You might try posting your question on the Comcast help and support forum. Be very specific about what the model number is for your Comcast remote and TV remote. To be specific the remote "Talks" to the TV not the other way around. I personally find it easier to use both remotes because at best the Comcast remote cannot duplicate all the features of your TV remote.
here is the link to the forum. You will need to join and create a password etc. You will find a lot of help at the forum about every Comcast product TV, high speed internet, E-mail, security and so on.
http://forums.comcast.com/
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