On any TV I've seen you set it to show from HDMI and done. WebOS is just ignored.
In the past, I have used HDTVs as PC monitors, simply running an HDMI cable from the PC's graphic output to the HDTV's HDMI input. What I don't know is if I can do this with a Smart TV, which has an operating system, etc. I'm looking at an LG model that runs WebOS, for example. Can I bypass all that and just use it as a display? All I want is the 4k picture, and you have to go Smart TV for that.