Specifications

PowerBook G4 (12-inch 1.33 GHz) Troubleshooting
Symptom Charts
8. Check trackpad cable and connection to the logic board (see separate Keyboard and
Top Case replacement instructions for location under top case).
9. Replace top case.
10. Reseat the heatsink if it is not properly secured.
11. 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.
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 bezel.
3. If the latch or latch button does not operate properly, replace the bottom case
assembly.
Fan fails
1. Check fan cable connection, and check cable for damage.
2. Replace fan.
3. Replace logic board.