Need Help

I've got a bit of a problem with my JVC TV model #AV-27S33, the TV was bought about 2 years ago and a couple of weeks ago it lost programming. My cable channels show up from 48 through 99, but cable channels 3 through 47, we aren't able to program them into the TV channel box, and all of the channels were showing up before now. I've gotten out the manual and read it front to back thinking there would be something there to help me re-program all of the channels, but still nothing changes, it's almost like they've been deleted. I've also moved my cable line to another TV in the house and all of the channels (3 through 99) work on it. So what could be the problem? None of the channels have the parental locks on them either. Can this problem be fixed or should I seek out getting the company to furnish another TV to me? Please advise, thank you

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