The keyboard still works, but over time some keys become unusable. It’s basically unusable so you want to disable the built-in keyboard and use the USB keyboard
How to disable Laptop keyboard and use USB keyboard in Windows
You can disable the Laptop keyboard. This is the way:
Note: The trick explained below will work in Windows 7 and Windows 8.1 in addition to Windows 10.
1 – Press the Windows + S key combination to open the Search box.
2 – Enter the word Device in the Search box, then select Device Manager from the list of search results.
3 – Find Keyboards in the device list and click the arrow to expand it.
4 – Right click on the keyboard and click Disable . If there is no “ Disable ” option listed, click Uninstall .
5 – Click File > Exit . Your laptop’s internal keyboard should be turned off.
Note: If you had to choose Uninstall instead of Disable in step 4, the keyboard will be automatically detected and reinstalled if you’ve ever had a Device Manager section to scan for new hardware for some reason. If that happens, you need to repeat this procedure to uninstall it again.
That’s all there is to it, Greg. Your laptop’s internal keyboard should be turned off.