LG Smart TVs are popular for their excellent picture quality, but sound problems can be frustrating. This guide covers all common LG TV sound issues and how to fix them.
Common LG TV Sound Problems
- No sound at all (picture is working)
- Sound is very low or distorted
- Audio delay or sync issues
- Sound cuts in and out
- No sound on specific apps or inputs
Quick Fixes to Try First
1. Check the Mute Button
It sounds obvious, but many sound problems are simply due to the TV being muted or the volume turned down.
2. Check Audio Output Settings
- Press the Settings button on your LG remote
- Navigate to Sound → Sound Out
- Select the correct output (TV Speaker, External Speaker, etc.)
- Make sure "TV Speaker" is selected if you're not using external speakers
3. Perform a Power Cycle
- Unplug the TV from the power outlet
- Press and hold the power button for 30 seconds
- Wait 5 minutes
- Plug the TV back in and turn it on
Troubleshooting Tip
LG TVs with webOS 4.0 and newer have a built-in "Sound Test" in the settings menu. This can help determine if the problem is with the TV or external devices.
HDMI ARC Sound Issues
Many LG TV owners use HDMI ARC (Audio Return Channel) to connect soundbars or AV receivers. Common ARC problems include:
- No sound from external speakers
- Audio sync issues
- Sound cuts out randomly
Fix HDMI ARC Problems
- Check that the HDMI cable is connected to the ARC port (usually HDMI 2)
- Enable CEC (Simplink) in the settings
- Try a different HDMI cable
- Update the TV firmware
- Update the soundbar or receiver firmware
Technical Note
LG TVs use a proprietary audio format called "LG Sound Sync" for optical and wireless connections. Make sure your external device supports the same format.
App-Specific Sound Problems
Sometimes sound issues only occur on specific apps:
- Netflix: Try changing the audio track
- YouTube: Check the video's audio settings
- Amazon Prime: Clear the app cache
- Local apps: Update the app or reinstall it
Hardware Problems
If you've tried all the above and still have no sound, the problem may be hardware-related:
1. Faulty Speaker
- Check if one speaker is working and the other isn't
- Test with headphones or external speakers
- If external works, the internal speakers may be faulty
2. Main Board Issues
- The audio processor on the main board may have failed
- This is more common on older LG TVs
- Replacement boards can be found online
3. Software Corruption
- Try a factory reset (Settings → General → Reset to Initial Settings)
- Check for firmware updates
- Sometimes a USB firmware update can fix the problem
Safety Note
Never open your TV unless you have proper training. Capacitors can hold dangerous charges even when unplugged. Always discharge capacitors before working on the power supply or main board.
LG TV Model-Specific Issues
- LG OLED (2017-2019): Known for audio delay issues. Fix: Enable "bypass" in audio settings
- LG NanoCell (2020+): Sometimes lose sound after firmware updates. Fix: Factory reset
- LG UHD (2016-2018): HDMI ARC problems. Fix: Use optical cable instead
When to Call a Professional
- If the TV is under warranty
- If you've tried all software fixes
- If you're not comfortable opening the TV
- If the problem is intermittent and hard to diagnose