2nd generation iMac G5 is suddenly pixellating

M 2nd generation iMac G5 is suddenly pixellating to the point of unreadabilty after being on for a couple hours. If I turn it off and let it sit for 10 or 20 minute sit starts ok again. My serial starts with YD531 . Is this likely to be capacitors and how hard is that to fix. I am used to soldering , but not electronics. The computer was worked on twice with power problems while under warranty.

Hey b'trout,
pixellating to the point of unreadabilty after being on for a couple hours. If I turn it off and let it sit for 10 or 20 minute sit starts ok again.
Now while this could be capacitors and is usually the first thing you think of in these machines. (Easy enough to check, just pull the back and look at the caps) If you're not sure what the problems look like:
http://jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php
Now in your case I'm thinking that it has to do with temperature of the graphics chip. I just repaired my Power Mac G4 dual 1.2 MDD which was doing exactly what you describe. When I pulled the graphics card the chip to heatsink thermal past was dried out and brittle. Cleaning it up and reinstalling new paste fixed the problem.
Now the iMac is different in that there are thermal transfer pads that move the heat from the GPU (graphics processor unit) to the heat sink. The heat sink is of unusual design and my suspicions if you read through this post:
http://discussions.apple.com/thread.jspa?threadID=2559193&start=0&tstart=0
is that they fail. I know of no way to test them or tell if they are failing. My thoughts on possibilities are in that post.
The other thing that would help in a diagnosis would be if there was a temp sensor on the GPU, which there doesn't seem to be. (This iBook G4 I'm on has 5 sensors according to Temperature monitor. The iMac only two)
The only test that comes to mind is to run the iMac with the back off. Then you'd have to remove the upper plenum cover and blow cold air on the upper part os the plenum. If that prevents your failure you have a faulty heat pipe.
You can email me for more info.
Richard

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