Is distorted display due to cable, LCD panel, video driver, or other?
crwdns2934249:0crwdne2934249:0:
'''Problem observed:'''
• Onset of the problem was instantaneous and occurred while I was simply looking at the display, without touching the computer.
• The display shows normal and distorted colors at the same time: in some places bright green exchanged for black, purple for white, etc. Color positions don't change unless a window is opened or the window/menu arrangement changes.
• Windows are continually surrounded by "splash rings," similar to what you see when you open a widget in Dashboard, but frozen in one state.
• Strangely, I can sometimes see the (color-distorted) contents of one window showing through the background of another window that's in front of it, even though those same contents cannot be seen while observing through Screen Sharing.
• Faint "dancing" horizontal lines are barely noticeable in the brighter parts of the display.
• Component colors seem to have their rasters displaced relative to one another, like a color comic strip that was not registered properly when printed.
'''Screen Image'''
Note that some text was visually edited out for privacy.
[image|82117|size=thumbnail]
'''Other observations'''
• Windows, menus, and backgrounds seen through Screen Sharing are all perfectly normal.
• I have not yet tried an external monitor -- hopefully I'll have one set up today.
'''Steps taken so far'''
• Reset PRAM -- no change.
• Reset PMU/NVRAM -- no change.
• Booted from separate system on external drive (to detect possible corrupt system color table or other system software problem) -- no change.
• Shined light through Apple logo with the internal backlight lamp turned off. I noticed same color distortion problem (so it seems that the backlight is not the problem).
'''Suspicions'''
-
Having read other trouble reports here related to displays, I suspect that the display cable is the most likely problem, though I am concerned that it might relate to the logic board or other circuitry that drives the display.
+
Having read other trouble reports here related to displays, I suspect that the display cable is the most likely problem, though I am concerned that the problem might actually be with the logic board or other circuitry that drives the display.
Finally, my questions...
• Should I replace the display cable?
• If not, what else should I do, and why?
• If so, what tips might you offer for best success?
'''Thank you for your time, interest, and help in solving this problem!!'''
Is distorted display due to cable, LCD panel, video driver, or other?
crwdns2934249:0crwdne2934249:0:
'''Problem observed:'''
• Onset of the problem was instantaneous and occurred while I was simply looking at the display, without touching the computer.
• The display shows normal and distorted colors at the same time: in some places bright green exchanged for black, purple for white, etc. Color positions don't change unless a window is opened or the window/menu arrangement changes.
• Windows are continually surrounded by "splash rings," similar to what you see when you open a widget in Dashboard, but frozen in one state.
• Strangely, I can sometimes see the (color-distorted) contents of one window showing through the background of another window that's in front of it, even though those same contents cannot be seen while observing through Screen Sharing.
• Faint "dancing" horizontal lines are barely noticeable in the brighter parts of the display.
• Component colors seem to have their rasters displaced relative to one another, like a color comic strip that was not registered properly when printed.
'''Screen Image'''
Note that some text was visually edited out for privacy.
[image|82117|size=thumbnail]
'''Other observations'''
• Windows, menus, and backgrounds seen through Screen Sharing are all perfectly normal.
• I have not yet tried an external monitor -- hopefully I'll have one set up today.
'''Steps taken so far'''
• Reset PRAM -- no change.
• Reset PMU/NVRAM -- no change.
• Booted from separate system on external drive (to detect possible corrupt system color table or other system software problem) -- no change.
• Shined light through Apple logo with the internal backlight lamp turned off. I noticed same color distortion problem (so it seems that the backlight is not the problem).
'''Suspicions'''
Having read other trouble reports here related to displays, I suspect that the display cable is the most likely problem, though I am concerned that it might relate to the logic board or other circuitry that drives the display.
Finally, my questions...
• Should I replace the display cable?
• If not, what else should I do, and why?
• If so, what tips might you offer for best success?
'''Thank you for your time, interest, and help in solving this problem!!'''