No color

Question

The TV when turned on one day suddenly was without color. It has a good black & white picture. The color did not gradually go away, it just wasn't there. The tv is only about 3 years old. Please recommend what can be the problem and hopefully repair it at home.On some of the websites I visited it referred to the Chroma chip/circuit loose or maybe bad. Please describe what this part looks like so I can investigate it. If you have a schematic for this model that would be helpful.ThanksDiane Peel