[DIRECTV] No Signal on one tv Cable & Satellite TV ...
Personally, I'd swap cables first. But that depends upon how you're wired up. If possible, take the one between the dish and receiver 1 and swap it with the one between the dish and receiver 2.
8 wired swm splitter diagram Gallery
directv swm splitter wiring diagram 35 wiring diagram
moved and new house has swim need a little help