12-inch - AppleRepairManuals.com

 Service Source
PowerBook G4 (12-inch)
January 20, 2003
© 2003 Apple Computer, Inc. All rights reserved.
 Service Source
Take Apart
PowerBook G4 (12-inch)
© 2003 Apple Computer, Inc. All rights reserved.
General Information
Overview
Some of the key features that distinguish this computer from earlier notebook models
include:
• 12-inch active-matrix display in aluminum alloy enclosure
• built-in Bluetooth
• slot load optical drive
• optional AirPort Extreme Card and Base Station
New Procedures
If you are familiar with taking apart notebook computers, you will notice some differences
with this model:
• Memory card is easily accessible from the bottom of the computer.
• Optional AirPort Extreme Card is accessed from the battery bay.
• The number and types of screws differ from earlier models.
• Additional parts that are offered for replacement include Bluetooth and the subwoofer.
General Information
PowerBook G4 (12-inch) Take Apart - 1
Tools
Most of the tools required for taking apart this computer are the same as for earlier
notebook models; however, there are two new tools:
• 1.5 mm hex driver (small hex head screwdriver) used for the top case and the display
housing
• 4 mm socket wrench or needlenose pliers used for the DC-to-DC board
The following tools are recommended for this computer:
• Coin
• ESD wriststrap and mat
• Small soft cloth
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
• #0 Phillips screwdriver (magnetized)
• #1 Phillips screwdriver (magnetized)
• Jeweler’s flat-blade screwdriver
• 1.5 mm hex driver
• 4 mm socket wrench or needlenose pliers
Important: To organize the screws you remove from the computer, use a tray with divided
compartments (such as a plastic ice cube tray). If doing a complete disassembly, note the
screws removed from each location in the computer.
Serial Number Location
The serial number is located in the battery bay.
2 - PowerBook G4 (12-inch) Take Apart
General Information
Battery
Tools
This procedure requires the following tools:
• Soft cloth
• Coin
Part Location
Preliminary Steps
Warning: Always shut down the computer before opening it to avoid damaging its
internal components or causing injury. After you shut down the computer, the
internal components can be very hot. Let the computer cool down before
continuing.
Battery
PowerBook G4 (12-inch) Take Apart - 3
Procedure
Warning: If the computer has been recently operating, allow it to cool down before
performing this procedure.
1. Shut down the computer.
2. Unplug the power adapter and phone cord.
3. Turn over the computer and place it on a soft cloth.
4. Use a coin to release the battery lock.
5. Lift the battery out of the battery bay.
6. Install the replacement battery, and reassemble and test the computer.
4 - PowerBook G4 (12-inch) Take Apart
Battery
Memory Door and Memory Card
Tools
This procedure requires the following tools:
• Soft cloth
• #0 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
Part Location
Preliminary Steps
Before you begin, remove the battery.
Procedure
Warning: If the computer has been recently operating, allow it to cool down before
performing this procedure.
Memory Door and Memory Card
PowerBook G4 (12-inch) Take Apart - 5
1. Place the computer upside down on a soft cloth.
2. Remove the four identical screws from the memory door.
3.
Use a black stick to lift off the memory door.
4. If a memory card is already installed, release it by spreading apart the tabs in the
expansion slot from the notches in the card. Allow the card to pop up slightly, and pull
it out of the memory slot.
6 - PowerBook G4 (12-inch) Take Apart
Memory Door and Memory Card
5. Insert the replacement memory card into the expansion slot at a 30-degree angle.
6. Make sure the memory card is fully inserted. Check that the notches in the card clear
the tabs as you press down on the sides of the card to lock it into place.
7. Install the memory door back onto the bottom case, and reassemble and test the
computer.
Memory Door and Memory Card
PowerBook G4 (12-inch) Take Apart - 7
AirPort Extreme Card
Tools
This procedure requires the following tools:
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
Part Location
Preliminary Steps
Before you begin, remove the battery.
8 - PowerBook G4 (12-inch) Take Apart
AirPort Extreme Card
Procedure
Warning: If the computer has been recently operating, allow it to cool down before
performing this procedure.
1. Touch a metal surface inside the battery bay to discharge static electricity built up on
your body.
2. Open the door to the AirPort slot.
3. If an optional AirPort Extreme Card is already installed, use a black stick to un-loop the
pull tab.
AirPort Extreme Card
PowerBook G4 (12-inch) Take Apart - 9
4. Gently disconnect the AirPort antenna cable.
5. Use the pull tab to pull out the card.
10 - PowerBook G4 (12-inch) Take Apart
AirPort Extreme Card
6. Slide the replacement AirPort Extreme Card into the slot, as shown.
7. Connect the end of the antenna cable to the card.
8. Loop the clear plastic tab over and under the card so that the tab secures the antenna
cable and tucks into the slot. Close the AirPort door.
9. Reassemble and test the computer.
AirPort Extreme Card
PowerBook G4 (12-inch) Take Apart - 11
Keyboard
Tools
This procedure requires the following tools:
• #0 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
12 - PowerBook G4 (12-inch) Take Apart
Keyboard
Procedure
1. With the computer upside down on a soft cloth, remove the single screw from the
memory card bay.
Keyboard
PowerBook G4 (12-inch) Take Apart - 13
2. Open the computer, and locate the following keys:
• F1
• F2
• F11
• F12
3. Important: Using a black stick, carefully pry up each of the four keys from the left side
of each key. The keys are easily removed from the left side without damaging the
keyboard.
14 - PowerBook G4 (12-inch) Take Apart
Keyboard
4. Use a black stick or flat-blade screwdriver to lift off the two round stickers that are
located between the two key mechanisms. Reserve the stickers for replacement.
5. Remove the screw under each of the stickers.
Keyboard
PowerBook G4 (12-inch) Take Apart - 15
6. Lift up the top two corners of the keyboard, and move the keyboard toward the display
to clear the tabs at the bottom of the keyboard.
16 - PowerBook G4 (12-inch) Take Apart
Keyboard
7. Flip the keyboard over and lay the keyboard flat on the trackpad.
8. Use a black stick to carefully remove the aluminum tape that covers the keyboard
connector. You will need to reuse the tape when reassembling the computer.
9. Peel up the keyboard cable from its adhesive. Using a black stick, pry up the tabs at
the ends of the connector, and then pull the cable straight up to disconnect it.
Keyboard
PowerBook G4 (12-inch) Take Apart - 17
10. Install the replacement keyboard. Make sure you
• Install the foil tape in the recessed area over the keyboard connector.
• Set the tabs at the bottom of the keyboard into the slots in the top case.
• Press the keyboard into place, and install the screws and round stickers.
• Install the function keys:
– Position the key directly over the scissor mechanism.
– Press the key onto the scissor.
– Check the operation of the key.
• Close the display and install the final screw in the memory bay.
11. Reassemble and test the computer.
18 - PowerBook G4 (12-inch) Take Apart
Keyboard
Top Case
Tools
This procedure requires the following tools:
• #0 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
• Hex 1.5 mm screwdriver
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
PowerBook G4 (12-inch) Take Apart - 19
Procedure
1. Warning: The screws in the battery bay require holding the screwdriver at an
angle. Be careful not to strip the screws.
Note: Avoid scratching the external housing by using care when removing the
screws. You might want to cover part of the housing with a soft cloth as you
remove screws.
With the computer upside down on a soft cloth, remove the three screws from
the bottom case at the battery bay.
2. Remove the screws near the display hinge.
20 - PowerBook G4 (12-inch) Take Apart
Top Case
3. Open the display, and with the computer upright, remove the following 13 screws from
the top case:
• one Hex, 16.5 mm long screw at upper right corner near power button
• one Hex, 7 mm long screw at upper left corner near microphone
• one #0 Phillips, 15 mm long screw in keyboard well
• four #0 Phillips, 4.5 mm long screws in keyboard well
• six #0 Phillips, 2.5 mm long screws in keyboard well
4. Remove two screws from the front right side of the top case.
5. Remove two screws from the front left side of the top case.
Top Case
PowerBook G4 (12-inch) Take Apart - 21
6. Carefully remove the foil tape from the keyboard well that covers the microphone cable
and power cable. You will need to reuse the tape when reassembling the computer.
7. Use a black stick in the small openings to disconnect the two cables.
22 - PowerBook G4 (12-inch) Take Apart
Top Case
8. Remove the screw near the cables.
9. Carefully remove the foil tape over the trackpad cable. You will need to reuse the tape
when reassembling the computer.
Top Case
PowerBook G4 (12-inch) Take Apart - 23
10. Use the pull tab to release the trackpad cable.
11. Use a black stick running along the edge of the top case to lift up the top case from the
bottom case. Use equal pressure at the front, left, and right corners.
24 - PowerBook G4 (12-inch) Take Apart
Top Case
12. The top case includes the following:
• Microphone cable
• Trackpad and trackpad cable
• Power button and cable
• Tape
• Welded EMI strips
Top Case
PowerBook G4 (12-inch) Take Apart - 25
13. Before installing a replacement top case, check the cable routing of the
• Microphone cable
• Trackpad cable
• Power button cable
Make sure the cables are routed correctly and cannot be pinched when
installing the top case.
14. Install the replacement top case, and reassemble and test the computer.
26 - PowerBook G4 (12-inch) Take Apart
Top Case
Reed Switch Board and Cable
Tools
This procedure requires the following tools:
• Phillips #0 screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• Keyboard
• Top case
Reed Switch Board and Cable
PowerBook G4 (12-inch) Take Apart - 27
Procedure
1. Remove the screw from the reed switch board.
Warning: When replacing the board, make sure you use the same screw. A
longer screw could scratch the optical media.
2. Tilt the board up and away from the tab at the battery area.
3. Lift up the tape from the corner of the optical drive, and disconnect the 3-pin connector
from CN4 at the DC-to-DC board.
4. Install the replacement reed switch board and cable, and reassemble and test the
computer.
28 - PowerBook G4 (12-inch) Take Apart
Reed Switch Board and Cable
Hard Drive
Tools
This procedure requires the following tools:
• #0 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
Hard Drive
PowerBook G4 (12-inch) Take Apart - 29
• Keyboard
• Top case
Procedure
1. Disconnect the hard drive flex cable.
2. Remove two screws from the hard drive bracket.
30 - PowerBook G4 (12-inch) Take Apart
Hard Drive
3. Use the flex cable to lift up the hard drive, bracket, and cable from the computer
housing.
4. Turn over the hard drive and remove the two screws from the underside of the bracket.
Hard Drive
PowerBook G4 (12-inch) Take Apart - 31
5. Peel up the flex cable from its double-sided tape.
6. Use a black stick to pry the flex cable connector up slightly on each side, and then pull
it straight off the drive. Be careful not to bend any pins.
7. Remove the two screws and grommets from the opposite side of the drive.
8. Replacement Note: When installing the replacement drive, make sure the center
flange of the hard drive bracket fits over the small post on the computer frame.
9. Install the replacement hard drive, and reassemble and test the computer.
32 - PowerBook G4 (12-inch) Take Apart
Hard Drive
DC-to-DC Board
Tools
This procedure requires the following tools:
• #0 Phillips screwdriver (magnetized preferred)
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
• 4 mm socket wrench or needlenose pliers
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
DC-to-DC Board
PowerBook G4 (12-inch) Take Apart - 33
•
•
•
•
Memory door and memory card
Keyboard
Top case
Hard drive
Procedure
1. Remove the three screws from the DC-to-DC board.
Note: When removing the 3 mm-long screw, the magnetic latch might draw the
screw toward it.
2. Remove the two screws at the battery connector.
34 - PowerBook G4 (12-inch) Take Apart
DC-to-DC Board
3. Lift off the EMI strip from the battery connector. Be sure to replace it when installing
the replacement DC-to-DC board.
4. Use a black stick to tilt up the board from the logic board, and lift the opposite end of
the board to remove it from the computer housing.
Warning: To avoid bending pins, lift the board evenly at both ends.
5. Install the replacement DC-to-DC board, and reassemble and test the computer.
DC-to-DC Board
PowerBook G4 (12-inch) Take Apart - 35
Modem
Tools
This procedure requires the following tools:
• #0 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• Keyboard
• Top case
36 - PowerBook G4 (12-inch) Take Apart
Modem
Procedure
1. Remove the two screws from the modem board.
2. Use a black stick to tilt up the modem and disconnect it from the logic board.
Modem
PowerBook G4 (12-inch) Take Apart - 37
3. At the other end of the modem, disconnect the modem cable from the connector.
Replacement Note: When placing the replacement modem on the logic board, be sure to
align the board over the standoffs and connector on the logic board.
4. Install the replacement modem, and reassemble and test the computer.
38 - PowerBook G4 (12-inch) Take Apart
Modem
Heatsink and Fan Assembly
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
Heatsink and Fan Assembly
PowerBook G4 (12-inch) Take Apart - 39
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
40 - PowerBook G4 (12-inch) Take Apart
Heatsink and Fan Assembly
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.
Heatsink and Fan Assembly
PowerBook G4 (12-inch) Take Apart - 41
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.
42 - PowerBook G4 (12-inch) Take Apart
Heatsink and Fan Assembly
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.
Heatsink and Fan Assembly
PowerBook G4 (12-inch) Take Apart - 43
Inner Frame
Tools
This procedure requires the following tools:
• #0 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
44 - PowerBook G4 (12-inch) Take Apart
Inner Frame
•
•
•
•
•
Reed switch
Hard drive
DC-to-DC board
Modem
Heatsink with fan
Procedure
1. Note the cable routing and placement of tape before disconnecting cables.
Replacement Note: Reserve the tape for securing cables after the frame
replacement.
Inner Frame
PowerBook G4 (12-inch) Take Apart - 45
2. Warning: The subwoofer cone, located below the right corner of the frame, is a
sensitive device. Avoid touching the cone as you perform this procedure.
3. Disconnect the connector from the upper right corner of the logic board.
4. Remove the screw near the right corner of the frame.
5. Near the I/O ports, disconnect the
• long black cable from the 2-pin connector
• shorter black cable from the 4-pin connector
46 - PowerBook G4 (12-inch) Take Apart
Inner Frame
6. Pull up the LVDS cable with the pull tab
Warning: Be careful not to strain the LVDS cable.
7. Remove the screw at the LVDS cable.
Replacement Note: When reinstalling the LVDS cable, tuck the pull tab under
the frame.
Inner Frame
PowerBook G4 (12-inch) Take Apart - 47
8. Peel up the tape, and remove the screw at the RJ11 modem cable board.
9. Tilt up the RJ11 modem cable board and remove the 6-mm long screw (not shown)
that secures the frame to the logic board.
48 - PowerBook G4 (12-inch) Take Apart
Inner Frame
10. Remove the two screws at the I/O ports.
11. Remove the EMI strip at the top of the I/O ports.
Inner Frame
PowerBook G4 (12-inch) Take Apart - 49
12. Remove the three screws from the top of the heatsink.
13. Remove the two screws from the lower left corner of the computer assembly.
50 - PowerBook G4 (12-inch) Take Apart
Inner Frame
14. Disconnect the optical drive flex cable.
15. Lift up the frame, being careful where it catches on the optical drive flex cable or other
cables.
Inner Frame
PowerBook G4 (12-inch) Take Apart - 51
16. Lift the inner frame out of the computer assembly.
52 - PowerBook G4 (12-inch) Take Apart
Inner Frame
17. Install the replacement frame, and reassemble and test the computer.
Replacement Note: When installing the replacement frame, note the initial routing
of the cables, as shown in the following images:
Inner Frame
PowerBook G4 (12-inch) Take Apart - 53
RJ11 Modem Board and Cable
Tools
This procedure requires the following tools:
• #0 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
54 - PowerBook G4 (12-inch) Take Apart
RJ11 Modem Board and Cable
Procedure
1. Disconnect the modem cable connector from the modem (Refer to the Modem
procedure in this chapter. You do not have to remove the modem board to disconnect
the cable.)
2. Remove the screw at the LVDS cable.
Replacement Note: When reinstalling the LVDS cable, tuck the pull tab under
the frame.
3. Peel up the tape that secures the LVDS cable.
RJ11 Modem Board and Cable
PowerBook G4 (12-inch) Take Apart - 55
4. Remove the screw at the RJ11 board.
5. Use a black stick to tilt up the RJ11 board and lift it out of the inner frame.
56 - PowerBook G4 (12-inch) Take Apart
RJ11 Modem Board and Cable
6. Remove the EMI shield from the RJ11 board. The board includes the attached cable
and connector.
7. Install the replacement RJ11 modem board and cable, and reassemble and test the
computer.
RJ11 Modem Board and Cable
PowerBook G4 (12-inch) Take Apart - 57
Sleep Light
Tools
This procedure requires the following tools:
• #0 Phillips screwdriver
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• Keyboard
• Top case
• Reed switch
• Hard drive
• DC-to-DC board
• Modem
• Heatsink with fan
58 - PowerBook G4 (12-inch) Take Apart
Sleep Light
• RJ11 board
• Inner frame
Procedure
1. Remove the screw from the sleep light board.
2. Remove the board from the bottom case.
3. Replacement Note: Make sure the bottom case has the sleep light pipe installed
before installing the replacement sleep light board.
4. Install the replacement sleep light board, and reassemble and test the computer.
Sleep Light
PowerBook G4 (12-inch) Take Apart - 59
Logic Board
Tools
This procedure requires the following tools:
• #0 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
• AirPort Extreme Card, if installed
• Keyboard
• Top case
60 - PowerBook G4 (12-inch) Take Apart
Logic Board
•
•
•
•
•
•
•
Reed switch
Hard drive
DC-to-DC board
Modem
Heatsink with fan
RJ11 board
Inner frame
Procedure
1. Remove the two screws near the right edge of the board.
Logic Board
PowerBook G4 (12-inch) Take Apart - 61
2. Holding the edges of the board tilt up the logic board.
3. While holding the board vertically, disconnect the DC-in connector cable from the
underside of the logic board.
62 - PowerBook G4 (12-inch) Take Apart
Logic Board
4. Remove the side EMI shield from the I/O ports.
Warning: When installing the EMI shield over the logic board ports, make
sure that the shield fits loosely and the ports are not obstructed.
5. Install the replacement logic board, and reassemble and test the computer.
Replacement Note: Before securing the replacement logic board in the bottom
case, make sure the white plastic wireless guide is fitted against the AirPort
Extreme Card carrier in the bottom case. (The wireless guide requires no
screws to hold it in place.)
Logic Board
PowerBook G4 (12-inch) Take Apart - 63
DC-In Board
This procedure requires the following tools:
• #0 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• AirPort Extreme Card, if installed
• Keyboard
• Top case
• Reed switch
• Hard drive
• DC-to-DC board
• Modem
64 - PowerBook G4 (12-inch) Take Apart
DC-In Board
•
•
•
•
Heatsink with fan
RJ11 board
Inner frame
Logic board
Procedure
1. Hold the DC-in board in place as you remove the screw that attaches the board to the
bottom case.
2. Pull the flat cable up from the adhesive on the bottom case.
3. Pull the board away from the side of the bottom housing. Use a black stick to lift up the
board, if necessary.
DC-In Board
PowerBook G4 (12-inch) Take Apart - 65
4. Remove the round port liner.
5. Install the replacement DC-in board, and reassemble and test the computer.
66 - PowerBook G4 (12-inch) Take Apart
DC-In Board
Optical Drive
Tools
This procedure requires the following tools:
• #0 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
• AirPort Extreme Card, if installed
• Keyboard
Optical Drive
PowerBook G4 (12-inch) Take Apart - 67
•
•
•
•
•
•
•
•
•
Top case
Reed switch
Hard drive
DC-to-DC board
Modem
Heatsink with fan
RJ11 board
Inner frame
Logic board
Procedure
1. Remove the two screws from the shoulder bracket at the upper right corner of the
optical drive.
68 - PowerBook G4 (12-inch) Take Apart
Optical Drive
2. Use a black stick to remove the shoulder bracket.
3. Remove the two screws from the slot load bezel.
Replacement Note: When installing the replacement optical drive in the bottom
case, make sure the slot load bezel is flush against the slot in the side of the bottom
case before installing the screws.
Optical Drive
PowerBook G4 (12-inch) Take Apart - 69
4. Tilt up the optical drive and remove it from the computer.
5. Remove the screws from the L-shaped EMI bracket on the top of the drive. Lift off the
bracket.
70 - PowerBook G4 (12-inch) Take Apart
Optical Drive
6. Turn over the drive and remove the three screws from the L-shaped EMI bracket on
the bottom of the drive.
7. Remove the bottom L-shaped EMI bracket.
Optical Drive
PowerBook G4 (12-inch) Take Apart - 71
8. Use a black stick to press the tabs and remove the slot load bezel. Pull the bezel
straight off the drive.
9. Disconnect the flex cable.
10. Install the replacement optical drive, and reassemble and test the computer.
72 - PowerBook G4 (12-inch) Take Apart
Optical Drive
Bluetooth
Tools
This procedure requires the following tools:
• #0 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• AirPort Extreme Card, if installed
• Keyboard
• Top case
• Reed switch
• Hard drive
Bluetooth
PowerBook G4 (12-inch) Take Apart - 73
•
•
•
•
•
•
•
DC-to-DC board
Modem
Heatsink with fan
RJ11 board
Inner frame
Logic Board
Optical drive
Procedure
Warning: The subwoofer, located to the left of the Bluetooth board, is a sensitive device.
Avoid touching the subwoofer as you perform this procedure.
Warning: To avoid excessive pressure on the Bluetooth board, hold the edge of the board
in place as you perform this procedure.
1. If tape covers part of the board, hold the board in place as you remove the tape.
2. Use a black stick to disconnect the 4-pin connector from the board.
3. Holding the Bluetooth cable connector, pull it straight up to disconnect it.
4. Remove the screw from the Bluetooth board.
5. Remove the Bluetooth board from the bottom case.
6. Install the replacement Bluetooth, and reassemble and test the computer.
74 - PowerBook G4 (12-inch) Take Apart
Bluetooth
Subwoofer
Tools
This procedure requires the following tools:
• #0 Phillips screwdriver
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
Part Location
Note: In the image above, the Bluetooth cable appearance differs from the production
models of this computer.
Procedure
Note: Refer to the "Display Module" procedure. You can remove the subwoofer while it is
still in the bottom case (and before removing the display) by removing the tape and the
single screw from the subwoofer.
Subwoofer
PowerBook G4 (12-inch) Take Apart - 75
Display Module
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
• AirPort Extreme Card, if installed
• Keyboard
76 - PowerBook G4 (12-inch) Take Apart
Display Module
•
•
•
•
•
•
•
•
•
•
•
•
Top case
Reed switch
Hard drive
DC-to-DC board
Modem
Heatsink with fan
RJ11 board
Inner frame
Logic Board
Optical drive
Bluetooth
DC-in board
Procedure
Important: This procedure show s the subwoofer and inner rear panel attached to the
display module when it is removed from the bottom case. However, you can remove the
subwoofer from the bottom case you do not need to remove the subwoofer and display
module together.
1. With the computer upside down, remove the two screws from the bottom case.
Display Module
PowerBook G4 (12-inch) Take Apart - 77
2. Remove the screws near the display hinge.
3. From the inside of the bottom case, remove the tape from the antenna cable.
78 - PowerBook G4 (12-inch) Take Apart
Display Module
4. Route the AirPort antenna cable through the AirPort Extreme Card bay.
5. Remove the screw from the subwoofer.
Note: In the image above, the Bluetooth cable appearance differs from the
production models of this computer.
Display Module
PowerBook G4 (12-inch) Take Apart - 79
6. Peel the tape off of the subwoofer.
Warning: The cone of the subwoofer is a sensitive device. Avoid touching the
subwoofer cone as you perform this procedure.
Note: In the image above, the Bluetooth cable appearance differs from the
production models of this computer.
7. Note: The back edge of the subwoofer adheres to the rear panel.
Use a black stick to pry open the adhesive seal at the rear panel. Pivot the
subwoofer away from the rear panel, and remove the subwoofer from the
bottom case.
80 - PowerBook G4 (12-inch) Take Apart
Display Module
8. With the display open to a 90-degree angle, lift off the display with attached subwoofer
and inner rear frame.
Important: The display might get caught on the hooks (shown below) on the
bottom case. If so, carefully reposition the display so it is laying face up with
the attached bottom case standing vertically. Gently twist the bottom case to
release it from the display.
Display Module
PowerBook G4 (12-inch) Take Apart - 81
9. Remove the four screws from the display’s inner rear panel. Make sure the
screwdriver does not touch the speakers.
10. Remove the inner rear panel with attached speakers by routing the cables through the
slots in the rear panel.
Replacement Note: When installing the rear panel, hold the routed cables
away from the path of the screws.
82 - PowerBook G4 (12-inch) Take Apart
Display Module
Replacement Note: When installing the rear panel, check that the twisted
pair of speaker cables is completely recessed in the panel and that the tape
holds the cables in place.
Replacement Note: Check that the orientation of the cables directed through
the rear panel openings are as shown below:
Display Module
PowerBook G4 (12-inch) Take Apart - 83
11. Install the replacement display module, and reassemble and test the computer.
84 - PowerBook G4 (12-inch) Take Apart
Display Module
Bottom Case
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• AirPort Extreme Card, if installed
• Keyboard
• Top case
• Reed switch
• Hard drive
• DC-to-DC board
• Modem
• Heatsink with fan
• RJ11 board
• Inner frame
• Sleep light board
• Logic board
Bottom Case
PowerBook G4 (12-inch) Take Apart - 85
•
•
•
•
•
DC-in board
Optical drive
Bluetooth
Subwoofer
Display module
Procedure
When all preliminary steps are performed, the bottom case is the part that remains.
86 - PowerBook G4 (12-inch) Take Apart
Bottom Case
Display Housing
Tools
This procedure requires the following tools:
• 1.5 mm hex driver
• Black stick (or other nonconductive nylon or plastic flat-blade tool)
• Optional: Credit card (or other thin plastic card)
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• AirPort Extreme Card, if installed
• Keyboard
• Top case
• Reed switch
Display Housing
PowerBook G4 (12-inch) Take Apart - 87
•
•
•
•
•
•
•
•
•
•
Hard drive
DC-to-DC board
Modem
Heatsink with fan
RJ11 board
Inner frame
Logic board
DC-in board
Optical drive
Display module
Procedure
1. Remove the two 5-mm long hex screws from the front bezel.
88 - PowerBook G4 (12-inch) Take Apart
Display Housing
2. Use a black stick or thin plastic credit card around the outer edge of the bezel to
separate the display housing tabs from the display assembly.
Warning: To avoid damage to the antenna receptors or inner cables, do not
poke the black stick or credit card inside the display. Keep the tool at a nearly
horizontal plane with the display bezel as you loosen the display assembly
from the display housing.
Note: In the image above, the Bluetooth cable appearance differs from the
production models of this computer.
Display Housing
PowerBook G4 (12-inch) Take Apart - 89
3. Lift the display assembly off of the display housing.
4. Note the routing of the antenna cables. Peel up the tape that holds the cables in place.
Warning: Handle the antenna receptors and cables with care. Do not strain or
pinch the cables. Do not apply pressure to or bend the antenna receptors.
5. Disconnect the antenna cables and receptors on each side of the display housing.
Warning: The hooks that hold the antenna cables in place are delicate. Use care
when disconnecting the cables.
90 - PowerBook G4 (12-inch) Take Apart
Display Housing
6. Remove the display housing.
7. Install the replacement display housing, and reassemble and test the computer.
Display Housing
PowerBook G4 (12-inch) Take Apart - 91
LCD Panel
Tools
This procedure requires the following tools:
• Phillips #0 screwdriver
• Black stick or other nonconductive plastic or nylon tool
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• AirPort Extreme Card, if installed
• Keyboard
• Top case
• Reed switch
• Hard drive
92 - PowerBook G4 (12-inch) Take Apart
LCD Panel
•
•
•
•
•
•
•
•
•
•
DC-to-DC board
Modem
Heatsink with fan
RJ11 board
Inner frame
Logic board
DC-in board
Optical drive
Display module
Display housing
Procedure
Note: Reuse the tape you remove from the LCD panel.
1. Hold the backing for the LCD panel in place as you peel off the tape and disconnect
the LCD cable.
LCD Panel
PowerBook G4 (12-inch) Take Apart - 93
2. Remove the two screws from each side of the LCD panel.
94 - PowerBook G4 (12-inch) Take Apart
LCD Panel
3. Lift off the long EMI clip at the base of the bezel.
4. Raise up the LCD panel and disconnect the connector to the inverter board.
5. Install the replacement LCD panel, and reassemble and test the computer.
Replacement Note: When installing the replacement LCD panel in the display
bezel assembly, make sure the cable is connected to the inverter board and
routed as shown.
LCD Panel
PowerBook G4 (12-inch) Take Apart - 95
Inverter Board (and Antenna
Cable Assembly)
Tools
This procedure requires the following tools:
• Phillips #0 screwdriver
• Black stick or other nonconductive plastic or nylon 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
• AirPort Extreme Card, if installed
• Keyboard
• Top case
• Reed switch
96 - PowerBook G4 (12-inch) Take Apart
Inverter Board (and Antenna Cable Assembly)
•
•
•
•
•
•
•
•
•
•
•
•
Hard drive
DC-to-DC board
Modem
Heatsink with fan
RJ11 board
Inner frame
Logic board
DC-in board
Optical drive
Display module
Display housing
LCD panel
Procedure
1. Remove the single screw near the center of the inverter board.
Inverter Board (and Antenna Cable Assembly)
PowerBook G4 (12-inch) Take Apart - 97
2. Lift up the board.
3. Peel away the tape and mylar cover that holds the inverter board and the antenna
cable assembly together.
98 - PowerBook G4 (12-inch) Take Apart
Inverter Board (and Antenna Cable Assembly)
4. Separate the antenna cable assembly (board with attached antenna cables and
Bluetooth cable) from the inverter board.
5. Remove the screws from the clutch cover.
6. Remove the five screws from the bottom edge of the display bezel
Inverter Board (and Antenna Cable Assembly)
PowerBook G4 (12-inch) Take Apart - 99
7. Separate the clutch cover from the bezel and remove the LVDS cable.
8. Remove the antenna cables and inverter from the clutch cover.
100 - PowerBook G4 (12-inch) Take Apart
Inverter Board (and Antenna Cable Assembly)
Replacement Note: When reinstalling the clutch cover, check that the cables
are routed as shown below (Bluetooth cable on the bottom of the clutch):
Inverter Board (and Antenna Cable Assembly)
PowerBook G4 (12-inch) Take Apart - 101
9. From the left side of the bezel, remove the three screws.
10. Important: In the following steps, note that because of the position of the bezel, the
designation of right and left differs. For example, the right hinge with bezel brace is
removed from the left side of the bezel because you are viewing the bezel from its
inner side. Likewise, the left hinge with bezel brace is removed from the right side of
the bezel.
Remove the right hinge with bezel brace from the left side of the bezel.
102 - PowerBook G4 (12-inch) Take Apart
Inverter Board (and Antenna Cable Assembly)
11. From the right side of the bezel, slide out the left hinge with bezel brace (no screws on
this side).
Replacement Note: To distinguish the right hinge with bezel brace from the
left hinge with bezel brace, note that the right hinge has three flanges on the
outer edge for the three screws.
Inverter Board (and Antenna Cable Assembly)
PowerBook G4 (12-inch) Take Apart - 103
Display Bezel
Part Location
Preliminary Steps
Before you begin, remove the following:
• Battery
• Memory door and memory card
• AirPort Extreme Card, if installed
• Keyboard
• Top case
• Reed switch
• Hard drive
• DC-to-DC board
• Modem
• Heatsink with fan
• RJ11 board
• Inner frame
• Logic board
• DC-in board
104 - PowerBook G4 (12-inch) Take Apart
Display Bezel
•
•
•
•
•
Optical drive
Display module
Display housing
LCD panel
Inverter (and antenna cable assembly)
Procedure
When all preliminary steps are performed, the display bezel is the part that remains.
Display Bezel
PowerBook G4 (12-inch) Take Apart - 105
 Service Source
Troubleshooting
PowerBook G4 (12-inch)
© 2003 Apple Computer, Inc. All rights reserved.
Symptom Charts
How to Use the Symptom Charts
The Symptom Charts included in this chapter will help you diagnose specific symptoms
related to the product.
The steps to solve a symptom are listed sequentially. You might not need to perform every
step before the symptom is solved. Start with the first step, and then test for the symptom.
If the symptom persists, replace any modules you removed, go to the next step, and test
again. Continue down the list until the symptom is solved.
Important: This computer starts up only in Mac OS X. Mac OS 9 is not available as a
startup disk and previous versions of the Mac OS should not be installed on this computer.
AirPort Extreme Card
AirPort Extreme Card not recognized
1. Use Software Update in Mac OS X system preferences or see the Apple Software
Updates web page to make sure the latest version of AirPort software is installed.
2. Reseat AirPort Extreme Card and make sure AirPort antenna cable is fully connected.
3. Verify settings in Network Preferences pane.
4. Check that AirPort Extreme Card appears in Apple System Profiler under Network
overview in System Profile.
5. Replace with known-good AirPort Card.
6. Replace logic board.
Battery
The battery won't charge
1. Make sure that power adapter connector is fully inserted.
2. Remove any connected peripherals.
3. Try known-good power outlet. Green or amber light should glow at power adapter
connector.
Symptom Charts
PowerBook G4 (12-inch) Troubleshooting - 1
4. Try known-good power adapter and power cord.
Note: Verify that power adapter connector glows amber or green. If the power
adapter light is green, turn over the computer and press the battery button. One to
five lights glow to show the battery’s level of charge. One blinking light indicates that
the battery does not have sufficient charge to turn on.
5. Try known-good battery.
6. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
7. Replace DC-to-DC board.
8. Replace logic board.
Error Beeps
The computer automatically performs a power-on self test when it is turned on after being
fully shut down (not a restart). This section describes what to do if beeps are heard during
the startup.
Note: The computer has a memory expansion slot that accepts a 1.25-inch (or shorter)
PC-2100 compliant, SO-DIMM memory card. Refer to the Memory Replacement
instructions for removal and installation.
Computer beeps once at startup
1. One beep means that no RAM is detected.
2. If a RAM card is installed in the expansion slot, remove it and put in known-good and
compatible RAM and restart.
• If symptom does NOT repeat, replace RAM card.
• If symptom repeats, replace logic board.
3. If no RAM card is installed, replace logic board.
2 - PowerBook G4 (12-inch) Troubleshooting
Symptom Charts
Computer beeps three times at startup
1. Three beeps means that no RAM banks passed memory testing.
2. If a RAM card is installed in the expansion slot, remove it and put in known-good and
compatible RAM and restart.
• If symptom does NOT repeat, replace RAM card.
• If symptom repeats, replace logic board.
3. If no RAM card is installed, replace logic board.
Computer beeps four times at startup
1. Four beeps indicates a bad checksum for the remainder of the boot ROM. The ROM
(which is located on the logic board) is bad.
2. If a RAM card is installed in the expansion slot, remove it and put in known-good and
compatible RAM and restart.
• If symptom does NOT repeat, replace RAM card.
• If symptom repeats, replace logic board.
3. If no RAM card is installed, replace logic board.
Related article:
58442: Power On Self-Test Beep Definition - Part 2
Hard Drive
Hard drive will not initialize
1. Boot from Software and Restore DVD. Under the File menu, select Disk Utility, and
see if the hard drive appears on the list.
2. If no hard drive is found in Disk Utility, verify the hard drive cable connections.
3. Replace hard drive cable.
4. Replace hard drive.
Important: If the computer is under warranty and data recovery is required, refer to
Article 31077: Hard Drive Data Recovery & Warranty Implications, for important
information.
Symptom Charts
PowerBook G4 (12-inch) Troubleshooting - 3
The internal hard drive does not spin
1. Disconnect any connected peripherals.
2. Try known-good power outlet.
3. Try known-good power adapter and power cord.
4. Boot from Software and Restore DVD.
5. Verify Disk Utility does not recognize the hard drive.
6. Verify cable connections.
7. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
8. Replace hard drive cable.
9. Replace hard drive.
Keyboard
No response from any key on keyboard
1. Remove any connected peripherals.
2. Boot from Software and Restore DVD to verify that it is not a software problem.
3. Turn off the computer. Disconnect the keyboard connector and inspect connectors.
4. Replace keyboard.
5. Replace logic board.
Modem
No modem dial tone
1. Check that the correct modem is selected in the Network Preferences pane. In
Modem tab, check that sound is not turned off.
2. It is possible that the modem is connecting but not generating a sound. Check Internet
Connect to verify status.
3. Verify known-good analog (not digital) telephone line.
4. Verify known-good RJ11 telephone cable.
5. Verify RJ11 cable is not plugged into Ethernet port.
6. Inspect RJ11 connector and modem port for pin damage.
4 - PowerBook G4 (12-inch) Troubleshooting
Symptom Charts
7. Verify RJ11 telephone cable is firmly installed in the modem port.
8. If verifying the system functionality, in the Modem tab, deselect “Wait for Dial Tone
Before Dialing.”
9. Verify modem 2-pin connector is plugged into modem correctly.
10. Replace the RJ11 modem cable and port.
11. Replace modem.
Optical Drive
The optical drive does not accept CD or DVD disc (mechanical failure)
1. Verify disc is not warped.
2. Verify disc is not the wrong size. The computer will accept only 120 mm round disc.
Refer to article 58641 - Macintosh: Using Nonstandard Discs in CD-ROM or DVDROM Drives.
3. Replace optical drive.
The disc icon does not show up on the desktop, or a dialog box appears to
initialize disc
1. Verify the correct type of disc is being used.
2. Try cleaning the disc. It may not mount if dirty or scratched.
3. Try a different disc.
4. Create new Mac OS X user and log in as that user. (So that the customer does not
question the new user, remove the user once disc is verified.)
5. Reseat optical drive cable.
6. Replace optical drive cable.
7. Replace optical drive.
The optical drive does not eject CD or DVD disc
1. Verify disc is not in use.
2. Press and hold Media Eject key at top right corner of keyboard. If that does not work,
hold down Function (fn) key and Media Eject key.
3. Drag disc icon to trash or select it and press Command-E.
4. Choose Restart from Apple menu while holding down trackpad button.
5. Replace optical drive.
Symptom Charts
PowerBook G4 (12-inch) Troubleshooting - 5
Ports
The FireWire or USB port is not recognizing devices; or device not recognized
by computer
Note: If you are trying to use a serial device with a USB/Serial adapter, check with the
manufacturer of the adapter for compatibility.
1. Completely shut down, then press the power button to start the computer.
2. Use Software Update in Mac OS X system preferences to verify that the latest
software is installed.
3. Use Apple System Profiler to verify that the computer is recognizing the device.
4. For USB, test ports with a known-good Apple keyboard or mouse. Try different USB
device on same port.
5. For FireWire, test by connecting another computer in FireWire Target Disk Mode.
Refer to article 58583: How to Use FireWire Target Disk Mode.
6. If a camera, turn on the camera before opening the video application.
7. Verify current driver for the device is installed. Verify that drivers are installed properly
for third party, if needed.
8. Create new Mac OS X user and log in as that user. (So that the customer does not
question the new user, remove the user once disc is verified.)
9. Try other port if available.
10. Try a different cable. (Cable noise could be a problem.)
11. Eliminate chain by plugging in only one peripheral.
12. If self powered make sure that the power supply is connected and device's LED
indicates that it is getting power.
13. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
14. Replace logic board.
6 - PowerBook G4 (12-inch) Troubleshooting
Symptom Charts
Sound
Distorted sound from speakers
1. Verify sound is correct with external speakers/headphones. If sound is correct, replace
top case.
2. Check balance in Sound preference pane.
3. Replace rear panel assembly with attached speakers.
4. Replace subwoofer.
No sound from speaker(s)
1. Use the Software Update preference pane to verify that the latest software updates
have been installed.
2. Press the F3 key to verify that mute mode is not enabled.
3. Press the F4 or F5 key to check the volume setting.
4. Verify no external speakers or headphones are plugged in.
5. In the Sound preference pane confirm that only one device is listed in the Output tab.
6. Shut down computer and restart.
7. Reset PRAM (Press the power button, then hold down the Option-Command-P-R
keys until you hear the startup chime at least one additional time after the initial
startup chime).
8. Verify that the speaker cable is connected properly to logic board.
9. Replace top case.
10. Replace logic board.
Symptom Charts
PowerBook G4 (12-inch) Troubleshooting - 7
Startup
The computer will not power on
1. Make sure that power adapter connector is fully inserted.
2. Remove any connected peripherals.
3. Try known-good power outlet.
4. Try known-good power adapter and power cord.
5. Remove battery.
6. Press Caps Lock key to see if light on key comes on. If it does, hold power button
down for six seconds to shut down the computer and restart.
7. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
8. Remove any additional RAM
9. Remove AirPort Card.
10. Try known-good DC board.
11. Verify power button is connected properly to logic board, if power button is not
functioning correctly or damaged, replace the top case.
12. Replace logic board.
Display
No display, or dim display, but computer appears to operate correctly
1. Press F2 to increase the screen brightness setting.
2. Remove any connected peripherals.
3. Try known-good power outlet, power adapter and power cord.
4. Reboot the computer—hold down the Control and Command keys and press the
Power button, or press and hold the Power button for 5 to 10 seconds to shut down the
computer, then press the Power button to restart.
5. Verify backlight cable and LVDS cable connections are seated properly and that the
cables are not damaged (refer to display assembly replacement instructions).
6. Replace display assembly.
7. Replace logic board.
8 - PowerBook G4 (12-inch) Troubleshooting
Symptom Charts
Video (S-Video and Composite adapter)
No video on an external device
1. Make sure you are using the S-Video and Composite adapter cable.
2. Verify TV or VCR is set up properly with correct source.
3. Try different TV or VCR. Check owner’s manual for TV or VCR.
4. Replace adapter cable.
5. Replace logic board.
The display is rolling (PAL instead of NTSC)
1. Make sure you are not using Apple's A/V Video Cable.
2. Make sure you are using the S-Video and Composite adapter cable.
3. Go to Displays preference pane; change resolution from PAL setting to NTSC setting.
4. Try a different TV or VCR.
5. Try a different adapter cable
6. Replace logic board.
Display shows ghosting (signal reflection)
1. Verify that cables are correctly installed and firmly seated.
2. Replace video adapter.
Video (RGB adapter)
No video on an external device
1. Make sure RGB adapter cable is fully seated.
2. Click "Detect Displays" button to verify that monitor is being recognized in the Displays
preference pane, and is known-good and supported by this computer.
3. Try known-good RGB adapter.
4. Replace logic board.
5. Replace RGB adapter cable.
6. Replace logic board.
Display shows ghosting (signal reflection)
1. Verify that cables are correctly installed and firmly seated.
2. Replace video adapter.
Symptom Charts
PowerBook G4 (12-inch) Troubleshooting - 9
Misc. Symptoms
The computer runs with battery, but not with the power adapter plugged into
wall outlet
1. Try known-good power outlet.
2. Try known-good power adapter and power cord.
Note: Verify that power adapter connector glows amber or green. If the power
adapter light is green, turn over the computer and press the battery button. One to
five lights glow to show the battery’s level of charge. One blinking light indicates that
the battery does not have sufficient charge to turn on.
Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
3. Replace DC-in board
4. Replace DC-to-DC board.
5. Replace logic board.
The computer runs when plugged into a wall outlet but not on battery power
1. Reseat battery to verify battery is seated correctly with battery lock engaged.
2. Try known-good charged battery.
3. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
4. Replace DC-to-DC board.
5. Replace logic board.
10 - PowerBook G4 (12-inch) Troubleshooting
Symptom Charts
The cursor does not move when you are using trackpad
1. Verify that no USB device is connected.
2. Boot from a Mac OS system CD to verify that it is not a software problem.
3. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
4. Check trackpad cable and connection to the logic board (see separate Keyboard and
Top Case replacement instructions for location under top case).
5. Replace top case.
6. Replace logic board.
The cursor intermittently does not move or moves erratically
Note: User must touch with the surface of only one finger at a time and point directly down
on the trackpad surface.
1. Clean trackpad surface (with computer off, using a non-static-inducing material).
2. Completely shut down, then press the power button to start the computer.
3. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
4. Try unit on battery power. If problem goes away, replace power adapter.
5. Place a Mac OS system CD in the optical disc drive, press the start button and hold
down the "C" key. Check the cursor movement, to see if the problem is software.
6. Check trackpad cable and connection to the logic board (see separate Keyboard and
Top Case replacement instructions for location under top case).
7. Replace top case.
8. Replace logic board.
The microphone is not working
1. In the Sound preference pane select the Input tab. Make sure that the internal
microphone device is selected in the list.
2. In the Sound preference pane select the Input tab. Make sure that the input volume is
midrange or above.
3. In the Sound preference pane select the Output tab. Make sure the built-in audio
controller is selected.
Symptom Charts
PowerBook G4 (12-inch) Troubleshooting - 11
4. Create new Mac OS X user and log in as that user. (So that the customer does not
question the new user, remove the user once disc is verified.)
5. Reset PRAM (Press the power button, then hold down the Option-Command-P-R
keys until you hear the startup chime at least one additional time after the initial
startup chime).
6. Verify microphone cable connection to logic board.
7. Replace top case (which includes the microphone).
8. Replace logic board.
The latching mechanism that holds the display closed is not working
Note: As the display closes against the top case, a hook in the top of the display housing
should be magnetically pulled down into a slot in the top case, and secured. When the
latch button is pushed, the hook should release and retract into the display housing,
allowing the display to open.
1. Verify hook operation by exercising the latch mechanism.
2. If the hook does not operate properly, replace the display assembly.
3. If the latch or latch button does not operate properly, replace the bottom case
assembly.
12 - PowerBook G4 (12-inch) Troubleshooting
Symptom Charts