cleaning the microprocessor

Discussion in 'PowerPC Macs' started by ceren, May 18, 2010.

  1. ceren macrumors newbie

    May 18, 2010
    hey guys,

    I have an eMac 2002... I am trying to clean the heat sink and the microprocessor on my logic board so that I can apply new thermal paste. I heard to use 90% alcohol, anyone who tried it?

    Another thing, I know this is for iMac and Mac minis but maybe some of you had an eMac before... There is a film on the microprocessor covering the whole square like a thin clear plastic one, does that come off before the new thermal paste or not?

    And also my optical drive carrier again from the older eMac like all has a metal heat shield. The service manual calls for a cotter pin to hold it in place. I do not remember having a cotter pin there when I was disassembling it. However there is this plastic pin I found on the floor that may have popped without me noticing while I was taking it off. It looks like a screw but plastic without the threads instead a pop in type of kind. Any clues? Can this be the pin?
  2. snsr macrumors member

    Aug 12, 2008

    I don't know about the film, but you should use isopropyl alcohol 92%, or as high a percentage as you can find. Use a clean paper towel, wipe as many times as it takes to get all of the old paste off. Blow off fibers from the towel. When applying new paste, a little goes a long way, and too much can be bad; generally no more than the size of a grain of rice.

    Is the plastic sheet applied like one over the screen of new phone, etc?
  3. dvdhsu macrumors 6502a


    Mar 28, 2008
    Palo Alto, CA
    I recommend a coffee filter, I hear those are nice.

    As for type, it really doesn't matter that much, the lower the percentage, the longer you should let it dry, that's all.
  4. KeriJane macrumors 6502a


    Sep 26, 2009

    Apple, like most other computer manufacturers uses a wax-based heat transfer compound that is a real pain to remove. At least on some of their systems. I can't speak for your eMac.
    Alcohol usually won't work very well.

    Arctic Sliver makes an excellent thermal material remover called ArctiClean.

    Plain old "Goo Gone" and other citrus-base cleaners seem to work just as well.

    After using Goo Gone, be sure to use strong alcohol to clean off the citrus cleaner.

    you probably want to check the finish of the heatsink and CPU. The CPU is probably very flat and smooth but the heatsink possibly isn't.
    If the heatsink has a relatively rough extruded finish, don't use a "thin" heat transfer compound. Use a thicker paste compound or lap the heatsink surface flat and smooth.

    Good Luck,
  5. ClassicII macrumors 6502


    Sep 21, 2009
    Chicago, IL
    Yes you want to use the highest % alcohol you can find. Also you need to use a lint free cloth to clean the surface clean so you dont leave anything behind.

    If you can get that pad off and the heat sink and processor square clean you can then apply a small amount of a good sliver paste.

    Remember once applied it depends on the kind of paste you bought but most need a 72-hour burn in time to help it set right. So just leave you emac on a few days and dont let it go to sleep and you should be good to go.

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