LG Monitor Secret Menu (Miracast)
access the LG secret menu
LG Monitor Secret Menu
1 Press and hold settings (gear icon) on remote until menu disappears and current input is displayed in upper left corner
2 You now need to enter 1105 and OK within 5 seconds
This is tricky and keep trying steps 1&2 until secret menu appears
Once in secret menu you can activate screen sharing.
To find Screen Sharing once it's activated press the House icon on the remote an select screen sharing
Note these instructions are not in any documentations.