The best way to screen share from a windows 10 PC is to connect a Roku device (Model 2 or higher) to your LG HDTV via and HDMI cable. Then on you PC click on the "Notifications" icon ( lower right corner). The click on "Connect". After a few seconds you should see the Roku device listed. Click on that. Makem sure you are in the 'Duplicate' mode, not 'Extend". On your LG HDTV make sure you have selected the HDMI input that is used by your Roku device. You should now see and hear everything on the LG HDTV.