Yup, power inserter, cabling, ground block, splitter, LNB, receiver itself.
We can probably eliminate the cabling between the splitter and any other receivers as the as if this was bad it would most likely just effect one receiver.
We can probably eliminate a bad receiver if you have additional receivers that are experiencing the same issue.
First before disconnecting stuff to troubleshoot, unplug the power inserter.
Now, check all fittings.
Focus on the ones from the receiver with the power inserter, to the power passing port on the swm splitter.
then also from the splitter to the dish.
If they all look good, remove the ground block
If that does not work or if there is no ground block then pull the line off the power passing port and barrel it straight to the line coming from the dish.
At that point, I would try replacing the power inserter.
However, since you do not have an extra one like I would on my truck, you must improvise.
If you have multiple TV's this will work.
Remove the power inserter and run the line straight to SAT1 in using the receiver to power the dish.
If all the other TV's start to work, (besides that one) then it is a bad power inserter.
Unfortunately I have no tricks for testing the LNB other then hooking my meter to it or swapping it out.
I would recommend calling back until you get a more respectable service call time.
