a few months back, all the SBS channels disappeared from my DSE "G7659" standard def STB. So, I rescanned the whole band = no change, so I opened the unit and gave it a clean and service = no change.
Must be faulty tuner, I thought - no biggie as my main (flat screen) picks up all channels fine.
Last night, a neighbour's STB went dead so I loaned them mine and apologised for the lack of SBS. Then I pulled my spare DSE box out of storage and found it too had no SBS despite also being rescanned.
Two faulty tuners ? That IS very fishy.
After about 30 minutes Googling, I finally found that SBS in Sydney has moved frequency right back to VHF !! All the previous UHF signals are now on VHF channel 7 - nominally at184.625 MHz.
So WTF is wrong with the two DSE boxes, why can't they see the new signal ?
I had not tried the "manual tune" function until just now, cos you need to know the frequency ( or channel number) of a transmitter to use it.