Hi, I am an Independent Advisor.
Please let me help you with this concern.
I understand that you are having issues with your internal mic.
And since you have run the troubleshooter, follow the steps below to get it fixed.
Here are the steps to completely remove a Device from your computer.
Step 1. Use shortcut keys Windows key+ X.
Step 2. Select Device Manager.
Step 3. Expand the entry Sound, Video, and Game Controllers Right-click the problematic device it is either Realtek Audio, or AMD High-definition Audio or High-Definition Audio this varies on the audio device installed in your PC, and select Uninstall device.
Step 4. You need to check the option Delete the driver software for this device and then click the Uninstall button.
Step 5. Do it on all the Audio drivers found under Sound, Video, and Game Controllers. Remove all then once everything is removed, click on the magnifying glass at the top, that is the scan for hardware changes option, wait until everything gets installed, then restart the PC.
After the reboot, please see if the problem is fixed.
If that still does not work, please visit the support website of your laptop or desktop and then download and install the latest Audio driver then restart the PC.