I tried to learn the IR codes - the remote said "success" after a few tries but it works poorly. The power sequence seems to repeat so the box appears to turn on briefly and shut off. The up channel button is the only one I got to work. I thought one of the VCR or other zenith preprogrammed codes might work as I really only need power and channel up/down but none of them seemed to work so I tried learning. Am I going to have to resort to JP1?