Picture the satellite signal like flowing water; it needs to go through different conduits from its source (The satellite), to its destination (The TV).
You need to make sure that your diplexers are wired right. If you move TV1 (Where the receiver is) to TV2 location, you need to switch the cables around at the dish, or exterior TV box. Where there is one diplexer there is another.
If you don't have one located in back of your receiver, then you have a dedicated line like the above person mentioned. 98% chance you don't and you have a diplexer like the one pictured.
If you respond, I'll follow up. otherwise, good luck!