Hi Rob Ge,
Thank you for reaching Microsoft Community. I understand that you're experiencing issues with your Surface Laptop 4's built-in speakers.
Based on the information you've provided; it seems like you've already tried a number of troubleshooting steps to fix the issue. Considering that the issue only occurs on the left speaker and also does not occur when using external audio devices like headphones, this is likely a hardware issue already but before we conclude, let us try some other steps first:
- Check for Windows updates: Make sure that your Surface Laptop 4 is up to date with the latest Windows updates. To do this, go to Settings > Windows Update and click on "Check for updates". If there are any updates available, install them and see if the issue is resolved. Make sure all updates are installed including Optional updates.
- Disable audio enhancements: Sometimes, audio enhancements can cause issues with the sound quality. To disable audio enhancements, go to Control Panel > Sound > Playback tab > Speakers > Properties > Enhancements tab and check the box next to "Disable all enhancements". Click OK and see if the issue is resolved.
- Reset the audio service: Sometimes, resetting the audio service can help resolve audio issues. To do this, press the Windows key + R to open the Run dialog box, type "services.msc" and press Enter. In the Services window, scroll down to "Windows Audio" and right-click on it. Select "Restart" and see if the issue is resolved.
- Run the Surface Diagnostic Toolkit: The Surface Diagnostic Toolkit can help diagnose and fix issues with your Surface device. See: Fix common Surface problems using the Surface app and Surface Diagnostic Toolkit - Microsoft Support
If none of these steps work, it's possible that there may be a hardware issue with your Surface Laptop 4's speakers. In this case, I would recommend contacting our live support for further assistance. You can reach them through these steps:
- Go to Contact Us - Microsoft Support
- Choose how you would like to get support for your Surface device.
- Type in the problem you need help with.
- Look at any available solutions offered and select Contact Support.
You may also see this forum article by Barb Bowman for a more detailed guide in getting phone or chat support: How to get Phone and Chat Support (for Surface Home/Consumer - Microsoft Community
I hope this helps! Let me know if you have any other questions or concerns.
Kind regards,
Marrion