DVB-S does not work because LNB is not setup
If you see error messages like the following in the output from mythbackend when it is started:
DiSeqCDevTree, Warning: No device tree for cardid 9 DVBChan(9:1) Warning: Your frequency setting (11836500) is out of range. (min/max:950000/2150000) DiSeqCDevTree, Error: No root device tree node! DVBChan(9:1) Error: tune(): Failed to setup DiseqC devices DVBChan(9:1) Error: setChannelByString(51): Tuning to frequency.
Then it is probably caused by the LNB not being setup for the DVB-S card. Use mythtvsetup to select LNB as DiSeqC for that card even if you do not have a DiSeqC!