Just purchased the 3812. Love this unit has a 14 cubic refrig with icemaker and plenty of room around bed to get in and out of. My problem is with the cable. I can not get it to find any channels. Stayed at two different campgrounds with cable and nothing from either one. I have the cable connected on the outside to the cable in on the outsided where it is marked cable. The cable behind the TV (Jensen) is connected to the cable outlet and to the TV in. I go to the menu on the TV and select Cable and run the channel scan, get no channels. In the bedroom there is a outlet with two cable connects and a red button which I know is the antenna boost beside this plate is another outlet with one cable connection. Should there be a jumper from one of these to the other one. The air antenna works fine. Thanks