Hi Lak7,
I was trying to find information about testing an LNB (with a multitester or something like that)
if you have a multi-meter with a setting to check diodes, you can do a rough check of the lnb.
when hooking the positive terminal of the meter to the center conductor and the negative to the outside conductor it should read somewhere in the neighborhood of 0.5v
when hooking the neg to the center and the pos to the outside it should read somewhere around 1.8v
every ku lnb that i have seen that was completely dead read either shorted both ways or open both ways using a diode check
while im on the subject, c-band lnbs may read different, i have not had enough experience with them to know for sure.
it is possible that other things can go wrong with them that this test will not check
(frequency drift, oscillation, and moisture getting inside to name a few)
but in 9 years, i have never seen a ku lnb that passed this test not at least work a little bit.
if it reads shorted both ways or open both ways with a diode check, you know its bad.
hope this helps,
Denny