iBook shows dozens of "dead" pixels on the screen

Hi! I've got a 12" iBook G4 1.2GHZ that has some odd pixellation on the screen...parts of the screen almost glimmer as if there was glitter reflecting in the light. I've swapped the screen, and same thing. Tried external video, same thing on the external display. PMU and PRAM, re-image the laptop, resolution and color depth changes, and it stays the same. Due to the defect showing up on the external display, I take it the problem is with the board/video chip. However, I'm intrigued because the bad pixels and pixellated areas are 100% consistently in the same place at all times, and they never move or change. I've found that video issues usually involve random elements and constantly changing defects, but this machine is totally consistent, and totally reliable other than that the screen has this situation going on. Any ideas? Thanks!

Answered! View the answer I have this problem too

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congratulations to your disco revival ibook! just kidding ;-)

are the defects exactly within the 1 pixel range or are they "clustered"?

the most video problems i've had looked like that:

Block Image

Block Image

Block Image

but some had problems only around the cursor (black vertical lines - around 1" long)

then i know defects that looked like artefacts, but they were random.

and finally - i've had kext (driver) issues - showing also some stupid stuff - but that was in the hackintosh area.

to rule out a software issue - boot from the setup disk - if this works normal, it's an hardware issue and the gpu makes some funny stuff.

the good thing is - there is a company on ebay that fixes ibook/powerbook gpu issues for 30$

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Hi Markus! Thanks for the response! Wow, your screen issues are much better looking than mine! Mine looks like someone threw a handful of glitter on the screen, so it's clumped in certain areas, and scattered in others. It's weird, too -- it doesn't show up on a white screen, but it does on the blue background. It happens on the setup disk too, so I assume it's a video chip issue. I'm wondering if the video chip soldering solution that Lemerise found would work on this...I'll have to take a look at see if the last pin on the chip is disconnected. Thanks!


you're welcome - where did lemerise wrote about that ?


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