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Deze versie is geschreven door: ptoll ,

Titel:

Is distorted display due to cable, LCD panel, video driver, or other?

Tekst:

'''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 itthe problem might relate toactually be with 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 itthe problem might relate toactually 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!!'''

Apparaat:

PowerBook G4 Aluminum 15" 1.5-1.67 GHz

Status:

open

Origineel bericht door: ptoll ,

Titel:

Is distorted display due to cable, LCD panel, video driver, or other?

Tekst:

'''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!!'''

Apparaat:

PowerBook G4 Aluminum 15" 1.5-1.67 GHz

Status:

open