I'm sorry to hear this! Have you tried putting in the exact model code of the cable box during the universal set up?
Regards,
HD Tech
I have a Samsung 55" smart TV model no. UN55H6203AFXZA. I programmed my cable box with the IR extender and the remote is not fully functional. For example I can change channels but I can't turn the cable box on or off. Or if I bring up the guide and select a new channel it goes back to the channel I was previously watching. The cable box is a Scientific Atlanta Explorer 8300 HDC. I've tried programming 3 times.

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