I have seen panel failures with wide vertical bands. The vertical sections are fed by flex connectors TAB (Tape Automated Bond) bonded to panel boards at the bottom of the TV. TAB bonding uses expensive specialized equipment and ripped connections are not economically repairable. The flex connector could also contain an embedded COF (chip on flex) IC. If the IC fails, there could be artifacts within the vertical band. If the flex is completely ripped off, the corresponding vertical section will be dark with no signal. Liquid (such as windex) trickling into the bottom of the bezel can also damage the panel boards. Random single pixel vertical lines are also panel damage and not repairable. You can google the Sony Tcon Training Manual to see examples of other panel failures.