Re: display is 1/3 lighter on bottom

There has been no damage to the iBookG4 that i have been using for about a year; but suddenly, the screen comes up with the bottom third lighter than the top. When I jiggle the screen a little, some black and white lines appear and disappear, and if i raise the screen to a certain level, sometimes the brightness evens out. Also, the longer the unit is in operation, sometimes the more even the brightness level becomes. Is this the lcd or the cables? How can i test to see? Any help will be greatly appreciated...Thanks in advance.

Welcome to Apple Discussions!
One approach would be to hook up an exterior display and see if it exhibits any of the same artifacts. If it does, there might be a problem with the video chip itself. You can also run the Apple Hardware Test to see if anything shows up in the form of an error code.
However, from your description, it sounds like the image is affected by the position of the display, which would make it sound like the problem could be with the cable. If you don't move or touch the display, what happens? Does the problem slowly go away as the machine heats up, or do you have to adjust the display to get the problem to change. When you "jiggle" the display, are you moving it by the edge or are you putting any pressure on the display itself by pinching it with your fingers?
If the problem seems to be related to the position of the display, with no pressure applied to the display itself, and the problem does not appear on an external display, then it seems likely to me that the problem is with the cable.
Hope this helps!

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