I did the following my Polaroid tv-dvd combo. The code that worked was 10765. It worked the first time and then the remote quit working. I did the following - on the Comcast DTA - I switched the switch from 3 to 4 and back to 3. The TV was itself on channel 3. After that I used their setup instructions and entered 10765. That corrected it. I was glad since I spent over an hour to get it right.
The DTA setup is on the comcast website [Link: comcast.com]