Macintosh Compact Models: "Hourglass" Effect on Screen

My Macintosh SE/30 screen displays severe "hourglassing" when there is a large, black area on the screen. I drew a black rectangle (wider than it is high) in MacDraw and then moved it around the screen. The left and right sides of the screen closest to the rectangle squeeze in towards the rectangle (hourglassing). I have replaced everything in the unit at least once. I also removed the hard disk, but that had no effect.
The hourglass effect is common to all of the compact Macintosh computers.
It's more pronounced on some systems than on others. To reduce (but not
eliminate) the effect, turn down the internal brightness level. Try this
and experiment with other compact Macintosh computers.


Published Date: Feb 18, 2012