550 Gigabit Ethernet Powerbook G4 and a 400 Mercury: I need advice on the best way to reapply thermal transfer material between the CPU and the heat exchanger. I only have this sticky white noname stuff called "cooling paste". I have yet to find a source for the green material Apple uses. The local Apple repair centre says this is what they use.
What I find hard is how to find the correct amount of cooling paste to put there. I used a small amount that I thought would be enough to cover the plate on top of the CPU. How do I verify I have enough heat dissipation? These models don't have built in temperature monitor.
There is not a word about this problem in the repair manual(s).
When I first started using this stuff (with individual transistors) I would smear it all over the surfaces involved. Then I learned the trick of applying a dab just in the middle. This stuff will spread around a lot with some pressure. In the case of an IC where the surface is more than 1/2" on a side I'd still just put the dab on, then apply the heatsink and move it around a little then check that it is covering most of the mating surfaces.
--
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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