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Re-apply thermal paste to PB

This is after about 45 minutes or so of an average workload. Temps honestly haven't changed that much, but the old paste was drying up (it's been 10 years!), so it would have become an insulator, which is obviously not good!
 

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jrsx said:
This is after about 45 minutes or so of an average workload. Temps honestly haven't changed that much, but the old paste was drying up (it's been 10 years!), so it would have become an insulator, which is obviously not good!
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What was it after 45 minutes with the old paste?
 
I'm also going to dig into my iBook G4 and replace the pads with paste. Does anybody know a good way to do this? On desktops they say to put a rice sized drop on and twist the heatsink, smearing it evenly. My iBook obviously has very tight quarters and you can't spin anything but a CD. Should I just smear it? That's what I did on my PB but I have read that this is not the best approach. Thanks.
 
It generally isn't a good idea to replace a heatpad with paste. The pad is there because the gap between the two parts is too great to be crossed with paste at a workable amount.
 
jrsx said:
I'm also going to dig into my iBook G4 and replace the pads with paste. Does anybody know a good way to do this? On desktops they say to put a rice sized drop on and twist the heatsink, smearing it evenly. My iBook obviously has very tight quarters and you can't spin anything but a CD. Should I just smear it? That's what I did on my PB but I have read that this is not the best approach. Thanks.
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If it came with pads keep pads. If it came with paste use paste.
 
I know not putting in a pad or shim, but only paste will cause a 12" Powerbook to overheat very quickly.
 
Altemose said:
What is more important, spending $5.00 on pads or risking your Logic Board.
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I just finished replacing the pads on my GPU and NorthBridge and re-did my original thermal paste job on the CPU. Temps didn't really change that much, but I feel safer now that everything is in it's correct place.
The GPU is idling at around 120 F and the CPU at around 105-110 F
 
jrsx said:
I just finished replacing the pads on my GPU and NorthBridge and re-did my original thermal paste job on the CPU. Temps didn't really change that much, but I feel safer now that everything is in it's correct place.
The GPU is idling at around 120 F and the CPU at around 105-110 F
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Good. I only would recommend changing the pad for paste on a 15 or 17"
 
I did have one question about replacing the pads in my iBook. The CPU die and the GPU core are as pictured (below): not very big and only cover the center of the chip. Should I just cover the die/core with a thermal pad? Or cover the whole thing with thermal pads? The pads I purchased are about 15mm x 15mm.
P7050085.JPG

P7050084.JPG
 
If it has a pad, replace it with a pad. Never put just paste or it will overheat. See here why you should never replace a pad with paste. Even on a 15" or 17" Powerbook, it is a very bad idea.
 
Intell said:
If it has a pad, replace it with a pad. Never put just paste or it will overheat. See here why you should never replace a pad with paste. Even on a 15" or 17" Powerbook, it is a very bad idea.
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Sounds great. If I replace my iBooks pads however, should they cover the whole chip? Or is it ok if I just cover the dye like with paste?
 
Upon furthur use of my PowerBook, it seems the temps have actually dropped, which I did not think they did. They've gone down about 5 degrees idle, and seem to maintain a little lower on a workload than they did before, as well. I also didn't spread the thermal paste on the CPU this time, instead put a rice-sized drop and simply put the heatsink back on. I did however wiggle it a little and push down on it a couple times to help spread it under the heatsink. Just some tips for anyone else doing this same task.
 
So far the thermal pads in my iBook have been doing great! They seem to keep temps several degrees lower than the old ones.
 
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