When the TV screen lights up but the desired audio is not to be provided, it can take anyone with a smart appliance by surprise, especially if you were planning an evening movie or an important football game, and most of the time, the problem is not the broken speakers, but the downed software settings or the wrong signal source.
Modern Android-based Smart TVs have a complex audio processing system where different coding formats can conflict. Users often forget that when connecting external devices via HDMI, the priority of sound can automatically switch to the receiver, even if it is turned off. Before panicking and looking for a service center, it is worth conducting a basic diagnosis.
In this article, we will discuss in detail all possible causes of the lack of sound and how to eliminate them, you will learn how to properly adjust the audio output parameters, update the drivers and use the hidden functions of the MIUI for TV system.
Basic Diagnostics and Verification of Physical Connections
The first step should always be to check the basics that are often overlooked.Make sure the TV is not in "No Sound" mode. The Xiaomi remote usually has a separate button with the speaker crossed out or a combination of keys to adjust the volume.
Check physical cables. If you're using external acoustics or soundbar, make sure the plug is tightly inserted into a 3.5mm connector or optical output. Loose connection is a common cause of intermittent signal.
⚠️ Note: If you are using a cable HDMI, Try reconnecting it to another port. Sometimes a particular connector may have driver conflict or physical wear and tear on the contacts.
Also worth paying attention to the external hardware indicators. If the sound must go through the home theater, make sure it is on and select the correct login mode (Input). Xiaomi TVs sometimes "forget" to activate the external output if the device was connected after the TV was turned on.
Customization of sound parameters in the Android TV menu
The main control over the audio stream is through the system menu. To get there, click the menu button on the remote and select the settings section. We're interested in the tab related to the device and preferences.
Inside the menu, find Settings → Sound, which gives you access to all the critical parameters, first check which audio output mode you choose as your primary, and the system can offer options like Automatic, HDMI, or Dynamics TV.
It's important to set the digital output right. If you have an advanced surround audio system, you need to activate the appropriate codec. For built-in speakers, you'd better choose a stereo.
- 🔊 Digital output: select "Auto" or «PCM», If there is no sound when connecting through HDMI.
- 🔊 Equator Mode: Try switching standard presets (Film, Music, News), sometimes it drops the software glitch.
- 🔊 Balance: Make sure that the left and right channel sliders are not moved to extreme positions.
Be sure to check if the Night Mode feature is activated, which can severely limit dynamic range, making the sound almost inaudible without headphones.
Problems with HDMI ARC and external devices
HDMI ARC (Audio Return Channel) technology allows you to transmit sound from TV to receiver over a single cable, but this is where protocol conflicts most often arise, the TV may think that the sound should go to the receiver, and the receiver is in sleep mode at this point.
To solve this problem, go to the advanced audio settings. Find the section responsible for HDMI and CEC. Try temporarily disabling the CEC function (in Xiaomi it can be called Device Control) to see if the sound will appear through the built-in speakers. If the sound appears, there is a problem in the handshake protocol between devices.
The cable version also matters. To deliver high-quality lossless audio, especially in Dolby Digital Plus formats, you need an HDMI High Speed or higher cable. Older cables can only transmit basic stereo or no sound at all.
⚠️ Attention: When in use HDMI ARC Make sure that the cable is connected to the port with the marking ARC. Normal. HDMI-The port will not be able to return sound to the external system.
If you use a console or a game console, check the settings of the console itself. Oftentimes, Xbox or PlayStation are set to output audio in a format that Xiaomi TVs cannot decode in real time.
☑️ Diagnostics HDMI ARC
Configure Bluetooth audio and wireless speakers
Xiaomi TVs allow you to connect wireless headphones and speakers. If you previously connected a Bluetooth device, the TV could automatically try to restore connection to it when turned on, redirecting the entire audio stream there.
To check this out, go to Settings → Remote and Accessories (or “Bluetooth”). See the list of paired devices. If there is an active device that is currently off or far away, the sound will go “nowhere.”
For the forced return of sound to the TV speakers:
- Open the list of Bluetooth devices.
- Find the connected gadget.
- Select “Disable” or “Forget the device”.
If you want to use a Bluetooth headset, make sure it's in pairing mode. Android TVs are sometimes cranky about codecs. If the headphones are plugged in but no sound, try in the engineering menu (if you have access) or in the developer's settings, change the Bluetooth codec to SBC or AAC, opting out of aptX HD, which may not be supported by the TV.
Hidden Bluetooth settings
Resetting and system update
Software failures are a common cause of sound loss, and updating the system can either fix the bug or (rarely) create a new one, so check for updates first.
Go to Settings → About TV → System Update. If a new version is available, install it. However, if the problem occurred after the last update, you may need to reset.
There are two types of discharge:
1. Soft reset: completely power out. Pull the cord out of the socket for 2-3 minutes. This will clear the system cache and start the sound drivers again.
2. Hard Reset: Full reset to factory settings.This will delete all your accounts and apps.
Before you complete the reset, be sure to save important data. Once you return to the factory settings, the TV will be as new as it is, and the software conflicts of the sound subsystem should disappear.
| Type of discharge | What's involved | When to apply |
|---|---|---|
| Reboot (Restart) | Operational memory, temporary processes | With single getting stuck sound |
| Shutdown from the network | Driver cache, static electricity | If the TV doesn't respond to the remote |
| Data reset (Factory Reset) | All user data, accounts, settings | Critical system errors |
💡
Before you complete the reset, take a picture of your network settings and lists of installed applications, which will save you time to restore the usual configuration of the TV.
Using third-party applications to amplify sound
If the regular means to increase the volume fails or the sound is too quiet, you can take advantage of the Android platform. Google Play Store for TV is available special utilities.
Apps like Volume Control or Sound Assistant can bypass system volume limits, creating a virtual layer on top of a standard Android mixer.
But be careful: artificially amplifying the signal with software can cause the speakers to wheez or burn out if you twist the slider to the maximum.
There are also equalizer apps that allow you to cut out the frequencies where the sound is "falling" and raise the ones that are better heard, which is useful for older models of TVs with imperfect acoustics.
💡
Software amplification is a temporary solution, and if the built-in speakers are wheezing even at medium volume, the problem is physical and requires repair or external acoustics.
Diagnostics of hardware faults
When all the software methods are exhausted, you have to talk about hardware. In Xiaomi TVs, the sound is responsible for a separate board or chip on a common board, and when voltage surges or factory defects, they can fail.
Symptoms of hardware breakdown:
The sound appears for a split second when turned on and immediately disappears.
You hear a crackling, a hum or a hissing, but you don't speak.
The sound is only on one frequency (for example, only high tones).
⚠️ Warning: Opening the TV itself deprives you of warranty. If the device is warranty service, do not try to disassemble it - contact an authorized service center.
A common problem is the drift of the plume connecting the motherboard to the speaker module, in which case it is quite gently to reconnect the contact inside the case, but if the sound amplifier burns, it will require soldering and replacement of components.