Step 25
Remove the T6 Torx screw from the modem filter board.
Step 26
Remove the modem filter board from the computer by pulling up and to the right.
There is a small plastic post which helps hold the modem filter board in place. You need to clear this post to remove the modem filter board from the computer.
Step 27 — Logic Board
Turn the G4 over.
Remove the seven T8 Torx screws from the logic board.
The five black screws go on the right side of the logic board, the large silver screw goes at the top, and the small silver screw is located on the left side.