Why an LG Soundbar Buzzes in the First Place
If you want to know how to fix LG soundbar buzzing sound, the key is to identify whether the noise comes from the audio signal, the power source, or a hardware fault.
A buzzing sound can be caused by something as simple as a loose cable or as specific as electrical interference, a bad ground, or a damaged speaker driver.
LG soundbars are popular because they pair easily with LG TVs, streaming devices, and Bluetooth sources, but that same convenience can make troubleshooting confusing.
The buzz may appear only at certain volume levels, only when the TV is on, or only during wireless playback, which helps narrow the cause.
Check the type of buzzing sound
Before changing settings or replacing parts, listen carefully to the noise.
The pattern often points to the source.
- Constant buzzing: usually suggests power interference, grounding issues, or a hardware problem.
- Buzzing only at certain volumes: often points to speaker distortion or an overloaded audio signal.
- Buzzing during Bluetooth playback: may involve codec issues, wireless interference, or a device setting.
- Buzzing when connected to TV: can indicate HDMI, optical, or ARC/eARC handshake problems.
Inspect all cables and connections
Loose or damaged connections are one of the most common reasons an LG soundbar makes a buzzing noise.
Even a cable that looks seated properly may have a weak connection or poor shielding.
What to check
- Unplug and reconnect the power cord at both ends.
- Inspect HDMI, optical, AUX, and subwoofer cables for fraying or bent pins.
- Replace any cheap or damaged cables with well-shielded, high-quality alternatives.
- Make sure HDMI ARC or eARC is connected to the correct TV port.
- If using optical audio, confirm the connector clicks firmly into place.
For wired subwoofers, check whether the buzz comes from the subwoofer itself or from the main soundbar.
A subwoofer hum can sound like a soundbar issue, but the fix may involve repositioning or replacing only one component.
Rule out electrical interference
Electrical noise is a common cause of low-frequency buzzing.
Soundbars can pick up interference from nearby power supplies, routers, monitors, LED lights, and other electronics.
Try these placement fixes
- Move the soundbar away from Wi-Fi routers, gaming consoles, and cable boxes.
- Keep power cables separated from audio cables.
- Plug the soundbar directly into a wall outlet instead of a crowded power strip.
- Test a different outlet on another circuit if possible.
- Temporarily unplug nearby devices to see whether the buzzing stops.
If the buzz disappears after moving the soundbar or changing outlets, electrical interference is likely the cause.
A power conditioner or surge protector with noise filtering can help in some setups.
Test the source device and audio format
The source device can create a buzzing sound if the audio output format is incompatible with the soundbar or TV.
This is especially common with HDMI ARC/eARC, optical connections, and streaming devices.
Recommended checks
- Switch from Dolby Digital or Dolby Atmos to stereo PCM and test again.
- Change the TV audio output mode between Bitstream, Auto, and PCM.
- Try a different source, such as a Blu-ray player, game console, or phone.
- Lower the volume on the source device and raise it on the soundbar.
- Disable audio enhancements on the TV or streaming app.
When the buzzing stops with PCM, the issue may be related to surround-sound decoding rather than a defective soundbar.
That makes the fix more about compatibility than repair.
Is the subwoofer causing the buzz?
Many LG soundbar systems use a wireless subwoofer, and a buzzing or humming sound may come from that unit instead of the main bar.
A subwoofer placed too close to a wall, floor vent, or other electronics can amplify unwanted noise.
Subwoofer troubleshooting steps
- Move the subwoofer a few feet away from walls and corners.
- Disconnect and reconnect the subwoofer to re-pair it.
- Check whether the buzzing happens only during deep bass scenes.
- Test the system with bass-heavy content at lower volume.
- Inspect the subwoofer power adapter for heat, damage, or looseness.
If the subwoofer buzzes even when no audio is playing, the issue may be electrical or internal.
Persistent idle hum can also point to a failing power supply.
Reset the LG soundbar and TV settings
Software glitches can create audio artifacts, including buzzing.
A full reset can clear temporary errors in the soundbar, TV, or connected device.
What to do
- Power off the soundbar and unplug it for at least 60 seconds.
- Restart the TV and source device.
- Reconnect the soundbar and test again.
- If available, restore the soundbar to factory settings using the LG remote or button combo in the manual.
- Update the soundbar firmware through the LG app or support tools if your model supports it.
Firmware updates can improve HDMI compatibility, Bluetooth stability, and overall audio processing.
If buzzing started after a TV update or new device setup, a reset is especially worth trying.
Check for speaker distortion or physical damage
If the buzzing sounds harsh, rattling, or mechanical, the speaker driver may be damaged.
This is more likely if the noise occurs at higher volumes or on specific bass notes.
Signs of hardware damage
- Buzzing becomes worse as volume increases.
- One side of the soundbar sounds different from the other.
- The sound is distorted even after changing cables and inputs.
- You hear rattling from inside the cabinet.
Physical damage may require professional service or replacement.
If the soundbar is under warranty, avoid opening it yourself, since that can affect support eligibility.
Adjust sound settings that may trigger buzzing
Some LG soundbar features can exaggerate weak inputs or amplify distortion.
Tests with simpler settings can reveal whether audio processing is the problem.
- Turn off bass boost or extra low-end enhancement.
- Disable AI Sound Pro or similar automatic processing modes.
- Reduce surround effects temporarily.
- Set the soundbar to a standard movie or music mode.
- Try a lower subwoofer level if your system supports it.
If the buzzing disappears with simplified settings, the soundbar may be fine, but one of the enhancement modes is pushing the audio chain too hard.
When to replace a cable, adapter, or component
Some buzzing problems are not worth overthinking.
If a specific cable, adapter, or power brick is old, bent, or poorly shielded, replacement is usually the fastest fix.
Replace first if you notice
- Intermittent buzzing when touching a cable
- Visible wear on the power cord
- Loose HDMI or optical connectors
- Third-party adapters with uncertain quality
- Buzzing that changes when the cable is moved
Using certified HDMI cables and proper power accessories reduces the chance of recurring noise issues, especially in home theater setups with multiple components.
When to contact LG support or a technician
If you have already tested different cables, outlets, devices, and audio modes, the problem may be inside the soundbar or subwoofer.
At that point, the most efficient next step is professional support.
Contact LG support or a qualified technician if the soundbar produces buzzing when idle, smells burnt, shuts off unexpectedly, or shows signs of internal damage.
These symptoms can indicate a failing amplifier, power board, or speaker assembly.
Have your model number, serial number, and a list of troubleshooting steps ready.
That makes it easier to determine whether the issue is covered under warranty or requires repair.