LG 60PG3000

[SlyAKs]

Had a look at one of these today for a friend.. There was one black 2 inch vertical bar running down the screen.. My mate said that the fault was intermittent, so I naturally thought one of the ribbons weren't connected properly or had contaminants on it.. Cleaned them all with alco and reconnected them.. Bar was gone... After a while (30 - 40 mins or so) the bar came back.. Is it looking like buffer boards are needed? Any info would be greatly appreciated.. steep learning curve these tv's! Lol