The short answer
Check the TV’s audio output setting first — it needs to be set to the external speaker or HDMI ARC rather than the TV’s own speakers. Then confirm the HDMI cable is in the port specifically labelled ARC or eARC, because only one port on the TV carries audio out.
Sound problems feel harder than picture problems because there is nothing to look at. The fix is to treat it as a chain and test each link in order, rather than changing several settings at once.
The chain
Source, then TV, then soundbar. Audio has to be handed correctly between each.
1. The TV’s output setting
This is the most common cause. Even with everything wired correctly, the TV will keep using its internal speakers until told otherwise. Look for Settings, Sound, Sound Output, and select the external option — named Receiver, HDMI ARC, Audio System or Optical depending on brand.
2. The right HDMI port
Only one HDMI port on a television sends audio out, and it is labelled ARC or eARC. Any other port will pass picture in but no sound out. This catches people constantly when they rearrange their setup.
3. HDMI-CEC must be on
ARC depends on CEC, the feature that lets devices control one another. It is branded differently everywhere: Anynet+ on Samsung, Simplink on LG, Bravia Sync on Sony, Viera Link on Panasonic. If ARC is not working at all, check CEC is enabled on both the TV and the soundbar.
4. The audio format
If sound works on some content and not others, this is why. A soundbar that does not decode Dolby Digital Plus or DTS will output silence when given it. Set the TV’s audio output format to PCM or Stereo, which every soundbar handles, and see whether the silence resolves.
Testing it properly
Confirm the soundbar itself works
Play something over Bluetooth from your phone. If that works, the soundbar and its speakers are fine and the fault is in the TV connection — which removes half the possibilities immediately.
Check the TV's sound output setting
Settings, Sound, Sound Output. Select the external device. If the option is greyed out or missing, the TV is not detecting the soundbar, which points at the cable or the port.
Move the cable to the ARC port
Find the HDMI port labelled ARC or eARC and use that one. Push both ends fully home.
Enable CEC on both devices
Turn on the brand-specific CEC setting on the TV and on the soundbar. Power both off and on afterwards, because CEC negotiates at startup.
Set the audio format to PCM
In the TV’s audio settings, change the digital output format to PCM or Stereo. This eliminates format incompatibility as a cause.
Power cycle everything in order
Unplug the TV and the soundbar at the wall for 60 seconds. Plug the TV in first, let it fully start, then the soundbar. HDMI handshakes are established at power-on and get stuck surprisingly often.
Try optical as a diagnostic
If you have an optical cable, connect it and switch the soundbar to that input. Optical carries no video and does not use CEC, so if sound works there, the fault is specifically in the HDMI ARC path.
If built-in TV apps produce sound but a games console or streaming box does not, the fault is that device’s own audio output setting. Set it to PCM or Stereo in the device’s settings rather than changing anything on the TV.
Frequently asked questions
What is the difference between ARC and eARC?
eARC is the newer version with far more bandwidth, enough for uncompressed and object-based formats such as Dolby Atmos and DTS:X. ARC handles compressed surround. Both need the correctly labelled port, and eARC also wants a high-speed HDMI cable.
Why does my soundbar cut out intermittently?
Usually a CEC handshake renegotiating, or a cable that cannot sustain the bandwidth. Try a different certified HDMI cable and, as a test, disable CEC to see whether the dropouts stop.
Should I use HDMI ARC or optical?
HDMI ARC where available, because it supports higher-quality formats and lets one remote control volume. Optical is more robust and simpler, and remains a good fallback when ARC misbehaves.
Why is the sound out of sync with the picture?
Audio processing takes time, and the delay varies by device. Most TVs and soundbars have an audio delay or lip sync setting — adjust it while watching someone speak on screen.
Check the TV’s sound output setting and the ARC port. Between them they explain most silent soundbars.
