Why the microphone in the Xiaomi Redmi phone doesn’t work

When the microphone on the Xiaomi Redmi smartphone suddenly stops working, it can be taken by surprise at the most inopportune moment. The interlocutor stops hearing you, the voice recorder is silent, and voice input becomes a useless feature. Owners of Redmi Note line devices and budget models of the Redmi series often face this problem, and you should not panic in this situation. In most cases, the reason lies in a software conflict or banal locking with accessories.

Modern Android smartphones are complex multimedia devices, where the transmission of sound is not one, but several microphones. the main module for conversations, an additional one for noise reduction and a third for recording video – all of them require the correct operation of the operating system MIUI or HyperOS. If one of the channels fails, the system can automatically switch to a backup, but sometimes there is a complete failure of the audio subsystem.

A thorough diagnosis is required before you bring your device to the service center. Often, users overlook simple factors, such as the protective film covering the microphone hole, or a recent firmware update that contains bugs. In this article, we will detail the software and hardware reasons for your device’s silence and suggest effective solutions.

Software failures and system restart

The most common reason why the microphone on Xiaomi phone doesn’t work is a temporary operating system failure. Android’s audio processing process can freeze or fail, especially if you installed new apps or changed system settings just before the problem occurred.

A simple reboot of the device often helps to reset the cache of system services and restore the normal operation of audio drivers. Don't ignore this step, as it eliminates up to 60% of software glitches. If the problem persists after turning on, you should pay attention to the mode of operation of the phone.

⚠️ Note: If you use Do Not Disturb or Airplane mode, some microphone features may be limited to system privacy settings, even if the module itself is in good working order.

It's also worth checking if USB debugging mode or other engineering settings that may have been accidentally changed are activated.Returning to factory settings often helps if a failure occurred after a failed experiment with Developer Options.

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Rebooting a smartphone is not just a screen switch, but a complete recheck of all system processes, including audio modules.

Application conflicts and permission settings

MIUI has a strict security policy that requires explicit permission to access the microphone, and if you upgrade an app like Viber, Telegram or WhatsApp, it may lose the rights to record the sound, in which case the microphone is running on the system, but the specific program cannot "see" it.

To check, you need to go to the settings and find the Applications section, and you should select the problem application and check the Permissions item. Make sure the switch opposite the Microphone is activated. Sometimes the Android system automatically disables access to sensitive data after the security update.

• 🔍 Go to Settings. → Annexes → All applications.
• 📱 Find an application that doesn’t have sound (such as a voice recorder or messenger).
• 🎙️ Select "Application Permissions" and set the "Allow" value».
• 🔄 Restart the application and check the sound.

There is also a possibility of a third-party conflict: If you installed applications to record calls, improve sound or "cleaners" of memory, they could intercept the control of the audio input. Try to remove the newly installed software and check if the problem has disappeared.

Effects of Accessories and Physical Blocking

Often the reason the microphone doesn't work is trivial and lies in the look of the device.Secure windows, covers and stickers can overlap the process holes. In Redmi Note models, the bottom microphone is often located next to the charging connector, and a tight case can easily close it.

And then, over time, the microphones accumulate dust, pile and dirt, which creates a physical barrier to the sound wave, and even if the speaker is working normally, the inlet can be clogged, and a gentle brush can do wonders.

Don't forget about Bluetooth headsets. If the phone is connected to wireless headphones lying in the bag, the sound will go there, not to the main microphone of the smartphone. Turn off Bluetooth in the notification curtain and check the audio recording again.

Diagnostics through engineering menu and tests

To accurately determine the malfunction in Xiaomi smartphones, there is a built-in diagnostic tool that allows you to check the operation of each microphone separately, which helps you to understand whether a particular module has broken or the problem is systemic in nature.

To run the test, open the Phone app and enter the code ##6484##. The CIT menu will open. Find the "Main Mic" or "Sub Mic" option on the list. Click on it and talk to the bottom of the phone.

If you see how the volume scale responds to your voice, then the hardware is fine, and you need to look for the cause in the software, and if the scale is standing still or shows static noise, there's a possibility of hardware failure.

It is important to note that in some regions the codes may differ. If the combination does not work, try going through Settings → About Phone → The kernel version (multiple tap) to get into the test menu.

Problems after updating the MIUI firmware

Users often complain that the microphone stopped working immediately after the MIUI update or the transition to HyperOS. This may be due to errors in the new version of the operating system or incorrect installation of updates, in which cases cleaning the cache partition helps.

Sometimes the problem is solved by resetting all settings to factory. Before that, be sure to back up the data to the Mi Cloud cloud or to your computer. Reset will delete all user data, but return the system files to their original state.

If that doesn’t work, you may need to flash the device through your computer using the Mi Flash Tool, a more complex process that requires unlocking the bootloader and should only be done by experienced users or in a service center.

⚠️ Warning: Hard Reset will completely delete all your photos, contacts and apps. Make sure you have an up-to-date copy of the data.

Hardware malfunctions and repairs

If software methods fail, there is likely to be a physical breakdown: In Xiaomi Redmi smartphones, microphones are small boards soldered to the main module or connected by a plume, and are sensitive to bumps, falls and, most importantly, moisture.

Water, even in small amounts (rain, steam in the bathroom), can cause the microphone contacts to oxidize, in which case the device may stop hearing the interlocutor or the sound will become quiet and intermittent. Sometimes drying in silica gel helps, but it is better not to take risks and consult specialists.

Also common is the plume's drifting away after a fall, the internal components shift and the contact disappears, and repairs are usually inexpensive, and involve reconnecting the plume or replacing the module.

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Use the Sound Removal feature in your audio settings (if available in your MIUI version) to try software-enhanced microphone sensitivity before going for repairs.

Frequently Asked Questions (FAQ)