Facing TV Problems? Ask a TV Technician.
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TV input source is where you hooked the connecting wire from cable box into, read the label of that input of TV and select it by pressing Source/ Input button on TV remote and use up/down buttons.
Lets say HDMI cable from cable box is plugged into HDMI-1 input of TV, you would need to push Input/Source button on TV remote to get source list and select HDMI-1 to get cable box video signals/ channel picture.
I hope these info will help, please let me know if I missed any point here and I'll explain it.
If there is an antenna plugged into RF Input jack of TV the then use Antenna source.
If it is coaxial cable plugged directly into TV (no box) then use Cable or Cable-Satellite as source.
I hope these info will help. If you have any additional questions, feel free to ask.