At the suggestion of a tech friend of mine, I bought the Microsoft Wireless Display Adapter and connected it to the LG UH3060 display per the instructions. My brand new Dell Lattitude 3580 still won't reliably connect to the display. My tech friend stopped by our office, fired up his Dell laptop and with two clicks he was connected, surfing all over the web, disconnected, reconnected multiple times not only to the MS adapter but also by using the Screen Share feature of the LG display. This morning we had an important webinar so I brought in my trusty HP laptop from home. Same thing, two clicks and the webinar was up and running on the LG display without a hiccup for its entire two hours. And, I was also able to connect via the MS adapter and the Screen Share function of the LG flawlessly multiple times.
So, at least in my case, it isn't the LG TV, it is definitely the new Dell laptop - which is being returned. I've wasted far too much time troubleshooting that boat anchor.