Take the top off your box look on circuit board for a little black transistor ( it has metal top with hole, the heat sink, and three pins on bottom) located about one inch in front of where you hook sat wire.
It could or could not be attached to an aluminum heatsink.
Make sure you get right one, part Tip42c or in the case of Viewsat, CNX and Sonicview KA317.
The Tip42C is located directly in front of the shiny box that your sat in coax connects to.
It is Black and plastic with metal extending above it with a hole in metal and has 3 legs which are soldered to the board,
Tip42C or KA317 is printed on the black plastic face.
Viewsat ultra's,Sonicview and CNX Receivers use the Fairchild KA317 Transistor and it is Mounted to a Heatsink
**********If the KA 317 goes bad on a CNX Receiver you will get LNB F error on the display.
----
Take note of the way it is oriented, if mounted backwards it will not work.
If you are getting NO Signal Message and have No Voltage at your Sat In Connector Hook up sat wire and take a small screwdriver and touch first two pins toward back of box together.
If you get a signal, then this transistor is bad and should be replaced.
NTE332 transistor is a direct replacement if you can't find the Tip42C.
Tip42A or Tip42B will not work.