Apple ibook g4 12 inch mid 2005 User Manual

iBook G4 (12-inch Mid 2005) Take Apart - 110
 Vent Cover
Procedure
1. With the computer assembly on a soft cloth, remove the two 3.5-mm long vent cover 
screws.
2. Remove the vent cover from the computer assembly.
3. Install the replacement vent cover, and reassemble and test the computer. 

111 - iBook G4 (12-inch Mid 2005) Take Apart
 Heatsink
Heatsink
Tools
• Soft cloth
• #0 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic tool)
• #4 hex nut driver or needlenose pliers   
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery 
• Keyboard and RAM shield
• Memory card
• Bottom case 
• Bottom shield 

iBook G4 (12-inch Mid 2005) Take Apart - 112
 Heatsink • DC-in board
• Top case
• Top shield
• Modem
• AirPort Extreme/Bluetooth card
Procedure
1. With the computer assembly on a soft cloth, remove the two 3.5-mm screws at the 
vent cover.
2. Remove the following from the heatsink: • Two 7-mm long hex nuts with captive springs
• One 8-mm long Phillips screw
• Five 6-mm long Phillips screws
Important:  When installing the two hex nuts with captive springs, install the left\
 one 
half way, then install...

113 - iBook G4 (12-inch Mid 2005) Take Apart
 Heatsink
3.
Caution:   Carefully tilt up the vent cover only as far as it will go. Forcing the vent cover 
could crack it. 

iBook G4 (12-inch Mid 2005) Take Apart - 114
 Heatsink 4. Before removing the heatsink, carefully pull up the AirPort Extreme/Bluetooth antenna 
cables from the corner of the thermal plate near the memory slot. 
Caution:   Skipping this step could damage the antenna cables.
5. Begin to lift up the heatsink, being careful where the copper pipe  fits between the 
standoff and the vent cover. 

115 - iBook G4 (12-inch Mid 2005) Take Apart
 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.
7. Note how the thermal pads on the heatsink compare to the size of the three main  chips on the board. 

iBook G4 (12-inch Mid 2005) Take Apart - 116
 Heatsink 8. 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
9. Before installing the heatsink, make sure...

117 - iBook G4 (12-inch Mid 2005) Take Apart
 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.
10. Install the replacement heatsink and new thermal pads, and reassemble and test the  computer. 

iBook G4 (12-inch Mid 2005) Take Apart - 118
 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 

119 - iBook G4 (12-inch Mid 2005) Take Apart
 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