0877 or 1877
I have the same box and tv, if your remote is the same "model AT8560" there is not a code listed for Vizio, but you can do a code scan and it will program. Make sure the tv is turned on, and to enter...
The Codes for Scientific Atlanta are 4152, 413, 004, 005, or 006, depending on the model number.
What are the possible universal remote codes for a Cisco 4640 cable box
it is 538647
I'm having the same problem right now...the best thing to do is call the company.