monitor jitter several weeks ago i described a problem with my apple high resolution monitor and promised to summarize replies received by e mail to recapitulate occasionally every two or three hours or so my monitor momentarily loses sync the entire raster image bounces down about an eighth of an inch or so then rights itself this usually happens right after i close a large window highlight a large area or do something that radically alters the image on the screen sometimes though it happens with no provocation whatsoever i have received a bewildering range of replies at one extreme was a man clearly quite knowledgable about monitors who said that the problem was that the monitor s power supply simply couldn t always keep up with sudden changes of the raster image the rapid change from a largely light screen to a largely dark one overtaxed the monitor s power supply there was no fix available he said because nothing was really wrong i guess he meant that the flaw was so fundamental that it had to be endured this seemed quite persuasive and i would have been tempted to adopt an attitude of stoicism except for a reply from a monitor owner who discovered that this very problem is documented in the apple service technical procedures volume under the heading jitter correction the section describes a fix involving the replacement of a capacitor the adjustment of a potentiometer or failing that the swap of a circuit board i would be grateful for a discussion among those who have had experience with this sort of thing
