If the tv is not hd then the control is on your tv.
However if the comcast box is an hd box do the following;
Press cable, then power and then with 2 seconds press the red menu button to get the hidden hd user setup menu. You may have to hit the menu button multiple times to get the menu to stay up on the tv.
Next go down to closed captions which is probably enabled, and hit the left or right arrow key to change it to disabled.
Then press the power button twice to turn the box off and back on.
Dale
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