Join Date: May 2002
Location: Toronto, Rogers, 9865 & 8300-eHDD, Sharp LC75N8000U, Denon AVR4310Ci; Sony KDL40W3000, 9865
TVs can only CC incoming SD signals, not HD ones, so for HD channels the STB must do the CC. I don't know the make/model of the STB, but there may be CC options available in the menu, etc.
Properly set up, the STB may be able to pass SD signals to the TV for the SD channels, and then you could have the TV do the CC.