Not to ask a stupid question but are you sure it's an output jack as oppose to an input for cable?
Oh yes. We have brought the tv outside and propped it up on a table. But with kids running around I'd like to be able to attach it to the wall. We've watched regular tv on it, but I can't figure out if I can play a movie from the inside DVD. Luckily DVD players are cheap. I can just buy a portable one if need be and store it under the bed or something.
This is the mount we have
http://www.amazon.com/gp/product/B00149RVK8/ref=oh_details_o08_s00_i00?ie=UTF8&psc=1