Powerbook G4 17" screen defect
- Thread starter schneman
- Start date
Hi schneman
You say it depends on the angle, so if you tilt the screen the area affected will change? This could mean the cable...
If you take a screenshot with Mac OS X, are these graphic errors ever present?
Do you have the install discs that came with this Mac? There is Apple Hardware Test on disc. Boot from it, hold down alt/option key (however it is marked on your keyboard) and select the hardware test, then the language, and hit ctrl-L to get it to loop mode. Run extended test for a few hours. It will stop if it finds an error (so it will test graphics, MLB, processor and RAM etc which are the other options for this) and it will show the error code, or if everything is clear it will stop when you hit ctrl-L again to quit the loop.
You say it depends on the angle, so if you tilt the screen the area affected will change? This could mean the cable...
If you take a screenshot with Mac OS X, are these graphic errors ever present?
Do you have the install discs that came with this Mac? There is Apple Hardware Test on disc. Boot from it, hold down alt/option key (however it is marked on your keyboard) and select the hardware test, then the language, and hit ctrl-L to get it to loop mode. Run extended test for a few hours. It will stop if it finds an error (so it will test graphics, MLB, processor and RAM etc which are the other options for this) and it will show the error code, or if everything is clear it will stop when you hit ctrl-L again to quit the loop.
Hi Giaguara,
Many thanks for your help.
You are right, when I tilt the screen the color changes and flickering appear and disappear. The greyish shadows stay independent of the screen angle.
I attach a screenshot which shows the shadows and some ghosting but the flickering and color changes do not appear.
I ran the advanced tests with Techtool Pro 4 but did not get any error.
I tried squeezing the edges of the display gently to see if I can stimulate the problem as I understand this could be a sign of LCD edge connection failure. However, that does not do anything.
The flickering and changing colors seem to point to a failing LVDS cable but I do not know what to make of the shadows.
Many thanks for your help.
You are right, when I tilt the screen the color changes and flickering appear and disappear. The greyish shadows stay independent of the screen angle.
I attach a screenshot which shows the shadows and some ghosting but the flickering and color changes do not appear.
I ran the advanced tests with Techtool Pro 4 but did not get any error.
I tried squeezing the edges of the display gently to see if I can stimulate the problem as I understand this could be a sign of LCD edge connection failure. However, that does not do anything.
The flickering and changing colors seem to point to a failing LVDS cable but I do not know what to make of the shadows.
Attachments
DeltaMac
Tech
grey band? I don't see it at all. There's a slight darkening of the bottom third, but that seems to be a function of the background that you are using, and doesn't appear to affect the Safari window that extends into that area in your screen shot. How does it look when you have a single color background? - such as a light grey?
Anyway, your screen/cables need repair. You can see the 'real' screen by connecting an external display.
Anyway, your screen/cables need repair. You can see the 'real' screen by connecting an external display.