What HDMI ARC Does on an LG TV
If you want better audio from your LG TV without running extra cables, HDMI ARC is the feature to know.
This guide explains how to use HDMI ARC on LG TV models, what equipment it supports, and why the right settings matter.
HDMI ARC stands for Audio Return Channel.
It lets your TV send audio back through the same HDMI cable used for video, so one cable can connect your LG TV to a soundbar, AV receiver, or home theater system.
Why HDMI ARC Matters
Before ARC, many TV setups needed a separate optical cable to send audio to external speakers.
With ARC, the TV can pass sound to an external audio device over HDMI, which simplifies wiring and often improves control.
- Fewer cables behind the TV
- TV remote can often control volume on the soundbar or receiver
- Supports better TV audio integration than basic analog connections
- Works with many modern LG OLED, NanoCell, QNED, and UHD TVs
ARC is especially useful if you stream from built-in apps like Netflix, Disney+, Hulu, YouTube, or Apple TV on your LG television and want the audio to play through a soundbar.
What You Need Before You Start
To use HDMI ARC on an LG TV, you need a compatible TV and a compatible audio device.
Most LG TVs made in recent years include at least one HDMI port labeled ARC or eARC.
- An LG TV with an HDMI port marked ARC or eARC
- A soundbar, AV receiver, or home theater system with ARC support
- A high-speed HDMI cable in good condition
- Correct TV sound settings enabled
HDMI eARC is an enhanced version of ARC found on newer LG TVs.
It supports higher bandwidth and can pass more advanced audio formats, but the setup process is similar.
How to Use HDMI ARC on LG TV
1. Connect the HDMI cable correctly
Plug one end of the HDMI cable into the HDMI ARC or HDMI eARC port on the LG TV.
Then connect the other end to the HDMI ARC port on your soundbar or receiver.
The ARC label matters, because not every HDMI port on the device may support audio return.
2. Enable Simplink on the LG TV
LG uses Simplink for HDMI-CEC control.
This feature allows your LG remote to communicate with connected devices and helps ARC function properly.
On most LG TVs, go to:
- Settings
- General
- Devices
- HDMI Settings
- Simplink (HDMI-CEC)
Turn Simplink on if it is disabled.
3. Select the correct sound output
Set the TV audio output to HDMI ARC or External Speaker, depending on your LG model.
The exact menu names vary by webOS version, but the goal is to route sound away from the internal TV speakers.
Look for settings such as:
- Sound Out
- HDMI ARC
- External Speaker
- Receiver
4. Configure the soundbar or receiver
Make sure the audio device is set to the ARC input and not a different HDMI input.
Some soundbars automatically detect ARC, while others require you to choose the source manually.
5. Test the audio
Play something from a built-in app or cable box and confirm that sound comes through the external speakers.
Adjust volume with the LG remote to confirm CEC control is working.
How to Tell If ARC Is Working Properly
When HDMI ARC is active, the TV usually sends audio to the connected device automatically.
You may also notice the volume indicator for the soundbar or receiver appearing on-screen.
Signs that ARC is working include:
- No sound from the TV speakers
- Audio coming from the soundbar or AV receiver
- TV remote controlling system volume
- ARC or external speaker shown in the TV sound menu
If your setup includes eARC, the TV and audio device may also support higher-quality formats such as Dolby Atmos, depending on the app, device, and cable used.
Common Problems and How to Fix Them
No sound from the soundbar or receiver
Check that the HDMI cable is connected to the ARC-labeled port on both devices.
Then verify that Simplink is enabled and that the TV sound output is set to HDMI ARC or External Speaker.
Audio cuts out or is delayed
Try a different HDMI cable, especially if the current one is old or damaged.
Also check for firmware updates on both the LG TV and the soundbar or receiver, since HDMI compatibility issues are often fixed through updates.
TV remote does not control volume
This usually points to a Simplink or HDMI-CEC issue.
Re-enable Simplink, power-cycle both devices, and confirm the sound system supports CEC control.
Only some apps send audio correctly
Built-in LG apps and external devices may behave differently.
If streaming apps work but a game console does not, check the console’s audio output format, HDMI input selection, and any passthrough settings on the soundbar or receiver.
ARC vs eARC on LG TVs
ARC and eARC are related, but they are not identical.
ARC handles standard audio return over HDMI, while eARC increases bandwidth and improves support for higher-quality audio formats.
- ARC: works with many soundbars and receivers, supports common TV audio needs
- eARC: offers better audio support, including more advanced formats on compatible gear
If your LG TV and audio device both support eARC, use it when available.
If not, standard ARC still provides a simple and effective connection for most homes.
Best Settings for Better Sound
Once you learn how to use HDMI ARC on LG TV models, the next step is tuning your setup for reliable performance.
The best settings depend on your audio gear and the content you watch.
- Use the TV’s HDMI ARC or eARC port, not a regular HDMI port
- Turn on Simplink for control and compatibility
- Keep TV sound output set to external audio
- Update firmware on the TV and audio device
- Use a certified HDMI cable if you experience dropouts
If your soundbar has its own audio modes such as Cinema, Standard, or Bass Boost, test them with streaming content, sports, and live TV to find the clearest option.
When to Use ARC Instead of Optical Audio
Optical audio still works well in many setups, but HDMI ARC is often better because it can support easier device control and a cleaner connection.
If you want one remote, one cable, and simpler switching between sources, ARC is usually the better choice.
Optical may still be useful if your TV or sound system has ARC compatibility problems, but for modern LG TVs, HDMI ARC is generally the preferred option.
Frequently Overlooked Setup Details
Small configuration issues cause many ARC failures.
These often come down to mismatched ports, disabled CEC features, or outdated firmware.
- Verify the cable is connected to the ARC-labeled HDMI port on the LG TV
- Check whether the audio device needs ARC enabled in its own menu
- Restart both devices after changing settings
- Disconnect extra HDMI devices if troubleshooting a conflict
- Use the LG TV’s sound menu instead of the soundbar’s volume output alone
With the right port, settings, and device compatibility, HDMI ARC can turn an LG TV into a much cleaner and more polished home entertainment setup.