Why Zoom Without Sound on Xiaomi Phone: The Complete Guide

When a sound suddenly disappears during a major video conference in Zoom on a Xiaomi smartphone, you can panic anyone. You see colleagues talking on the screen, but there is no rustle from the speakers, or worse, you are not heard by the meeting participants. This problem often lies not in the malfunction of the device itself, but in the finer settings of the MIUI or HyperOS operating system, which aggressively optimize the work of background processes.

Owners of Redmi and POCO devices face this more often than others because of specific energy saving algorithms that can mistakenly “muffle” a video communication application. Permission conflict, a Bluetooth headset malfunction or a banal error in the code of the application itself are just the tip of the iceberg of possible causes. Understanding the nature of the failure is already half the way to its successful elimination without going to the service center.

In this article, we will take a look at all the possible scenarios for why Zoom can work without sound, and provide step-by-step instructions for restoring audio, and we will cover both software settings and hidden system features that are not known to all users.

⚠️ Warning: Before starting complex manipulations, make sure that the problem is not related to physical damage to the speakers or moisture, as in such cases, software methods will be useless.

Basic diagnostics of hardware and connections

The first thing to do is to rule out the basic physical reasons that are often overlooked in a hurry. If your Xiaomi phone has a Bluetooth headset, smartwatch or speaker connected to it, the system could automatically switch the output to them. Check the status of the connection in the notification curtain and, if the accessory is far or off, force the connection to be severed via the Bluetooth menu.

You also need to look at a protective film or case that can overlap the microphone or speaker. Dirt, dust and pile, clogged into the mesh of a speaker, can completely drown out the sound. Clean the holes carefully with a soft brush. Sometimes it helps to banal reboot the device, which resets the temporary errors of the audio drivers.

Check the physical volume button. Make sure the media slider (not ring!) is raised to an acceptable level just when the app is running. Android has a split of sound streams, and a quiet ringtone does not guarantee volume in Zoom.

Configure permissions for the Zoom application in MIUI

One of the most common reasons Zoom works without sound on Xiaomi is the lack of necessary permissions.The default MIUI security system can block the application from accessing the microphone or audio devices, especially after a firmware update.

Go to Settings, then select Apps and find All Apps. Go to Zoom and go to Application Permissions. It's critical that Microphone and Sound Recording be allowed. If it's "Forbidden" or "Always Ask," change it to "Allowed."

In addition, newer versions of the shell have a separate tab to control access to the clipboard and other sensitive data, make sure that the application is not limited in background activity, otherwise, when the windows are rolled up, the sound may disappear.

It is also worth checking the notification settings for the app. While this seems unobvious, sometimes system bugs link the audio notification feeds to the media channel. Go to Notifications inside the app menu and make sure all categories are active.

Energy saving and background processes management

Aggressive battery optimization is a scourge of modern Xiaomi smartphones. The system can kill the Zoom process or limit its access to CPU resources to save power, leading to audio and video out-of-synchronization or no sound. To avoid this, you need to exclude the application from the optimization lists.

Open the Safety app (green lightning icon), go to Battery or Energy Saving. Find the Permission or Auto Start. In the application list, find Zoom and set the switch to the On position, which will allow the application to start with the system and run steadily.

Next, in the same battery settings menu, find Background Activity Limitation (or Background Energy Savings). For Zoom, select No Limits mode. This is a critical step, as the standard mode can interrupt the audio stream when the smartphone screen goes out or you switch to another window.

It is also worth turning off the “Full Optimization” mode in the developer settings if it is activated, although for ordinary users, the settings in the “Security” menu are sufficient.

Specific sound settings inside the Zoom app

If the system settings are in order, the problem may lie in the application itself. Zoom has its own noise suppression algorithms, which on some Xiaomi models work incorrectly, perceiving the user's voice as background noise and completely drowning it out.

When you log into a conference or profile settings, look for the Audio section. There should be an Original Sound button. Try switching it to the On state. This will turn off the sound processing by the noise reduction algorithms and can return the voice.

Also check if the output and input device is correctly selected. In the audio settings, click on the name of the current speaker/microphone. The system will offer a list of available devices. Make sure that the phone speaker is selected, not any virtual driver or forgotten headset.

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If you use wired headphones, try to remove and insert the plug again during the call - this will force the system to switch audio channels.

Compatibility table and typical errors

Below is a table that will help you quickly identify the problem depending on the symptoms and model of your device. Different Xiaomi series may have their own features of audio drivers.

Note that older models, such as the Redmi Note 8 or Xiaomi Mi 9, may have a problem with a lack of RAM when working in high resolution, in which case the reduced video quality in the Zoom settings can free up resources for audio processing.

Resetting and reinstalling the application

If none of the above methods worked, there was probably a critical software failure in the application files, in which case the solution would be to completely reset the application settings or reinstall it, which would remove the cache, temporary files and erroneous configurations.

To reset, go to Settings → Apps → All Apps → Zoom. Press Clear (or Memory) and then select Clear All Data. Don’t worry, your contacts and appointment history will be saved on the server as they are tied to your account, but local settings will reset.

After that, it is advisable to remove the app completely and download the latest version from the official Google Play store or GetApps. APK-Files may not be compatible with new updates to Zoom's audio encryption protocols.

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A full re-examination of the application with pre-cleaning data solves 90% of software conflicts audio on Android.

⚠️ Note: When clearing your data, make sure you remember your login and password from your Zoom account, as you will need to log in again.

Use of engineering menus and hidden tests

For advanced users, you can check the audio track through the engineering menu, which will help you understand whether the problem is system or hardware. Enter the code ##6484## in the dialer. CIT (Customer Information Test).

In the test list, find Receiver, Speaker, and Headset, run the tests in turn. If the test mode has sound and it's clean, it's good, and the problem is 100% software (in Zoom or Android). If there's no sound, it needs repair.

You can also try resetting your network settings, as sometimes VoIP audio streams depend on the network protocols working correctly. Path: Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.

Frequently Asked Questions (FAQ)