Can I fix it? Would I be better off buying a new TV? ?

Hello, I own a Panasonic PL-52LCX35 LCD, projection television. I have been having ongoing problems with this TV for 2 years now. It started out with a couple of colored dots on the screen of the television. As time passed the dots multiplied, doubled in size and the color became very distracting. Then, more recently there have been lines on the screen. At first the lines just blocked out half of the picture, but the lines now block the whole screen to the point where the picture isn't visible at all. I have already replaced the lamp so I know that that is not the problem with my projection television. So does anyone know how to fix this if possible??? Would I be better off just buying a new television??? thank you, Kurt