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- Have you tried to unplug TV and cable box power cords from wall outlet for 10 minutes to reset, replug back in, let cable box reboot that may take several minutes and check?If not yet, please try it now and reply back with the result.
Do you use cable remote to change channels on TV?
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OK, this means cable box is device where channel signals are being processed and TV has nothing to do with it, cable box is video source like any other video device such as DVD/Bluray player and TV is being used as Monitor only to present the picture and sound that comes from cable box.
In my opinion, your cable box isn't processing those missing channels for some reason ad if you switch the TV, other TV will show you same thing.
Is it possible to switch the cable box with other one if available to confirm above diagnosis?
I mean connect another cable box, that shows desired channels, to this TV as a test?