Apple powerbook g4 12 inch User Manual

							PowerBook G4 (12-inch) Take Apart - 49
 DC-to-DC Board5. Place a black stick just under the top edge of the board at the modem standoff. 
Disconnect the DC-to-DC board from the logic board by prying up the DC-to-DC board 
and removing it from the computer assembly.
6. Install the replacement DC-to-DC board, and reassemble and test the computer. 
						

							50 - PowerBook G4 (12-inch) Take Apart
 Heatsink and Fan Assembly: PowerBook G4 (12-
Heatsink and Fan Assembly: 
PowerBook G4 (12-inch)
Tools
This procedure requires the following tools:
• #0 Phillips screwdriver 
• #1 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade 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
• Memory door and memory card  
						

							PowerBook G4 (12-inch) Take Apart - 51
 Heatsink and Fan Assembly: PowerBook G4 (12-• Keyboard
• Top case
• Modem
Procedure
1.Warning: The cone of the subwoofer, located below the heatsink and to the right of 
the fan, is a sensitive device. Avoid touching the subwoofer cone as you perform this 
procedure.
2. Peel up the tape if any of the following screws are covered. Remove the following 
screws from the heatsink:
• Two 6 mm long #0 Phillips screws
• Two 7.5 mm long #1 Phillips screws with springs
• One 13 mm long #0 Phillips screw
• One 4.5 mm long #0 Phillips screw 
						

							52 - PowerBook G4 (12-inch) Take Apart
 Heatsink and Fan Assembly: PowerBook G4 (12- 3. Remove the tape that covers the heatsink and secures the cables in place.
4. Near the fan, peel up the tape and remove the following screws:
• One 3 mm long screw
• One 6 mm long screw
• One 13 mm long screw
5. Peel up the yellow tape, and disconnect the inverter cable that runs along the top of 
the fan from the logic board.
6. Remove the transparent tape at the bottom of the fan, and disconnect the fan cable.
Replacement Note:
 When installing the replacement heatsink assembly, note that 
the fan cable is routed beneath the computer frame.
Replacement Warning:
 Make sure you apply the transparent tape over the bottom of 
the fan so it covers the same area. 
						

							PowerBook G4 (12-inch) Take Apart - 53
 Heatsink and Fan Assembly: PowerBook G4 (12-7. Holding the heatsink at the crossbar, begin to lift up the heatsink assembly, being 
careful where it catches on remaining tape and the chassis. Use a black stick to pry up 
the middle right corner of the heatsink plate.
Warning:
 To avoid bending the heatsink, support the heatsink as it is removed. 
8. Route the fan cable through the slot in the computer frame. 
						

							54 - PowerBook G4 (12-inch) Take Apart
 Heatsink and Fan Assembly: PowerBook G4 (12- 9. Note the routing of the remaining cables and the placement of tape once the heatsink 
is removed.
.
10. Install the replacement heatsink and fan assembly, and reassemble and test the 
computer.
Replacement Note:
 When reapplying tape around the fan, make sure the fan 
blades are not blocked. The image below shows the correct application of tape. 
						

							PowerBook G4 (12-inch) Take Apart - 55
 Heatsink: PowerBook G4 (12-inch DVI)
Heatsink: PowerBook G4 
(12-inch DVI)
Tools
This procedure requires the following tools:
• #0 Phillips screwdriver 
• #1 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade 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
• Memory door and memory card 
• Keyboard
• Top case
• Modem 
						

							56 - PowerBook G4 (12-inch) Take Apart
 Heatsink: PowerBook G4 (12-inch DVI)
Procedure
1.Warning: The cone of the subwoofer, located below the heatsink and to the right of 
the fan, is a sensitive device. Avoid touching the subwoofer cone as you perform this 
procedure.
2. Peel up the tape if any of the following screws are covered. Remove the following 
screws from the heatsink:
• Three 6 mm long #0 Phillips screws
• Two 7.5 mm long #1 Phillips screws with springs
• Two 13 mm long #0 Phillips screws
• One 4.5 mm long #0 Phillips screw 
						

							PowerBook G4 (12-inch) Take Apart - 57
 Heatsink: PowerBook G4 (12-inch DVI)3. Near the fan, peel up the tape that secures the cables to the heatsink.
4. Remove the 3mm-long screw that secures the inverter cable to the frame. 
5. Disconnect the inverter cable that runs along the top of the fan from the logic board.
6. Use a black stick to pry up the lower right side of the heatsink plate. Holding the 
heatsink at the crossbar, begin to lift up the heatsink assembly, being careful where it 
catches on remaining tape and the chassis. 
Warning:
 To avoid bending the heatsink, support the heatsink as it is removed.  
						

							58 - PowerBook G4 (12-inch) Take Apart
 Heatsink: PowerBook G4 (12-inch DVI) 7. Check the thermal pads on the heatsink:
• If you are performing another module replacement and will be using the existing 
heatsink, peel away the thermal pads on the underside of the heatsink, and apply 
new thermal pads in the orientation shown.
• If you are installing a replacement heatsink, make sure that the thermal pads are 
correctly installed as shown.
Note:
 If any thermal pad residue remains on the logic board, use a black stick to 
carefully peel it away.
8. When installing the heatsink, first insert the lower flange of the heatsink panel under 
the frame.