1. Remove the four screws connecting the fan bracket to the chassis (Faraday cage).

Powermac Logic Board Backside Picture

2. Lift the fan bracket from the chassis. Note: The fan gasket is stuck to the back side of the fan bracket.

Replacement Note: For reassembly, note the orientation of the neck cables (see below) in the fan bracket:

  • Blue Blind Mate Connector cable
  • Green Blind Mate Connector cable
  • Red TMDS video cable
Tmds Connector Imac

Warning: Whenever the bottom housing is opened for service, you must do two things:

  1. You must clean the original thermal film from all thermal interface mating surfaces, and reapply thermal paste to the mating surfaces on the thermal pipe.
  2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is firmly mated with the top base. If you do not have a torque driver, you must make sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.

Warning: Failure to follow these steps could cause the computer to overheat and damage internal components.

Refer to the topic "Thermal Paste Application" for detailed information.

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