Deal with one tuner only. (They will both be the same, just keep it simple for now. Please forget tuner B for now.)
1. Are all three lnbs aligned correctly? It is simpler to initially align without the switch included. Final adjustmenst with switch in place.
1a. if you connect to directly to 28.2 LNB, and set tuner as simple, single, 28.2, do you get a signal?
1b. if you connect to directly to 19.2 LNB, and set tuner as simple, single, 19.2, do you get a signal?
1c. if you connect to directly to 13.0 LNB, and set tuner as simple, single, 13.0, do you get a signal?
Should have pointed this out earlier, your diagram (as well as my edit) are incorrect. correct orientation.
Looking from behind dish
left 13,
middle19.2
right 28.2
Looking at dish from lnb end
right 13,
middle19.2
left 28.2
1. Are all three lnbs aligned correctly? It is simpler to initially align without the switch included. Final adjustmenst with switch in place.
1a. if you connect to directly to 28.2 LNB, and set tuner as simple, single, 28.2, do you get a signal?
1b. if you connect to directly to 19.2 LNB, and set tuner as simple, single, 19.2, do you get a signal?
1c. if you connect to directly to 13.0 LNB, and set tuner as simple, single, 13.0, do you get a signal?
Should have pointed this out earlier, your diagram (as well as my edit) are incorrect. correct orientation.
Looking from behind dish
left 13,
middle19.2
right 28.2
Looking at dish from lnb end
right 13,
middle19.2
left 28.2