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28 - PowerBook G4 (17-inch) Troubleshooting
Hardware Symptom Charts
2. Check the keyboard backlight cable connection to the top case flex cable and the top
case flex cable connection to the logic board. If the connections look good, change the
top case.
3. Replace logic board.
Half keyboard is illuminated.
1. Check the keyboard backlight cable connection to the top case flex cable and the top
case flex cable connection to the logic board. If the connections look good, change the
top case.
Microphone
The microphone is not working
1. Check the Sound system preference pane and verify the selection under the Input tab
is for the built-in microphone.
2. Check the signal level and level meter and adjust the gain.
3. 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).
Warning: Resetting the PRAM will permanently remove a RAM disk, if present
and all of its contents. You will also need to reset the date and time (using the
Date & Time system preference pane).
4. If there is no sound output from the internal speaker as well as the microphone not
working, verify cable connections.
5. Replace sound board flex cable.
6. Replace the sound board.
7. Replace the speaker assembly.
8. Replace the logic board.