LG S75Q eARC Not Working: What This Usually Means
If your LG S75Q eARC not working issue is preventing Dolby Atmos, surround sound, or TV audio from reaching your soundbar, the problem is usually in the HDMI connection, TV audio output settings, or a compatibility handshake.
The good news is that most cases can be fixed without replacing hardware.
The LG S75Q supports enhanced Audio Return Channel over HDMI, but eARC depends on the TV, cable, source device, and firmware all agreeing on the right signal path.
That makes this issue less about a single defect and more about a chain of settings that must line up exactly.
How eARC Works on the LG S75Q
eARC, or enhanced Audio Return Channel, sends audio from your television back to the soundbar through the HDMI cable.
On the LG S75Q, that connection is typically used for higher-bandwidth formats such as Dolby Atmos, Dolby Digital Plus, and multichannel PCM, depending on the TV and source device.
Unlike standard optical audio, eARC can carry more advanced audio formats and can reduce cable clutter.
However, it also requires proper HDMI port selection, a compatible TV with eARC support, and firmware that handles the handshake correctly.
Common Reasons LG S75Q eARC Stops Working
Several issues can break the audio return connection.
The most common include:
- Wrong HDMI port on the TV or soundbar
- HDMI cable not rated for high-speed or Ultra High Speed use
- TV audio output set to internal speakers instead of HDMI eARC
- HDMI-CEC disabled, which can interfere with control and audio routing
- Outdated firmware on the TV or LG S75Q
- Source device sending an incompatible audio format
- Handshake failure after a power outage or input change
- Conflicting settings such as pass-through, bitstream, or PCM mode
In many homes, the issue appears after a routine change, such as switching streaming devices, updating the TV, or replacing an HDMI cable.
Check the Physical HDMI Connection First
Start with the cable path.
The LG S75Q should be connected to the TV’s HDMI port labeled eARC or ARC, not to a standard input port.
On many LG TVs, this is HDMI 2 or HDMI 3, but the exact port depends on the model.
Inspect both ends of the cable and make sure the connection is secure.
If possible, use a certified High Speed HDMI cable with Ethernet or an Ultra High Speed HDMI cable, especially if you are passing 4K video, HDR, or Dolby Atmos from connected devices.
- Power off the TV and soundbar
- Unplug the HDMI cable from both ends
- Reconnect the soundbar to the TV’s eARC or ARC port
- Turn the TV on first, then the soundbar
- Test audio from a built-in app such as Netflix or YouTube
Verify the TV Audio Output Settings
For eARC to work, the TV must be told to send sound out through HDMI.
On LG TVs, the audio output should typically be set to HDMI ARC or HDMI eARC, depending on the model and menu labels.
If the TV remains set to internal speakers, the soundbar will not receive audio.
Also check whether the TV is set to a mode that supports pass-through or external audio device control.
Menu names vary across LG, Samsung, Sony, TCL, and other brands, but the logic is the same: the TV must route audio to the soundbar instead of local speakers.
Key settings to review
- Sound Output: HDMI ARC/eARC or External Speaker
- eARC Support: On
- HDMI-CEC/Simplink: On for LG TVs
- Digital Sound Output: Pass Through or Auto
- TV Speaker: Off or not selected
Make Sure HDMI-CEC Is Enabled
HDMI-CEC is the control layer that allows the TV and soundbar to communicate.
LG calls its CEC implementation SimpLink, while other manufacturers use names such as Anynet+, Bravia Sync, VIERA Link, or EasyLink.
If HDMI-CEC is off, the TV may fail to detect the LG S75Q correctly, even if the cable is fine.
Enable CEC on both the TV and any connected source device.
Then power-cycle the system so the devices can negotiate again.
In many cases, this alone restores eARC audio routing.
Update Firmware on the TV and LG S75Q
Firmware updates often resolve HDMI handshake bugs, audio dropouts, and eARC detection problems.
Check the LG S75Q for the latest firmware through the LG app, USB update method, or the soundbar’s support tools if available.
Also update the TV, since the eARC controller lives on the television side.
If the issue started after a recent update, a reboot may still be enough.
Unplug the TV and soundbar from power for several minutes, then reconnect and test again.
This clears many temporary CEC and HDMI states.
Test With Built-In TV Apps and External Devices
To isolate the issue, test audio from both built-in streaming apps and an external HDMI device.
If the LG S75Q works with Netflix on the TV but fails with a PlayStation 5, Xbox Series X, Apple TV 4K, or Roku, the source device settings are likely the problem.
Use these checks:
- Built-in apps test the TV’s own eARC output path
- External devices test the incoming HDMI audio format
- Different devices may require different audio settings
If one app or device works and another does not, the soundbar is not necessarily defective.
It often means the source device is sending Dolby MAT, PCM, or bitstream audio in a way the TV or soundbar is not currently negotiating correctly.
Adjust Source Device Audio Settings
Gaming consoles and streaming boxes often need manual audio configuration.
For example, a console may be set to stereo PCM by default, which limits surround output.
Another device may force an unsupported format that breaks eARC passthrough.
Look for settings such as:
- Audio format: Bitstream, Auto, or Dolby
- Audio output: HDMI
- Surround sound: On
- Dolby Atmos: Enabled if supported
- Passthrough: Enabled on media devices and TVs that support it
For troubleshooting, start with the most compatible setting offered by the device, then test more advanced options one at a time.
Power Cycle the Entire AV Chain
eARC problems are often caused by handshake errors that persist until all devices fully reset.
A proper power cycle is more effective than simply turning devices off with a remote.
- Turn off the TV, soundbar, and any HDMI sources
- Unplug them from wall power
- Wait at least 60 seconds, longer if possible
- Reconnect the HDMI cable securely
- Restore power and turn on the TV first
- Turn on the LG S75Q next, then external devices
This process forces the devices to renegotiate the HDMI-CEC and eARC connection from scratch.
When the LG S75Q Still Won’t Connect
If the LG S75Q eARC not working issue continues after cable checks, settings verification, and firmware updates, the remaining possibilities are often incompatibility or hardware fault.
Some TVs have known eARC quirks with certain soundbars, and some HDMI cables fail under higher-bandwidth audio negotiation even when video appears fine.
At that point, try a different certified HDMI cable, test the soundbar on another eARC-capable TV, or connect a different soundbar to your TV’s eARC port.
That comparison helps identify whether the issue follows the TV, the cable, or the LG S75Q itself.
If your TV only supports ARC rather than eARC, remember that advanced formats may not pass through as expected.
In that case, the soundbar may still work for standard Dolby Digital audio, but not for every high-bitrate format.
Best Practices to Keep eARC Stable
Once the connection works, a few habits can reduce future dropouts and detection failures:
- Use a certified HDMI cable and avoid unnecessary adapters
- Keep the TV and LG S75Q firmware updated
- Leave HDMI-CEC enabled unless it causes a specific conflict
- Avoid frequent cable swaps while devices are powered on
- Use the TV’s eARC port consistently for the soundbar
- Match audio settings across the TV, console, and streaming box
These steps help maintain a reliable handshake, especially in systems with multiple devices such as smart TVs, game consoles, Blu-ray players, and streaming boxes.