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By poor color quality, do you mean that if you turn the color control all the way down, the black and white picture is more like black and red, green or blue - or do you have a good black and white image? If the B&W image is good, and the TV is an old (8+ years) one, maybe the mirror inside the set needs a good cleaning - especially if there are smokers in the room. If you have a B&W picture that is tinted, then you may have to go into a service menu to adjust it back to a better picture. Hard to guess the problem without more specific description of symptoms.
You need to check the resolution of your TV thru your input setting, try to check which will give better picture quality between 1080 or 720 settings. Also secure that your input setting as either HDMI 1 or 2 or 3, you can use the original remote and change setting by pressing input in cycle.
No HD channels on a DCT700, you have to have a HD capable box from comcast. Usually $8.95 a month for box rental. Don't know a lot about DVD players. If you get a comcast HD box, and have an HD TV, you should use an HDMI cable for best picture. Second choice is component cables. Those are the red, white and yellow or red, white yellow, blue and green cables.
It's been years but in case any poor future soul comes across this site, this is a solvable problem, if you have an older gray/silver Comcast remote. Plug the white/yellow front cables into your cable box, then the remote can be programmed using the instructions on the Comcast site for Daewoo, after that you hit the tv/cable button and viola, off line in and on to antenna!!
Try another cable box on the TV. I have seen these fail and cause problems. If the TV is okay with a DVD player, and not good on the cable service, most likely the fault is with the cable box, or the HDMI input circuit in the TV.
With the process if elimination it is possible to functionally work out where the defect is.
It is possible to have any TV fail. Both new and old sets can fail. Naturally, the older the set the greater the chance of failure, and reliability decreases with age and or use.
1st, see if you can get another cable box that offers component as well as RCA outputs on the back. Does your cable box have S Video out and does your toshiba have S Video in? If so, hook up the S Video from cable box to Toshiba. Then hook up R&W audio from Cable Box out to Toshiba In. Set the channel on the cable box to what you want to record. Set Toshiba to record channel 3 or 4, whichever your Toshiba is set on. The cable box controls the channel you are recording. You cannot set the recorder to the channel you want to record. It must be either 3 or 4. Try it. If everything else fails, you have to go cable from wall to cable in on cable box, cable out on cable box to cable in on Toshiba then either cable or RCA out on Toshiba to TV.