I can't just switch the Roku cable with a standard composite cable, because the Roku 2 XS uses a special cable that only has a single connection into the back of the Roku.
Something doesn't sound right here. The Roku 2XS when using composite uses the standard RCA yellow cable for video and the RCA red and white cables for audio. There is no special cable for the Roku. You should be using " a standard composite cable"...(RCA yellow) into the back of the Roku to get composite picture.
What cables did you use when connecting the device to your neighbor's TV?
I used the same Roku composite cable that worked on my neighbor's TV.
When you watch your VCR and when you watch your DVD what do you set the TV on to find those devices? Do you have to watch on Channels 3 or 4 with the RF unit? Do you use your TV remote with anything other than the TV? Can you use your VCR remote and DVD remote when watching those devices?
Normally, I use the Video mode on my TV which selects the composite video input. I only configured the RF modulator to test the Roku composite signal.
You could try to eliminate the RF right now for a moment and if this works, then see how the RF can be used. Connect the Roku directly to the TV composite inputs, using the RCA cables of yellow for video, red/white for audio. Use the Video mode on your TV which selects the composite video input, and let us know what you see from the Roku.
I have tried hooking the Roku directly into the composite input on the TV with no success.
Not sure if I would say that the Roku is OK, since it is the only device that can't produce color on my TV. I believe that there is some difference in the format of the composite signal produced by the Roku vs my other devices.
There should be no difference in the format of the composite signal of the Roku vs a VCR or DVD player. They all use the same cables to output composite to your TV.
(I did ask about the remotes you could use cause it sounded like your TV basically uses the TV remote for tv/vcr signal but a dvd and the roku remotes may not be compatible with your TV remote....but I don't think that is the Roku problem right now.)
Try my suggestion above regarding a direct connection to the TV, set up as I suggested. You should get a color composite picture when you do this (it does mean you are bypassing anything to do with the RF switcher right now.) It is important to use the normal composite cables from the Roku back to your TV input.........Yellow for video and the red/white audio ones for sound.