2008 iMac 20in power Distribution information

Discussion in 'iMac' started by Richdave, Apr 29, 2010.

  1. Richdave macrumors member

    Joined:
    Mar 23, 2010
    Location:
    Outer East - Melbourne, Australia
    #1
    I have taken some measurements from my PSU and since I have not seen this sort of info posted anywhere else and it is not in the service manual I thought I'd share it here.

    refer attached

    Note ** The voltage on pin 4 varies according to the temperature of the PSU and ranges between 1.7V and 2.5V - Higher voltage = lower temperature.

    Hope that someone finds this useful :D
     

    Attached Files:

  2. Phantom Gremlin macrumors regular

    Joined:
    Feb 10, 2010
    Location:
    Tualatin, Oregon
    #2
    I won't find it useful, since I'm not about to disassemble my iMac.

    But that's what's great about MacRumors. I'm sure there are many people here who will find your information useful.
     
  3. Richdave thread starter macrumors member

    Joined:
    Mar 23, 2010
    Location:
    Outer East - Melbourne, Australia
    #3
    PSU wiring loom

    I have put together some info on the PSU wiring loom too.

    All care taken, but no responsibility if I have made an error. Use at your own risk :D

    Pin 1 on the PSU is assumed to be the pin with the DOT indicator on the PCB - refer first post

    Pin 1 on the Inverter connector has a Δ pointing to it

    Pin assignment for the MLB connectors are assumed to conform to the "Molex" pin assignment convention. I could not see any indicators or markings on the MLB or associated connectors to confirm this though. - EDIT The solder side of the board has a square pad for what I believed to be pin 1 so I am more confident that I have it correctly assigned

    The HDD SATA power pin-out details can be found HERE
     

    Attached Files:

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