lg vertical line

[mzone]

Hello, we have a lg plasma LG RZ-42PX11 in for repair I just notice there is a black vertical line down the center from above i have .resoldered the 4 x resistance 100 ohm resistors on the pdp COF flat ribbon in case of cold solder joints. & does not seemed to have helped as tv still has black vertical line. anyone help?

thankyou