This is often the problem when the output is set incorrectly. i.e. you are using component cables and the output of the unit is set to video or such, try looking in set up on the menu screen and see id you can change the output.
The other time I have had this happen is when the RGB plugs were in the wrong hole.
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There is a specific chip that processs color for the video output, if you are using the RCA connection or Svideo (Yellow or black cable) try the threaded tv cable. If that doesnt work it is probably not worth the $ to fix.
It sounds like the circuitry which actuates the color drives for the screen are not working, this would ba analogous to adjusting for a B&W picture on a color TV you have color but the screen shows black and white. I would get a schematic for this set and measure the voltages on the color processor that connects to the screen since you know that the external jack has color. If possible I can help you troubleshoot this, if you need me to help out.