OK new guy here so be gentle. I have an older sys. echostar Mod. 3900 w/Dish 500 duel LNBs Sat. 110&119. At times I get 110 for a whale then it freezes or goes away. At other times it will not work at all. I can hook the 110 lnb drirectly to the receiver and it works great. So I thought bad switch, only now it must be three bad switches, I am on my third and nothing has changed. OK are the sw's going bad or is the receiver eather, blowing them out or not switching it? Is there a way to test the switch and receiver. I am not electronicly gifted so try to talk down to me. Thank you for any help you can give me.