhaps the problem is in the accessory.
⚠️ Attention, never try to blow the microphone with your mouth. Exhaled air contains moisture particles that, when deposited on the membrane, can cause corrosion and permanently disable the module.
Engineering menu and sound calibration
For a deeper diagnosis, Xiaomi owners can use the engineering menu, which is a hidden part of the system that allows you to test hardware components. To get there, open the Phone app and type the combination ##6484##. In the CIT (Customer Integration Test) menu that opens, select the item associated with the microphone (usually "Main Mic" or "Sub Mic").
In the test mode, you can see the signal level in real time. Speak to the microphone and watch the scale: if it responds to voice but the sound is not transmitted in the applications, then the problem is software. If the scale does not move at all, there is a hardware defect, and you can calibrate it here, if this option is available for your model.
Some models allow you to reset your audio processor through special codes or developer menus. To access the developer menu, click 7 times on the build number in About Phone. Then, in advanced settings, look for items related to audio effects or absolute volume.
| Type of microphone | Location. | Appointment | Signs of malfunction |
|---|---|---|---|
| Main (Main) | Lower end | Talk, recorder. | The interviewee does not hear in normal mode |
| Supplementary (Sub) | Upper end | Noise suppression | The effect of the aquarium, you can hear only noise. |
| Headset microphone | In the plug/Bluetooth | Headset | The sound is only when you connect headphones |
| Camera microphone | Near the lens. | Video recording | No sound when shooting video |
Secret codes for diagnosis
Problems after upgrade or reset
After updating the MIUI or HyperOS operating system, users often notice a deterioration in communication quality, which is due to the fact that the new firmware may contain bugs or malfunction with old hardware drivers, in which case cleaning the cache partition (Wipe Cache Partition) through Recovery Mode helps, which does not delete personal data, but dumps system debris.
If you have done a full reset, make sure that you have given all the necessary permissions to the applications when you first set up. Sometimes Xiaomi's security system blocks access to the microphone for "suspicious" applications until you manually confirm trust. Check the settings of the antivirus and the security applications.
If the problem occurs after installing custom firmware or obtaining root rights, there is a high probability of conflict modules: return to the stock firmware or delete newly installed tweaks. Unstable kernel operation can also cause interruptions to the audio stream.
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If the problems started immediately after the firmware update, don’t rush to carry the phone for repair – in 80% of cases, this is a temporary bug that will be fixed in the next security patch.
When repairs are needed in the service
If neither cleaning nor software resets helped, it is likely that a replacement module will be needed, and the signs of hardware failure are: no sound recording even in the engineering menu, crackling and hissing, independent of the applications, and visible damage to the mesh or housing after a fall, in which cases self-repair can be dangerous.
Replacing the microphone is a procedure that requires precision and a special tool. In modern Xiaomi smartphones, the microphone is often soldered into the charging plume or is part of the bottom plume. To replace it, you will need to remove the back cover (if it is glass, you need a hairdryer and suction cups), turn off the battery and replace the corresponding plume.
The cost of repairs is usually low unless you need to replace the main board. However, if the phone is under warranty, it is better to contact an authorized center. Self-opening the case is guaranteed to deprive you of warranty service. Remember that oxidation of the board after moisture is ingested requires professional ultrasound cleaning, not just drying in rice.
⚠️ Attention! If the phone falls into water, turning it on to check the microphone may cause a short circuit, in which case the device should be immediately turned off and not charged before visiting the service.