Macpower & Tytech IceCube Spezifikationen PDF herunterladen (Seite 129)

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.

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Macpower & Tytech IceCube Spezifikationen Seite 129