Yes there is sound and picture.
However taking the home theatre out of the system also removes the need for the RF modulator. With that connection I have sound from the home theatre, but no picture; and there is sound and picture from the TV.
Installing the RCA cables as you suggested has no effect.
I have connected the DVD player from the home theatre to another TV and it plays sound and picture.
I think there is something wrong with the way I'm connecting the coaxial cables.
This is an old TV with only one coaxial input. The RF modulator is required in this set up so to can be connected to the old TV.
Here's a drawing:
That's the cable box alright. I have things hooked up as you suggested. I made a mistake in my diagram to you. There is no coaxial connection from the RF modulator to the DVD player.
CABLE BOX (use #7 output above) --coax cable----> RF modulator----->co ax--> TVadditionally: on the RF modulator, connect the yellow, red, and white connections to the CD/DVD player.worked.
It probably works the way it's supposed to, but it's not the way I thought it should. Thanks a lot for your help.