A tip for any new LG Smart TV owners.
For some reason our new TV DIDNT have Youtube, or several other services that our older LG has.
Nor would it screenshare YouTube from any of our phones - which again our old LG does.
After a google search I found a solution; change the "Service Provider - Country" to USA.
Hmm, USA isnt on the list (??!!), go right to the bottom and select "Other", click "OK" when it warns you it will restart the TV, and "HEY PRESTO, all the missing services appear and now ScreenShare works (after a few updates).
I presume this is some stupid licensing issue.
Another Hmm; our old LG announced a firmware update an hour ago; it will be interesting to see if Youtube has vanished from it; and if the same work around is needed.