Colour has screwed up

Hi i have a samsung, i think its called the progressive, it is 42 inch and has rear projection. after suffering a little bit of a knock the colour has messed up . there is a blue line that protudes downwards in a semi circular shape from the top corners. this means that writing on the screen is overlaped by another picture in blue. is there any way to fix this or is the tv wrecked. within the blue shape at the top is another yellow semi circular shape.