Hi everyone so I searched high and low for a solution to my issue with Windows 10 and Screen Cast on my LG UK6300PUE not working and finally found a solution.
For me, it had to do with my PC and TV connections. I like to hard wire everything and with both my PC and TV, they default to the more reliable, wired connection and disconnect the WiFi.
Well from what I understand, Screen Cast is based off of Intel's WiDi technology, WHICH REQUIRES WIFI CONNECTIONS TO WORK!
I did go through all the other suggestions, checking share settings in Windows and Media Player, resetting this and that. I'm not sure if I had to do any of that for Screen Cast to work but I did try all those common suggestion initially. So if Screen Cast is still not working for you, try those other suggestions posted in numerous places here and other forums.
I'm really surprised on all the forums I visited, this wasn't pointed out anywhere! I hope this helps those having issues with Screen Cast!
TL; DR: So basically on a WIRED connection, I could see my TV on my Windows 10 PC, but it would not connect. As soon as I connected BOTH my PC AND TV to WiFi, Screen Cast began to work.
My current LG UK6300PUE Software Version: 04.10.04
Windows 10 64-bit Build: Version 1803, OS Build 17134.34
Have you tried removing batteries from the remote and seeing if the remote is defective? Rather than the TV itself?