iMac G4 1.25 ghz

Discussion in 'PowerPC Macs' started by okawa, May 22, 2017.

  1. okawa, May 22, 2017
    Last edited: May 22, 2017

    okawa macrumors newbie

    Feb 19, 2017
    I have 17" and a 20" 1.25 ghz iMac G4s. I'm about to reapply the thermal paste. I think I understand that.

    Does anyone have experience replacing the thermal pads on an iMac? Are they under the logic board? Is it relatively simple to do?

    Also will be replacing thermal paste in a DLSD PowerBook G4 17". According to this website, there are no thermal pads in this highest end model. If someone can confirm this.
  2. CooperBox macrumors 6502a


    Nov 28, 2010
    France - between Ricard & Absinthe
    Regarding thermal pad beneath the logic board, there is one. Replacement takes only minutes once the logic board has been removed. See following photos:

    General view with logic board removed. Thermal pad is black (with white bluetooth connector lying on top).


    Below: Detail of thermal pad. Unused blutooth connector had been misrouted during a previous assembly and compressed into the pad. :eek:


    Below: Thermal pad just prior to removal. This was replaced by similar 1mm pad material (blue) purchased via Amazon.


    The original pad was measured and found to be approx 0.8mm, so allowing for compression during previous use, I figured 1.0mm thickness was a suitable pad thickness for new replacement. As I was so keen to re-assemble the iMac I didn't think to take a photo of the new pad following the change.
    Everything worked fine as a result, (as it did before I started), as this was just a general refurb and internal cleaning - which these G4 iMacs need from time to time if in use fairly regularly.

    Let me know if you have doubts on exact location for thermal paste (same on the models you refer to, but different on earlier iMac G4's). I have some photos if required.
  3. okawa thread starter macrumors newbie

    Feb 19, 2017
    Thanks. Good to know someone else has replaced the pad. I usually see people just replace the paste and forget about the pad. Luckily I've already ordered 1mm thermal pads.

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