This post isnt a question to a technical problem I have, but it is a possible fix to the VIP612 or other VIP receivers supplied by Dish.
I too had the endless loop problem that alternated between 'Aquiring Signal' and 'Downloading Guide', would get 20 second of TV if I was lucky, then the loop would start all over. After checking connections, using '6-1-1' to check switches, defaulting the settings. . .ect ect. . .I called tech support and the person I talked to had no clue on what was going on. This techs solution was to send us a replacement unit, which would take 5 days to recieve.
Hmmmmmm. That really ticked me off. I'm pretty savy with tech, so I busied myself checking everything over again (my wife wouldn't be able to endure 5 days of her drama TV . . . >(8 ] . . .) Now we have internet connected into our DVR for the 'On-Demand' streaming features, so I started wondering if there was a conflict somewhere. My wife had told me she had streamed a few movies the previous day and had stopped one in the middle because it was a horrible movie. That night the guide went to update, and WHAM. We were stuck in the endless loop.
Here is the fix. It is as simple as removing the patch cord from the DVR to the modem. Instantly the guide updated, and the Sat feed came right back. No problems. Re-inserted the patch from the modem, and finished updating the movie list.
Before you folks go into soft reboots, hard reboots, switch checking, splitter tightness, grounding. . .blah-de-blah blah. . . and ultimately pulling your hair out because you will be without service for a number of days, give this a try. Quick, easy, takes 2 minutes.