Apple ibook g4 12 inch mid 2005 User Manual

 
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iBook G4 (12-inch Mid 2005) Troubleshooting  Symptom Charts
10. If self-powered make sure that the power supply is connected and devices LED 
indicates that it is getting power.
11. Replace logic board. 
A USB 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. Try known-good Apple USB keyboard...

 
iBook G4 (12-inch Mid 2005) Troubleshooting -   
9
 
 Symptom Charts 3. Use the Software Update control panel to verify that the latest audio update has been 
installed.
4. Press the F3 key (with the fn key pressed and not pressed) to verify that mute mode is  not enabled.
5. Press the F4 or F5 key (with the fn key pressed and not pressed) to check the volume  setting.
6. Verify no external speakers or headphones are plugged in.
7. Shutdown computer and restart.
8. Replace top case.
9. Replace logic...

 
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iBook G4 (12-inch Mid 2005) Troubleshooting  Symptom Charts
8.
 
Important:  
 The AirPort Extreme/Bluetooth card has speci fic handling precautions. 
Make sure you review the section AirPort Extreme/Bluetooth Card in the Take Apart 
chapter before continuing.
Remove any additional RAM and AirPort Extreme/Bluetooth card.
9. Try known-good DC board.
10. Verify cable connections and check cables for damage.
11. Verify power button is connected properly to logic board, if power button is not...

 
iBook G4 (12-inch Mid 2005) Troubleshooting -   
11
 
 Symptom Charts 6. 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).
7. Connect an external display, and check for video on external display. • If video is fine on external display, troubleshoot LCD panel and verify \
cable connections to inverter and LCD.
• If video symptom is same on external display, replace logic...

 
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iBook G4 (12-inch Mid 2005) Troubleshooting  Symptom Charts
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...

 
iBook G4 (12-inch Mid 2005) Troubleshooting -   
13
 
 Symptom Charts 
Display shows ghosting (signal re flection) 
 
1. Verify that cables are correctly installed and  firmly seated.
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.
5. Replace logic board.  
Display shows ghosting (signal re...

 
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iBook G4 (12-inch Mid 2005) Troubleshooting  Symptom Charts 
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...

 
iBook G4 (12-inch Mid 2005) Troubleshooting -   
15  
 Symptom Charts keys until you hear the startup chime at least one additional time after the initial 
startup chime).
4. Remove and reseat memory card.
5. Try unit on battery power. If problem goes away, replace power adapter.
6. 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.
7. Check trackpad cable and connection to the logic board...

 
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iBook G4 (12-inch Mid 2005) Troubleshooting  Symptom Charts 
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...

iBook G4 (12-inch Mid 2005) 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 or
142 MHz MaxBus
PMU99
power controller
Trackpad
Keyboard
Power supply and charger
SO-DIMM connector
Graphics IC
32 MB DRAM
Flat-panel display
Audio
system
Ethernet PHY
FireWirePHY
PowerPC G4
microprocessor
(L2 cache: 512 KB)
512 MB on-board SDRAM
PCI bus
Boot
ROM
USB 2.0 port
USB 2.0 port
PCI...