I get picture with the transcoder hooked up, but I do not get color. I think it's an issue with the transcoder, but the seller/maker said that it is working correctly. I'll continue to tinker with it.
Ah, i took your post the wrong way. A black and white picture means Y and Sync are fine (the green coloured connector) but the colour difference channels are not. Can you get a multimerer on the Pb (blue coloured) and Pr (red coloured) plugs? Put up a bright screen of a single colour, then one of a totally different colour or even black, and the voltages on those lines should change, I believe. Obviously those aren't red and blue signal lines, but you should see some change. Also, failing a different PC VGA source at 15kHz, you could try using a different PC set to 640x480p, and very briefly plug it into the TV to see if there's any colour. That should give you an idea if the transcoder is working.
I'd love to hear what the problem actually is, if you do sort it out.