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First thought, make sure you dont have the cable going to your 2nd tv of the 625, on the Sat In port. You should be able to tell if you don't have a picture (dish logo screen) on the 2nd tv. Messed up pin is possible also, remember to unplug the receiver before you crimp another connector on the...

probably just being picky, you have the diplexor in the attic backwards in the diagram.