Apple ibook g4 14 inch mid 2005 User Manual

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 Heatsink 6. Use a black stick to tilt up the heatsink at the opposite corners.
Warning:  The heatsink pipe can bend easily. Use caution when removing or 
replacing the heatsink.
Lift the heatsink out of the computer assembly. 

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 Heatsink
7. Turn over the heatsink and note the placement of the thermal pads.
Important:  Any time the heatsink is removed or a replacement heatsink is to be 
installed, make sure new thermal pads are applied in the following orien\
tation:
• Small rectangular pad at the upper end of the thermal plate
• Largest pad in the middle of the thermal plate
• Square, medium-sized pad at the lower end of the thermal plate
8. Before installing the heatsink, make sure...

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 Heatsink Replacement Note:
  Check for any thermal pad residue remaining on the logic 
board. If any residue remains, carefully remove it with a black stick.
9. 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
• Memory card
• Bottom case 

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 Logic Board • Bottom shield
• DC-in board
• Top case
• Top shield
• I/O Bezel
• RJ11 modem cable (if installing a replacement logic board)
• Modem
• AirPort Extreme/Bluetooth card
• Heatsink
Procedure
Warning:
 Flexing the logic board can break solder joints to components. To prevent 
damage, do not  flex the board.
1. With the computer on a soft cloth, disconnect the following cables: • optical drive cable
• reed switch cable 

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 Logic Board
2. Turn over the frame, and peel up any tape that covers the logic board.
3. Disconnect the sleep light cable and the fan cable. 

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 Logic Board 4. Turn over the frame, and remove the following from the logic board: 
• One 3.5-mm long screw
• Eight 4.5-mm long screws
• Two 6-mm long screws
Replacement Note:  When replacing the logic board, install the screws in the order 
shown. The wide head 3.5-mm long screw is located at position 5. 

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 Logic Board
Note:
 When reassembling the computer, make sure that you transfer the followi\
ng 
items from the original logic board to the top of the replacement logic \
board:
• Memory card
• RJ11 board
5. 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 back ports, tilt up the logic board to re\
move it from the 
frame.
6. Disconnect the logic board from the...

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 Logic Board 7. Install the replacement logic board, and reassemble and test the computer.
Important:  Make sure the replacement logic board includes the following:
• Kapton tape where shown
• Three sponge pads, highlighted below, in the area where the AirPort Extr\
eme/ Bluetooth card is to be installed 

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 Logic Board
Replacement Note:
 Check the underside of the logic board to make sure the 
following cables are connected and secure:
• Sleep light cable
• Fan cable
• Battery transfer board cable