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What's the model number off of the back of your TV? What's the brand and model of the cable box? This info is needed as right now there are no specifics posted regarding what equipment you have.
What remote have you been trying to use to fix the captions- the original TV remote or the cable remote?
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Okay since you're not replying I will opt out.
Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, re-confirm and post back with the complete make and model number of the "... cable box is an Xfinity (Comcast) DTA unit..." Additionally, please describe how the cable box is connected to the TV using what kind of cable(s).