9.To replace the logic board, guide the port side into the port openings on the bottom case. Align the S-video port first.

Note: Use care not to catch cables under the board as it is lowered into place.

10.Attach the screws in the order shown.

Note: The three screws replaced first have “shoulders” and use wavy washers. Make sure that the washers do not get caught under the shoulder of the screw when installing.

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

Logic Board

PowerBook G4 (17-inch) Take Apart - 81

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Apple Powerbank G4 manual