When I got the van there was no box in place, it had been removed by the previous owner, but there was the cable from the dish and a scart/phono lead all in the first overhead locker behind the passenger seat and thats why I started looking for an all in one as I didnt like the size of the Diopus and needed to get a fta box anyway. The plan is to get a sat cable across to the tv bracket along the same route of the scart lead and join the two sat cables and remove the scart lead.
So to answer your question, assuming that you have a similar set up to me, then you can use the tv as a monitor as you will select the phono type connection and you can tune in each part of the tv seperately (analog/dtv/cable/sat). I was using the built in dvd player at the weekend as I still couldn't figure out how to get the satellites (now I know
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The tv uses a headphone jack type spliter to give the phono connections (they are supplied), if you want I will take pictures and email them to you.