Internal screen vertical interlaced

Just out of nowhere my internal screen now and than turns out vertical interlaced. Either with black or white lines, alternating between normal screen at one vertical pixel row and a black/white line on the other. Like the interlace filter from the old days.
It's seems quite random, no heating issues or special software and the MBP is mostly sitting on my desk.
The mac keeps on functioning and the external display doesn't show the problem.
PR-ram/SMC reset didn't resolve the problem, it just stops and shows up again after a while.
Any idea's what could be wrong? I saw another post covering the same problem, but it wasn't solved.
Thanks!
Sebastian.

Hi all,
since approximately 4 weeks I have exactly the same problem like you guys describe. I already described it here
http://discussions.apple.com/thread.jspa?threadID=2765765&tstart=45
but unfortunately nobody answered. Without having "apple care" or any other guaranty, after seeing a couple of pictures from the NVIDIA BUG PROBLEM and talking to some people, I decided to replace the display. Unfortunately the problem continues.
I think it is not very likely that the NVIDIA BUG Problem is causing such an consistent imaging error like we see it on our screens. All screen shots I have seen were with more chaotic imaging errors like colored blocks or a completely scrambled pictures.
Anyway...
Even the Aplle support seems not to be able to figure out what the exact problem is.
What is with your screen shots ??? Are they OK?
My screen shots are fine and not showing this vertical interlaced pattern.
I think they are two components, other than the screen or the grafic board, who could also be the issue.
The DISPLAY DATA CABLE and the LED DRIVER BOARD..... what do you think about ?
I appreciate any suggestion,
thanks
Chris

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