I assume that these lines are there, in the same position, whatever the source of the signal.
Those lines appeared because the corresponding columns of pixels aren't correctly commanded. This can happen from 3 causes:
1 - the connector from the video board to the plasma panel is loose or broken - attach it thoroughly or replace it, a cheap part.
2 - the video processor is malfunctioning - unfixable by itself, the entire board must be replaced, it will be expensive
3 - the paths corresponding to those columns from inside the plasma panels are interrupted - nothing can be done to fix that.
To determine which is the cause the tv must be thoroughly tested by a professional.
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