Apple ibook g4 14 inch late 2004 User Manual

							
 

iBook G4 (14-inch Late 2004) Troubleshooting - 
 
11
 
 Symptom Charts9. Replace LCD panel.
10. Verify cable connections and check cables around the hinges for damage.
11. Replace logic board.
 
When displaying a single color over the screen area, the LCD panel shows one 
or more pixels that are not properly lit
 
Active-matrix LCD technology uses rows and columns of addressable locations (pixels) 
that render text and images on screen. Each pixel location has three separate subpixels 
(red, green, and blue) that allow the image to be rendered in full color. Each subpixel has a 
corresponding transistor responsible for turning the subpixel on or off.
There are typically millions of these subpixels on an LCD display. For example, the LCD 
panel used in the Apple Cinema HD display is made up of 2.3 million pixels and 6.9 million 
red, green, and blue subpixels. Occasionally, a transistor does not work perfectly, which 
may result in the affected subpixel being turned on (bright) or turned off (dark). With the 
millions of subpixels on a display, it is quite possible to have a low number of faulty 
transistors on an LCD. Therefore, a certain number of subpixel anomalies is considered 
acceptable. Rejecting all but perfect LCD panels would signi
ficantly increase the retail 
price for products using LCD displays. These factors apply to all manufacturers using LCD 
technology—not just Apple products.
To determine whether or not the display has an acceptable number of pixel anomalies, 
follow the steps below:
1. Set the display image to one of the following colors: all-white display, all-red display,  all-green display, or all-blue display.
2. Using a jeweler’s loupe, pocket microscope, or other magnifying device, identify and  count each subpixel anomaly:
• Bright subpixel anomaly = subpixel that is always on
• Dark subpixel anomaly = subpixel that is always off
3.
 
Important:
 
 Check the number of subpixel anomalies with the following chart:
4. If the number of subpixel anomalies exceeds the acceptable number listed in the  chart, replace the LCD panel.
5. If the number of subpixel anomalies is acceptable, explain to the customer that the  pixel anomalies are within speci fications, and no repair is necessary. 
 
Important:
 
  Do not release the specifications to customers. Instead, inform them t\
hat 
 
LCD Size 
(inches) Acceptable Number of Subpixel 
Anomalies Replace the LCD Panel
 
Bright
Dark Combination BrightDark  Combination
12.1 to 15.2 up to 3 up to 5 up to 7 4 or  more 6 or more 8 or more 
						

							
 

12 - 
 
iBook G4 (14-inch Late 2004) Troubleshooting Symptom Charts
a certain number of subpixel anomalies is considered acceptable, and these factors 
apply to all manufacturers using LCD technology—not just Apple products.
 
Scrambled or distorted video
 
Check for video on external display.
• If video is fine on external display, replace LVDS cable.
• If video is scrambled or distorted on external display, replace LCD pane\
l.
 
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 Apples A/V Video Cable.
2. Make sure you are using the S-Video and Composite adapter cable.
3. In Mac OS X, go to the Displays system preference to change the setting.
4. Try a different TV or VCR.
5. Try a different adapter cable
6. Replace logic board.
 
Display shows ghosting (signal re
flection) 
 
1. Verify that cables are correctly installed and  firmly seated. Check cables for damage.
2. Replace video adapter.
 
Video (VGA adapter)
 
No video on an external device
 
1. Verify monitor that is used in testing is known-good and is supported by this computer.
2. Try known-good VGA adapter.
3. Replace logic board.
4. Replace VGA adapter cable. 
						

							
 

iBook G4 (14-inch Late 2004) Troubleshooting - 
 
13
 
 Symptom Charts5. Replace logic board. 
 
Display shows ghosting (signal re
flection) 
 
1. Verify that cables are correctly installed and  firmly seated. Check cables for damage.
2. Replace video adapter.
 
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 but\
ton. The 
battery lights should glow green and stay on if the power adapter is ope\
rating 
correctly.
3. Reset the power manager by pressing the key combination Control-Option-Shift- power. 
 
Warning: Make sure you do not hold down the fn key when resetting the 
power manager.
Warning: Resetting the power manager means you will also need to reset the 
date and time (using the Date & Time control panel).
 
4. Replace DC board. 
5. Replace logic board. 
Related article: 88133: iBook (Dual USB): Using PowerBook G4 Adapter
 
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-Shift-power. 
 
Warning: Make sure you do not hold down the fn key when resetting the 
power manager.
Warning: Resetting the power manager means you will also need to reset the 
date and time (using the Date & Time control panel).
 
4. Replace battery transfer board. 
						

							
 

14 - 
 
iBook G4 (14-inch Late 2004) Troubleshooting Symptom Charts
5. Replace logic board.
 
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-Shift-
power. 
 
Warning: Make sure you do not hold down the fn key when resetting the 
power manager.
Warning: Resetting the power manager means you will also need to reset the 
date and time (using the Date & Time control panel).
 
4. Check trackpad cable and connection to the logic board (see separate Top Case replacement instructions for location under RAM shield).
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-Shift- power. 
 
Warning: Make sure you do not hold down the fn key when resetting the 
power manager.
Warning: Resetting the power manager means you will also need to reset the 
date and time (using the Date & Time control panel).
 
4. 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).
5. Remove and reseat memory card.
6. Try unit on battery power. If problem goes away, replace power adapter.
7. 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.
8. Check trackpad cable and connection to the logic board (see separate Top Case  replacement instructions for location under RAM shield). 
						

							
 

iBook G4 (14-inch Late 2004) Troubleshooting - 
 
15
 
 Symptom Charts9. Replace top case.
10. Reseat the heatsink if it is not properly secured.
11. Replace logic board.
 
The microphone is not working
 
1. Check the signal level and level meter and adjust the gain.
2. 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).
3. Verify microphone cable connection to logic board, and check cable for damage.
4. Replace display assembly (which includes the microphone).
5. 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 top case assembly.
 
Fan fails
 
1. Check fan cable connection, and check cable for damage.
2. Replace fan.
3. Replace logic board.
 
Trackpad works intermittently
 
The trackpad operation can be affected by hand lotion, humidity, dangling jewelry, and the 
use of more than one  finger on the trackpad. 
1. Check for environmental factors such as humidity, hand lotion, or jewelry.
2. Clean the trackpad with a clean, dry lint-free cloth. 
Related articles: 17228: Portables: Jumpy or Erratic Trackpad Operation
58389: PowerBook and iBook: Trackpad Does Not Respond 
						

							
 

16 - 
 
iBook G4 (14-inch Late 2004) Troubleshooting Symptom Charts
 
Greasy substance in battery bay
 
A small amount of grease is used on the springs in the battery bay. Inform customers that 
the grease helps the springs operate correctly. The grease is not harmful and should not 
cause alarm. However, if it comes in contact with skin, wash it off with soap and water.
Refer to Knowledge Base article 88369: iBook: White Greasy Substance in Battery Bay. 
						

							
 

iBook G4 (14-inch Late 2004) Troubleshooting - 
 
17
 Symptom Charts
Block Diagram
External
display
connector
Ethernet port FireWire port
Internal
speakers Headphone port
Internal
microphone
AGP 4X
bus
Memory bus 133 MHz
MaxBus
PMU99
power controller
Trackpad
Keyboard
Power supply and charger
SO-DIMM connector
ATI Mobility
Radeon 9200 graphics IC
Flat-panel display
Audio
system
Ethernet PHY
FireWirePHY
PowerPC G4
microprocessor
(L2 cache: 512 KB)
256 MB on-board SDRAM
PCI bus
Boot
ROM
USB 2.0 port
USB 2.0 port
PCI USB
controller
AirPort
Extreme Card
ATA-100 bus
ATA-33 bus
Connector to internal
IDE disk drive
Connector to internal
optical drive
I
2S
12 Mbps USBModem port
Modem moduleBluetooth
Data pump and DAA
Intrepid
memory
controller and I/Odevice
controller 
						

							
 

© 2004 Apple Computer, Inc. All rights reserved.
 

 
 
 
Service SourceViews
 
iBook G4 (14-inch Late 2004) 
						

							
 

iBook G4 (14-inch Late 2004) Views - 
 
1
 
 
 
Slot-Load Optical Drive Side View
Ports Side View
Bottom Case View 
						

							
 

2 - 
 
iBook G4 (14-inch Late 2004) Views
 
iBook G4 (14-inch Late 2004): Main Exploded View
Keyboard
922-6637
Top Case
922-6621Bluetooth Cable
922-6188
Bluetooth Antenna
922-6256
Bluetooth Holder
922-6591
Top EMI Shield
922-6620
Frame
922-6619
SDRAM Memory
256 MB 661-3472
512 MB 661-3473
1GB 661-3474
Heatsink
922-6617
Fan
922-6618
Optical Flex Cable 922-6650
Bracket, Flex Cable 922-6616
Optical Drive:
Combo 661-3413
SuperDrive 661-3414
Bracket, Side 922-6175
Bezel, Slot
MKE 922-6264
Sony 922-6265
TEAC 922-6622DC-In Board
922-6649
Bottom EMI Shield
922-6258
Vent Cover
922-6180
Battery
661-3189
Bottom Case 922-6174
Battery Transfer Board 922-6183
Sleep Light Board922-6187
Bluetooth Board922-5764
922-6571 (Q6T)
RAM Shield922-6173
I/O Bezel
922-6172
RJ-11 Modem Cable 922-4815
Logic Board
1.33 GHz 661-3417
Hard Drive:
30 GB 661-3409
60 GB 661-3407
80 GB 661-3408
Modem
922-6430
Bracket,
Hard Drive
922-6262
Hard Drive Flex Cable 922-6184
Modem Shield
922-6640