Note: Some of these photos are taken from the original iMac G5 logic board take apart since the procedure is very similar.
1. At the top of the logic board, near the fan, disconnect the two fan cables and the two hard drive connectors.
3. Disconnect the hard drive thermal sensor (near the memory slots) from the logic board. Leave the other end of the thermal sensor attached to the hard drive.
4. Using a T-8 screwdriver, disconnect the two fan duct screws and lift the duct off the logic board. Note: These two screws are longer than the other silver screws securing the logic board to the midplane chassis.
6. Disconnect the two connectors (microphone and speakers). Note: Pull on the connector, not the cables.
8. Using a T-10 screwdriver, remove six silver logic board screws and with a Phillips #2 screwdriver, remove the three brass screws on the logic board. Note: The numbers are for replacement order, disregard for take-apart.
11. If you don't see the light pipe on the back of the logic board, it may be stuck in the chassis (shown below). Use a needlenose pliers to remove the light pipe.
12. Return the logic board to Apple in the packaging provided.
1. Locate the cleaning wipe and syringe in the replacement logic board box.
Replacing the Logic Board
1. Locate the cleaning wipe and syringe in the replacement logic board box.
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2. Clean the copper heatpad (circled). Use the alcohol wipe to clean the copper heatpad.
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2. Clean the copper heatpad (circled). Use the alcohol wipe to clean the copper heatpad.
3. Whenever you remove the logic board clean the U3 chip (circled) and reapply thermal grease.
4. Add 1 1/2 to 2 syringes of thermal grease to the U3 chip to ensure sufficient cooling. Spread the paste evenly across the surface of the chip.
Locate the light pipe gasket on the replacement board. Peel the adhesive backing off of the gasket.
10. Using a T-10 screwdriver, replace the six silver torx logic board screws. Use a Phillips #2 to replace the three brass screws. Note: Make sure the hard drive cables are not obstructing the screw hole at the top of the logic board.
14. Using a T-8 screwdriver, connect the two fan duct screws. Note: These two screws are longer than the other silver screws securing the logic board to the midplane chassis.
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