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Hi , I`m JackPerhaps I can help you with this problem , a few questions coming up and please note that it may take a few minutes between replies;
What is connected to this tv beside the cable box do you have dvd,games etc. ?
How did Comcast determine it was not a cable box problem from their office ?
Or did they come to your home ?
This is not a valid Panasonic model number by the way , it usually starts like TC-P..... , TC-L......