Modern Xiaomi Redmi smartphones have become an integral part of digital communication, providing high-quality voice transmission through instant messengers, social networks and standard calls. However, users often face a situation when the interlocutor stops hearing you, and the device itself is silent, as if it does not have an audio input, such a problem can arise suddenly after updating the system, installing a new application or even for no apparent reason, causing panic among gadget owners.
In the MIUI operating shell or the new HyperOS, a complex system of resolutions and hardware controllers is responsible for the operation of sound recording components. If you notice that the recorder does not write sound, and you can't hear you in video calls, then there has been a software logic failure or physical lockdown. Before you carry the device to the service, you should try a comprehensive diagnostics that returns functionality in 90% of cases.
This guide will help you identify and fix the problem yourself using the built-in tools. We will look at both software privacy settings and deeper system settings that are often ignored by ordinary users. Recovery of the microphone is a process that requires care, but is accessible to every smartphone owner.
Primary diagnostics and verification of hardware
The first step should always be to check the physical condition of the device, as software methods are powerless against mechanical damage. Carefully inspect the ends of your Xiaomi Redmi: the bottom hole next to the charging port and the top slot on the edge of the case should be clean. The accumulation of dust, pile from pockets or moisture can completely block the access of sound to the membrane.
There is a simple test to determine which microphone is not working: the main (bottom) or the secondary (top, for noise reduction) record a voice message in a standard voice recorder with your finger on the top hole, and then repeat the procedure by closing the bottom one. If one is recording and the other is not, then the problem is in the particular physical module or its contamination.
⚠️ Warning: Never attempt to clean microphone holes with sharp metal objects such as needles or pins.You risk damaging the inner safety net or piercing the membrane itself, leading to irreversible breakage.
Also, you should eliminate the impact of external accessories. Some protective cases, especially those that are not specifically designed for your Redmi model, can block the sound channels. Remove the case and check the sound again. If the situation has not changed, move to the software part, where most of the causes of failures in Android.
Configure permissions for applications in MIUI
The most common reason you can't be heard on WhatsApp, Telegram or Viber is because you don't have the necessary permissions. MIUI is famous for its strict privacy policy, which can by default block apps from accessing audio devices. To fix this, you need to manually check the settings of each messenger you use.
Go to your smartphone’s Settings menu and find the Apps section, and then select All Apps. In the list that opens, look for a problematic app like Skype or Instagram. Click on it to open a detailed menu, and select App Resolution. Here you will see a list of all the requested accesses, which should be Microphone.
- 🔍 Select Allow or Always Allow the app to have full access to audio recording without restrictions.
- 🚫 If it is to Prohibit or Ask, the application may not have the rights to record in the background.
- 🔄 After changing the settings, completely close the application through the Task Manager and run it again for changes.
Some versions of Xiaomi's shell have an additional Privacy Protection feature that can automatically turn off the microphone for apps that the system thinks shouldn't use it. Check this section in the security settings to make sure your messenger isn't blacklisted.This is especially true for newer versions of Android where data control is tightened.
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Use the “Allow only during use” function if you want to be sure that the app does not listen to you in the background, but still retains the functionality of calls.
Using the Engineering Menu for Testing
To test the audio subsystem in Xiaomi smartphones, there is a special engineering menu, which allows the test components to be tested without standard applications, which helps to understand whether the problem is system or hardware, accessed through a standard call.
Dial ##6484## on the dial keyboard. If the code is entered correctly, the CIT menu will open. In the test list, find items associated with the word "Mic" or "Audio." Usually there are several of them: "Main Mic" (main), "Secondary Mic" (secondary) and "Headset Mic" (headset).
##6484##When you run a test, follow the instructions on the screen: you will be asked to say a phrase or just make a sound. The system will visualize the incoming signal or play it in the speaker. If there is sound in this menu and it is recorded clearly, then everything is fine with the hardware, and you need to look for the problem in the settings of the OS or specific applications.
What if the code doesn't work?
Access management through Permit Manager
Unlike pure Android, the MIUI shell offers a centralized tool to manage the rights of all installed programs, which is convenient when you need to quickly check which applications have access to the microphone and revoke unnecessary rights. This section also helps to identify spyware or viruses that may have secretly activated the recording.
To get into this section, open the Security app (green zipper icon) that is preinstalled on all Xiaomi Redmis. On the bottom menu or tool list, find the Permissions or Permissions Manager. Here, rights are grouped by categories: geolocation, contacts, camera, and of course microphone.
| Type of access | Default status | Recommended action | Security risk |
|---|---|---|---|
| Messengers (WhatsApp, Telegram) | Ask/Allow | Allowed always | Low (necessary for work) |
| Games and utilities | Forbidden. | Banned | High (frequently collected data) |
| Voice input (Google) | Permission. | Allow only when using | Medium. |
| Unknown applications | Forbidden. | Strictly ban | critical |
Carefully review the list of apps that have access to the microphone. If you see a calculator, flashlight, or game that doesn't require voice control, immediately disable it. Such anomalies often indicate the presence of adware or malware that is using your phone's resources.
☑️ Permit security check
Resetting audio settings and calibration
If software failures caused the sound driver to malfunction, it may be necessary to reset the audio settings or recalibrate. Xiaomi smartphones do not have a single “Reset Sound” button, but there are several actions that lead to a similar result.
The first method is to clean up the system application's audio data. Go to Settings -> Apps -> All Apps. Click on the three dots in the top corner and select Show System Processes. Find in the list "Sound Settings," "Audio Effect," or a similar name. Go inside and click "Clean -> Clear everything."
The second method is sensor calibration, which sometimes affects the audio subsystem. Use the ##6484## engineering menu again. Find the Sensor or Calibration test and follow the instructions. Some Redmi models have a separate Calibrate test that resets the microphone's sensitivity to factory values.
⚠️ Warning: When calibrating, make sure the room is quiet. Extraneous noises may be recorded by the system as a reference for silence or noise, which will cause noise reduction to work incorrectly in the future.
After doing this, be sure to restart the device. Restart is necessary for the Android operating system to reinitialize the sound server and apply clean configuration files, often solving the problem of quiet or intermittent sound.
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Cleaning up system audio services data does not delete your personal files, music or volume settings, it only resets software audio processing parameters.
What to do if nothing helps
When all the software methods have been tried and the microphone on Xiaomi Redmi has not worked, the probability of hardware failure is as high as 99%, it can be a waste plume, oxidation of contacts after moisture is ingested, or failure of the board itself.
Before you go to the service, try to perform a full reset to the factory (Hard Reset). Remember that this action will delete all your data, so pre-create a backup. Even if on a clean system without installed third-party applications, the microphone is silent - this is a direct path to the master.
- 🛠 Check the warranty: if the device is warranty, any self-opening will lead to its loss.
- 💧 Waterproof: if the phone fell into the water, do not dry it with a hair dryer, and immediately carry it to the service, as corrosion may have already begun.
- 🔌 Accessory test: plug in the headset, and if it's sounding, it's the built-in module of the phone that's the problem.
Sometimes the problem is a poor-quality charger or cable that creates strong electromagnetic tips that "muffle" the weak microphone signal. Try turning off charging and check the connection. If offline everything works, replace the power supply or cable with the original or certified Xiaomi.