"Hi Josh, I know this is old news but I'm clutching at straws. Just put a new tv Panasonic FS500, at the Bach to replace a STB and old TV. Have tried what i can, changing the LNB numbers from 11300 to 10750 and back, changing from Optus D1 to D2…"
"In the tuning menu, there is an option to edit the LNB settings, its quite possible the TV hasn't picked up the correct frequency, the FREQ should either be 10750 or 11300. Try either and rescan again to see if channels pick up.