I've spent the past 2 months trying to get this unreliable feature to work. Excuse the long post, I hope this will help those who don't want an hdmi wire inbetween their computer and tv to view streaming live tv or desktop from their computer.
For the record, mine is a 2015 win 10 quadcore hp desktop 'puter and 49uf6430 lg smart, 2015 model. And I'm not a teckie, just a determined user.
I've concluded this is the fault of both lg and microsoft. The most important thing is to establish a screenshare connection (handshake) first by trial and error using add device.....to do this go to devices>connected devices>add devices. Keep in mind, no matter what windows asks about entering a password, THERE IS NO PASSWORD AND THE ONE THAT POPS UP ON YOUR LG WIFI DIRECT WILL NOT WORK IN THE PASSWORD BOX ON YOUR COMPUTER. Neither will 0000 or 7777.
In this page, after you establish the first original connection, you will see your tv icon under "projectors" and under other devices "generic PnP monitor". Whatever you do, don't delete these or you'll need to start over. Scroll down to related settings, and click on "devices and printers"...you should see your generic and lg icons there under devices. Again, don't ever delete either of these or you'll need to start over.
Now for the hoops you'll need to jump through in order to connect from now on:
1- Be sure your tv is NOT connected to internet (important). Too bad mine doesn't remember my password.
2- SHUT DOWN computer.
3- RESTART TV, go to sreen share and let it sit there. Nevermind wifi direct, it's useless.
4- Start your computer and wait till it's fully booted before next step.
5- Right click on your desktop, give it about 10 seconds to load, and then click "connect to projector".
6- When the "lg webos" icon appears on the right side, IMMEDIATELY click on it.
7- You should see the spinning balls on your tv screen and your monitor screen should flash once....if it doesn't that likely means it won't connect and if it doesn't try hitting cancel (if it's there) and clicking the icon once more. You can also try once more without rebooting if you see the message in yellow......just click out of display settings and go back in. (Just thought I'd mention this although it doesn't always work and you'll need to reboot everything over again anyway)
8- If this fails, you need to go back to step 1 and start over.
This all really sucks, but until a fix comes along this works for me 95% of the time. I should also note I'm NOT set up for screen SHARE.....it might matter. I like this feature because I can stream KODI and foxnews go live from my desktop wirelessly.
I HOPE THIS HELPS SOMEONE WITH THIS REDICULAS PROBLEM. Feel free to add to this, I enjoy learning new things.