Ok great. Glad the Mac Portable doesn't have those issues...

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I had the exact same thought when I was looking into this issue. The oldest one amongst all of them doesn't have the issue, yet all the subsequent monochrome/grayscale active matrix panels in the portable/powerbook family do. I wonder what the difference is?

I would like to add. I have a powerbook 180, my screen had the same issue. I bought a screen from another member on this forum that was tested in his powerbook 180 for hours and the issue did not occur. I got the screen, didn't have a chance to install for 6 months. When I did swap the screen with mine, the new screen had the exact same issue.
This leads me to believe the problem is seperate from the screen itself, somewhere in the lower section of the laptop.

My thread:

http://68kmla.org/forums/viewtopic.php?f=4&t=21754

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That is an interesting finding. That would be quite something if it turned out to be an issue with the circuity in the system rather than in the LCD itself. However, if it was in the system itself, wouldn't the other types of screen suffer from a similar fate? What makes the grayscale active matrix susceptible?