Apple Self Repair Guides

Replacement Procedure Pku

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1. Verify that the Mylar and rubber blocks are installed or transfer from the replaced board.

The following procedures show how to replace the thermal materials:

Warning: Whenever the logic board is separated from the heatsink, the thermal grease must be replaced. Failure to do so can cause the computer to overheat and be damaged.

When removing thermal material:

• Use a black stick to remove as much thermal grease as possible
• Use an alcohol wipes to clean the mating surface.

Important: Avoid unnecessary contact with new thermal material, as dirt and body oils reduce the thermal material's conductivity.

4. Put a 0.3cc daub of thermal grease (922-7144), in the center, on both the CPU and graphics chip mating surfaces, as shown below.

Note: One syringe of the thermal grease contains about 0.2 cubic centimeters (cc). So using about one and a half syringes should be needed per pad. If in doubt, use the picture below and apply a similar amount.

5. Verify that the center thermal pad is in place and in good condition. If not, replace the heatsink.

6. If the logic board was removed to facilitate another procedure and will be reinstalled, use a black stick and alcohol wipes to clean the thermal grease from the CPU and graphics chips:

Important: Use extreme care not to damage the chip or logic board components.

7. When replacing the logic board:

• Verify that the right speaker chamber is installed.
• Verify that the right USB board is installed.
• Install the modem flex cable onto the logic board before installing the board.
• Guide the logic board's port side into the port openings on the bottom case.
• While lowering the board, connect the two cables that go under the logic board on the left side.
• Verify that no cables are caught under the board when lowering into place.
• Install the metal washer on the replacement logic board when securing its screw.

8. Attach the screws in the order shown.

922-6473

922-6473

9. Reassemble and test all ports, components and functions of the computer.

Note: After installing new thermal material, if you must briefly re-separate the logic board from the heatsink, it is OK to retain the same, new thermal material, as long as they are not handled excessively.

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