I have a Sony KDL-52W4100 52" LCD thats about 2 years old. Recently it developed a problem with the display, there are 6 horizontal lines with garbled pixels, 3 about 6 inches long and 3 about 3 inches. Pics below. The lines are there regardless of source (hdmi DVR, coax, component DVD, etc). Any idea what has caused this and how to repair it? Thanks.