LN55C650 Colored Lines
For anyone that has this problem. Here is what I did to solve this problem, without any money involved. I was getting the colored lines like other samsung models, So this may help you isolated the problem. Tapping on the back of the TV helped me to realize that the Main Video Board might be stress in some way. First I unplugged the TV, and all cables. Removed the back cover and plugged the TV back in. That helped. But still didn't solve it fully. Then I loosened the 4 screws that hold the Main Video Board just enough that there was side play. NO LINES YET. Most likely the TV frame is bending the Board. Samsung even puts a screw for the cover going thru the Main Board. Removing just the screw at first helped but no fully. So give it a try.