If it was water in the LNB then the voltage feed up to the LNB has probably been shorted out.
There is a small inductor very close to the LNB rear connector on the box, usually mounted on the pcb inside the metal can holding the LNB connector. It might even be a surface mount inductor.
It is very likely that this has burnt out. The covers on the metal can are usually removable by prising off with a screwdriver. Sometimes there may be a soldered lug that has to be released first.
Disconnect form the mains before investigating!
Alan
I love Hendrix for so many reasons. He was so much more than just a blues guitarist - he played damn well any kind of guitar he wanted. In fact I'm not sure if he even played the guitar - he played music. - Stevie Ray Vaughan