When Xiaomi suddenly stops making sounds through the main speaker, but everything is perfectly audible in the headphones, it is one of the most common and annoying problems users have: This can happen after another MIUI update, device drop, or even for no apparent reason.
The reason for this behavior is that it's dissynchronized audio output paths, or in more rare cases, physical damage to the multimedia speaker. Unlike a complete failure of the audio system, when sound is lost everywhere, the headphones indicate that the audio codec is working, which significantly narrows the range of possible malfunctions and allows you to hope for a software solution without going to the service center.
In this guide, we will go through all the steps of diagnostics in detail, from simple setting checks to complex manipulations of the engineering menu. You don't need to be an expert in electronics repair to complete most of the steps, the main thing is to consistently eliminate the factors that block the sound, and carefully monitor the reaction of the device to your actions.
Primary Diagnostics and Verification of Volume Settings
The first thing to do is to eliminate the trivial coincidence or random activation of the "silence" modes. In the MIUI shell, the management of sound profiles is quite difficult, and the user can unconsciously turn off the media channel, leaving the headphone channel on. Often the problem is solved by a simple reboot, but before that it is worth checking the volume levels for each type of content separately.
Press the volume button on the side of the case, then tap the top or gear on the screen to unfold the full mixer. Make sure the Multimedia, Calls and Alarm Sliders are raised to maximum. Sometimes the system can "remember" the low volume level for a particular application, and this value will apply each time it starts.
⚠️ Warning: If the sound doesn't appear after the device is fully restarted (not just turned off the screen, but restarted the system), check if the Do Not Disturb mode is activated. In this mode, system sounds can be blocked even if the volume sliders are twisted.
Also worth noting is the presence of third-party equalizer or amplifiers that can intercept audio control and create conflict with system drivers, try temporarily removing or disabling any audio-related programs and check the result.
It's important to distinguish between the types of sound: if you've lost the sound of a call but you've got the sound in games, the problem is the settings of the ringtones. If only the browser is silent but YouTube is working, look for the cause in the particular application. Localization is the key to a quick fix.
Bluetooth and peripheral device conflicts
One of the most insidious reasons for the lack of sound is an active Bluetooth connection. A smartphone may “think” that the audio should be output to an external device that was previously connected (for example, a wireless headphone in a bag or a speaker in the next room), even if there is no direct connection now, in which case the sound goes “nowhere”, and the built-in speaker is silent.
To test this hypothesis, completely disable the Bluetooth module in the settings or through the notification curtain. Don't just break the connection, namely, turn off the module itself. Then run any video or track. If the sound appears, then the problem was in the prioritization of the audio output.
Also, check the wired headphone jack. In models with a mini-jack 3.5 mm or in the USB-C port, the contact group may oxidize or get dust. The system may mistakenly detect the presence of a connected device in the socket. Try gently inserting and removing the headphone plug several times to mechanically clear the contacts.
If you are using an external or adapter DAC-Sometimes cheap adapters can short contacts, creating a false event of the headset connection, in which case the phone will block the built-in speaker, believing that priority should be given to the external accessory.
MIUI software failures and cache cleaning
The MIUI shell, like any complex operating system, is prone to a buildup of temporary files and services errors. AudioService, or the system process for mixing sounds, can freeze, often after a failed firmware update or installation of a heavy application.
The first step in software treatment is to clear the cache of system applications responsible for sound. Go to Settings menu → Apps → All apps. In the list, find Settings (or Settings), click Clear and select Clear Cache. This action is safe and will not delete your personal data.
☑️ Checklist of software diagnostics
Also, check if you have a third-party audio driver or theme that conflicts with system files. Try to temporarily switch to the standard Classic theme in the Themes app. Sometimes modified audio files in the themes can be corrupted.
If simple methods don't work, you can try resetting your network settings. This action will return to factory settings of Wi-Fi, Bluetooth and mobile network, which often eliminates deep software conflicts. Path to function: Settings → Connection and Sharing → Reset Wi-Fi, mobile network and Bluetooth.
Diagnostics through engineering menu and tests
Xiaomi and Redmi have a built-in tool to check hardware components, which allows you to isolate the software part from the physical breakdown of the speaker. To enter the test menu, use a special code in the Phone application.
If the code is entered correctly, you will open the CIT (Customer Inspection Test) menu. In the list, find the item associated with the sound, which can be called Speaker, Main Speaker or Audio.
| Type of test | Description of action | Expected output |
|---|---|---|
| Speaker Test | Playing a Melody Through the Main Dynamic | Loud, clear sound without wheezing |
| Receiver Test | Checking the speaker (in the ear) | The sound should be heard at the top of the cut. |
| Headphone Test | Checking the headphones | The sound only goes to the connected headphones. |
| Mic Test | Recording and reproduction from the microphone | A clear record of your voice |
If you hear a sound in the Speaker test, it means that the speaker is physically sound and the problem is 100% software, and a full Hard Reset may help, but make a backup before you do it, and if the test is silent or crackling, the situation is more serious.
What to do if the engineering menu code doesn’t work?
Physical Causes and Pollution Dynamics
And you don't have to discount the physical factors, because over time, the speaker grid gets clogged with dust, pocket pile and skin fat, and it creates a traffic jam that keeps the sound wave from coming out, and the sound becomes quiet, deaf, or completely disappears, even though the membrane is working inside.
Carefully inspect the speaker hole (usually located on the lower end or combined with a conversational one). If you see a dense layer of dirt, gently clean it with a soft toothbrush. It is strictly forbidden to use sharp objects (needles, pins), as you can damage the membrane or push the dirt deeper.
⚠️ Attention: Never try to blow the speaker with your mouth. Microscopic saliva drops, once on the membrane, will cause corrosion or sticking, leading to permanent breakage. Use only dry cleaning or special cleaning gels.
Another physical cause may be moisture. Even if the phone has IP68 protection, the leakage is broken over time. If the device has recently come into contact with water, the sound may disappear due to the oxidation of the plume contacts, in which case drying in a warm (not hot!) place can help, but the risk of corrosion remains high.
Resetting and extreme measures
When all software methods are exhausted and the engineering test shows that the speaker should work, the radical but effective method remains - a complete factory reset - this action will delete all user data, so preparing a backup is mandatory.
Before resetting, make sure that the battery is at least 60 percent. Go to Settings → About Phone → Settings → Reset → Erase all the data. It takes a few minutes. Once turned on, the phone will be like new. If the sound comes up, there was a problem in the software. If not, repair is required.
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Before you reset completely, try creating a new user on the system (if Android allows). Go to Settings → System → Multiple users. If there is sound on the new profile, then some installed application or its settings conflict.
It's also worth mentioning that the firmware rollback is possible, because if the sound is gone immediately after the MIUI update, there may be a bug in the new version, and then it helps to flash the device through the computer using the Mi Flash Tool utility and the archive of the previous stable version of the software.
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If after a complete reset of the system (Factory Reset) the sound from the speaker did not appear, and in the engineering menu the test also shows silence - the problem is hardware in nature and requires replacement of the speaker or repair of the plume.