Picture perfect, sound gone. It is one of the most common TV faults and one of the least likely to be a hardware failure, because the audio and video paths in a modern TV diverge early and audio passes through far more settings on its way out. Nine times in ten the fix is in a menu.
The short answer
Check the obvious mute and volume first, then the TV’s audio output setting, which often switches itself to an external device that is not connected or not on. If you have a soundbar or receiver, power cycle the whole chain in the right order. If sound works on one input but not another, the problem is that source or its HDMI cable, not the TV.
Narrow it down in sixty seconds
Three quick tests tell you where the fault lives:
- Do the TV’s own built-in apps have sound? If yes, the TV speakers work and the problem is with an external source.
- Does sound work on one HDMI input but not another? That points at the device or cable on the silent input.
- Do headphones plugged into the TV work? If headphones play but speakers do not, the output routing is wrong or the speakers have failed.
Rule out the simple things
Check mute, check volume on both the TV remote and any soundbar remote, and check that a secondary audio track has not been selected. Some broadcasts carry an audio description or alternate language track that can sound silent if it is not being transmitted.
Set the audio output back to the TV speakers
In the TV sound menu, find the speaker or audio output setting and set it explicitly to the internal speakers. TVs switch this automatically when they detect a soundbar and frequently fail to switch back when the soundbar is off. This is the single most common cause.
Power cycle the whole chain in order
Turn everything off and unplug it at the wall: TV, soundbar or receiver, and every source box. Wait a full minute. Then power on in this order: source devices first, then the soundbar, then the TV last. HDMI negotiates audio capability at connection time, and a bad handshake sticks until everything renegotiates.
Change the digital audio format
In the sound settings, look for digital audio out or audio format and switch it from Auto or Bitstream to PCM. If your TV is sending a surround format the soundbar cannot decode, you get silence rather than an error message. PCM is understood by everything.
Check you are using the right HDMI port for audio return
If your soundbar connects to the TV by a single HDMI cable, it must go into the port labelled ARC or eARC, and nowhere else. Any other port will carry picture but not send audio back out. Confirm the cable is in the labelled port at the TV end.
Enable HDMI-CEC on everything
Called something different by every maker, but it is the feature that lets devices talk to each other over HDMI. ARC depends on it. Turn it on in the TV, the soundbar and the source box. If it was already on, turn it off and back on.
Swap the HDMI cable
Audio return over HDMI is more demanding than plain video, and an old or thin cable can carry a picture perfectly while failing to pass audio back. A certified high-speed cable is cheap and rules this out.
Try a different connection entirely
If your TV and soundbar both have optical outputs, connect them that way as a test. Optical carries stereo and basic surround reliably. If sound returns over optical, the fault is in the HDMI path.
Write down every setting before you change it. Audio menus have a lot of options and it is easy to end up several changes deep with no idea what the original state was.
Source-specific gotchas
Streaming devices
Most streaming sticks have their own audio settings, separate from the TV. Look for an option to force stereo or to disable passthrough of surround formats. A stick set to output a format your TV cannot decode produces exactly this symptom.
Game consoles
Consoles let you pick an audio output device and format independently of the TV. If the console is set to output over optical and there is no optical cable, you get silence. Check the console’s own sound settings before blaming the TV.
Laptops over HDMI
Plugging a laptop into a TV does not automatically move the audio. In your laptop’s sound settings, select the TV as the playback device explicitly. This catches almost everyone the first time.
If sound cut out and has not come back after everything above, try a TV factory reset before assuming a hardware fault, but back up nothing and expect to sign into your apps again. Reset is disruptive, and worth doing only once you have exhausted the settings.
When it really is hardware
Signs that point at the TV itself: no sound from the built-in apps, no sound through headphones either, crackling or distortion before the silence, or a burning smell. Speaker amplifier failures do happen, particularly in very thin sets where the drivers run hot. If the TV is under warranty, stop troubleshooting and call. If it is not, a soundbar is almost always cheaper than the repair and better than the original speakers anyway.
Why did sound disappear after a TV software update?
Updates reset audio output settings surprisingly often, typically back to an external device or to a surround format your equipment cannot handle. Go through the sound menu and set the output and format explicitly.
What does ARC mean on my HDMI port?
Audio Return Channel. It sends sound from the TV back down the same cable to a soundbar or receiver, so one cable does both directions. Only the port labelled ARC or eARC can do this.
Should I use PCM or Bitstream?
Use PCM when troubleshooting, because everything understands it. Switch back to Bitstream afterwards only if you want surround formats and you have confirmed your soundbar decodes them.
Why is there sound on live TV but not on streaming apps?
The apps are negotiating a different audio format. Look in the streaming app’s own settings for an audio quality or format option and set it to stereo as a test.
Can a bad HDMI cable cause no sound but good picture?
Yes, especially for audio return, which is more demanding than one-way video. Swapping the cable is a quick and worthwhile test.
The bottom line
Check the audio output setting before anything else, because a TV silently switching to an absent soundbar accounts for a large share of these. Then power cycle the whole chain in order, and set the digital format to PCM. If the TV’s own apps are silent and headphones are silent too, that is the point to suspect the hardware.
