Hyundai HTP4240 fault (LG PDP42V6 chassis)

[ProDave]

First time repairing a plasma, lots of CRT and LCD experience but first plasma, so can you point me in the right direction.

This old Hyundai set uses all LG PCB's except psu board and uses an LG display panel.

The fault as best as I can describe it, is every vertical pixel shows the same.  So for instance select an AV source with no input connected, instead of just seeing the text describing that AV input in the corner of the screen, you get solid bands right down the screen where every character would be.

Any clues where to look? is it likely to be a repairable fault, or a dead panel?