If you are using this type of input there are some possibilities for this kind of problem. Either you have a defective cable, a loose cable or a broken input or output jack.
First step is to bring up the customer menu. Do the colors appear normal. If not it’s time to call service.
If you have other products hooked up check them for proper color response. Proper response of an antenna, composite video or S-video input would infer that your color problem is unlikely to be the display. Other RGB component analog inputs can also be checked and proper operation of those would infer even more that your color problem is unlikely to be the display.
A quick check is to select the problem input, access the customer controls and turn the color all the way down. If you have a good black and white picture then physically inspect the RGB component cable connections at the source and at the display. Make sure they are plugged in and fully seated to the correct colors. You may have just found your problem. Make sure you return the color control to the correct position so you can get color!
RGB component analog cables are not based on the RGB video standard although they do share the same color scheme. The labeling on your TV will say YPbPr. Y is the green color and represents the luminance or black and white video signal. Pb is the blue color channel and the jack is colored blue. Pr is the red color channel and the jack is colored red. Nearly all component input and outputs follow this scheme. The color of the wire only serves to make connecting your equipment easier.
Depending on the design of your TV you can hook up just the green wire or Y channel and get a black and white picture. Some TVs are designed to check and see if a cable is connected to all three jacks and if not you can’t even select that input. This is easily overcome by grabbing any loose cable and simply plugging them into the red and blue jacks so you can select that input.
At this point you likely have a black and white signal since your complaint was color.
Now hook up just one color signal. You should get color but it will be the wrong color. If that passes, disconnect it and hook up the other color signal. You should get color but it will be the wrong color. If connecting either of the color channels does not give you a color response then either the cable, display input jack or source output jack is defective.
If you get at least one color channel to respond then connect it to the other color channel on the TV. If not then that jack is defective and it is time to call service. If you get a response then the input jacks must be OK. Connect both color channels to the correct input on the display. Go to the source and just like the display check for a color response at the source by connecting just one color at a time and if it does not work connect that same cable to the other color channel and see if that works. If you can’t get a response at all then that cable is defective; perform the same test with the other cable to confirm proper operation. If only one color output jack responds then the one that does not is defective.
The key to understanding this procedure is that you are not looking for correct color, just a color response. The only way you will get correct color is if both color channel cables are working along with the color output and input jacks.
This is typically caused by the grounding portion of the component cable plug not being tight enough to remain physically seated on the jack slipping out or completely off. Cable and satellite providers are notorious for providing these types of cables. A band aid solution is to reroute the cable so there is no stress on it to pull it out of the jacks. The permanent solution is to purchase a better cable where the plugs seat firmly onto the jacks.