Having looked at the operating manual for the set in question it would appear that if after setting the ON & OFF times (on ON/OFF timer) and you have moved onto "CHANNEL" and you do not see A/V inputs being mentioned at either end of the total range of channel availability shown then there is the possibility that this action is not possible.

Doesn't your cable box have a programmable RF output? as if it did you then that would enable you to achieve what you want to do as the TV would look it the cable box as another station.

This said assuming that you presently have the cable box coupled into the TV via RCA plugs.

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