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Who is your cable provider? Is there a BOX on the other TV in the house? Please provide details and we can proceed.
I have Charter as well, and late last year they changed their signal over to digital- where EVERY TV in the house needs it's own box to decode the signal. Even my brand new LG and Toshiba sets won't work without a box now. This is how just about every cable company operates these days. You can't just split the coaxial cable and get channels on the Insignia set. Unfortunately you need another box to connect to the other TV.
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Do you need further assistance with this?
If not, could you please click the 5 STAR RATING, at the top of the page for my efforts? It is my livelihood and you can follow up at any time if needed.