The TV will not display closed caption with HDMI input. It must either over-the-air (antenna) or composite input for the TV to manage CC.
To get CC with HDMI from your Comcast DVR, you need to configure the cable box. Instructions can be found here:
http://en.wikibooks.org/wiki/How_to_use_a_Motorola_DVR/Setup
If you want CC all of the time, this works well. But since you must power-off the cable box to change the setting, switching CC on and off is a real pain.
Your set-up is similar to mine (Sharp Aquos 46" and Comcast DVR). I have the composite output from the cable box going to a DVD-recorder and on to the TV. Whenever I need CC (usually to catch some mumbled dialog), I just rewind the DVR, and switch the TV input to the composite input. Then I switch back to HDMI to continue watching in HD.
put control captions on sharp tv
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