Akai PDP4294LV1, Service Manual

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Vertical defect (line)
This phenomenon is due to COF IC inside short or adherence part of the Film and rear panel electrode problem.
In this case, replace the panel.
4. Trouble shooting.
This is MCM of Ctrl b/d defect. MCM can not be replaced separately. So replace the ctrl b/d.
1 line open or short
Line open or short with same distance.
MCM (Multi Chip Module)
1 line open
In case of 1 line open or short , check foreign substances in COF connector.
First blow up foreign substances with your mouth. And then if the same line appears, replace the panel.
1 electrode open