I went over to the Comcast store and picked up a CableCard. I stuck it in the TV and it said it had detected the CableCARD and synched the channel list to the favorites as described on the CableCARD. However, changing channels would only switch between the external inputs.

I spent a lot of time with Comcast support and Philips support trying to get it to work with both sides just pointing to each other. Finally, Comcast said they would send a tech over to get it figured out. We scheduled the appointment and then I decided to try one last time. I stuck the CableCARD back in and left the dialog up. I came back after 15 minutes and all the digital channels were there!

Now if only I could figure out a way to record those channels…