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PowerBook G4 (1GHz/867MHz) Troubleshooting - 15
Video Symptom Charts
7. 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 control panel).
8. Verify that the speaker cable is connected properly to logic board.
9. Check speaker cable. Verify left and right cable connections.
10. Check with headphones or external speaker, if audio is heard, replace heat exchanger
with speaker wire assembly.
11. Replace top case.
12. Replace logic board
Distorted sound from speakers
1. Verify sound is correct with external speakers/headphones. If sound is correct, check
speaker wire and connections.
2. In Mac OS X check balance.
3. Compare same sound with two different units to make sure that sound is actually
distorted.
4. Check speaker wire. If damaged, replace heat exchanger with speaker wire assembly.
5. Replace top case.
6. Replace logic board.
Video
No display, or dim display, but computer appears to operate correctly
1. Remove any connected peripherals.
2. Make sure F1 key is not stuck down.
3. Press the F2 key (with the fn key pressed and not pressed) to increase the screen
brightness settings.
4. Reboot the computer—hold down the Control and Command keys and press the
Power button to restart the computer. Or, press and hold the Power button for 5 to 10
seconds to shut down the computer, then press the Power button to restart.
5. Make sure using the PowerBook (1GHz/867MHz) power adapter (661-1798)
6. Verify inverter flex cable and LVDS cable connections are seated properly and that the
cables are not damaged (refer to inverter board and display module replacement
instructions).