Apple ibook g4 User Manual

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 Heatsink: iBook G4 (Early 2004)Replacement Note: When installing the 3.5-mm long screw and EMI clip at the lower 
left end of the thermal plate, make sure the EMI clip is installed as shown. 
						

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 Heatsink: iBook G4 (Early 2004) 2. Remove the two screws from the vent cover and tilt up the vent cover slightly.
3. Use a black stick to tilt up the heatsink at the left side.
4. Raise the vent cover as you lift the heatsink out of the computer assembly.
Warning: The heatsink pipe can bend easily. Use caution when removing or 
replacing the heatsink. 
						

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 Heatsink: iBook G4 (Early 2004)5. Turn over the heatsink and note the position of the thermal pads.
Replacement Note: Any time the heatsink is removed or a replacement heatsink is 
to be installed, make sure new thermal pads are applied in the following orientation:
• Smallest square pad at the top end o f the thermal plate
• Largest pad near the top of the thermal plate
• Small rectangular pad in the middle of the thermal plate
• Mid-sized square pad at the lower end of the thermal plate
Replacement Note: Make sure that the removable thermal bridge that connects the 
heatsink plate to the fan plate is in place with the single screw. 
						

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 Heatsink: iBook G4 (Early 2004) Replacement Note: Check the logic board. If any part of the thermal pads remain on 
the logic board, carefully remove them with a black stick.
6. Install the replacement heatsink, and reassemble and test the computer. 
						

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 Logic Board
Logic Board
Tools
• Soft cloth
• #0 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic tool)
Note: To organize the screws you remove from the computer, use a tray with divided 
compartments (such as a plastic ice cube tray).
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery 
• Keyboard and RAM shield
• AirPort Extreme Card
• Memory card 
						

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 Logic Board • Bottom case
• Bottom shield
• DC-in board
• Fan
• Top case
• Sleep light board (disconnect connector only)
• Top shield
• I/O bezel
• Hard drive
• Modem
• Heatsink
Procedure
Warning: Flexing the logic board can break solder joints to components. To prevent 
damage, do not flex the board.
Warning:  When it is out of the computer case, the frame can be damaged by too much 
pressure. Avoid putting pressure on the frame when removing the logic board.
1. Disconnect the microphone and LVDS cables. 
						

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 Logic Board2. Disconnect the optical drive flex cable.
3. From the underside of the logic board, disconnect the inverter cable. 
						

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 Logic Board 4. Turn over the computer frame and remove the ten Phillips screws that secure the logic 
board to the frame:
• Seven identical 3.5-mm long screws 
• Two 7.5-mm long screws at the battery connector 
• One 5-mm long screw near the fan opening
Replacement Note: When installing the replacement logic board, install the screws 
in the order shown. 
						

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 Logic Board5.Warning: Flexing the logic board can break solder joints to components. To prevent 
damage, do not flex the board.
Lifting the logic board at the ports, tilt up the logic board to remove it from the frame.
Note: When installing the replacement logic board into the frame, make sure that the 
screw openings align completely with all of those in the frame.  
						

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 Logic Board 6. Install the replacement logic board, and reassemble and test the computer.
Note: When reassembling the computer, make sure that you transfer the following 
items from the original logic board to the top of the replacement logic board:
• Memory card
• RJ11 port with modem cable routed over the frame