Apple PowerBook - Page 34

Video
PowerBook (FireWire)
12
Troubleshooting
7. Replace inverter board.
8. In the US, contact Apple Technical Support.
9. Replace display cable (international only).
10. Replace display (international only).
11. Replace I/O logic board.
An external monitor connected to the computer
shows no video
1. Verify external monitor has power.
2. Try different resolutions in the Monitors control panel.
3. Try another monitor cable and verify the video
adapterhas part number 590-1123 on the adapter.
4. Try another monitor.
5. Restart unit and reset PRAM.
6. Replace I/O logic board.
An external monitor connected to the computer
shows either horizontal or vertical rolling, or
horizontal or vertical distortion
1. Try different resolutions in the Monitors control panel.
2. Verify monitor using another computer.
3. Try another video adapter and verify the video
adapterhas part number 590-1123 on it.
4. Replace I/O logic board.
Backlight doesn’t operate; screen is very dim
1. Adjust screen brightness setting.
2. Verify that backlight cable connection is secure.
3. Check display cable and inverter board connections to the
I/O logic board.
4. Verify that inverter cable is properly connected and that
cable is good.
5. Verify that cables are not pinched or severed.
6. Replace inverter board.
7. In the US, contact Apple Technical Support.
8. Replace display (international only).
9. Replace I/O logic board.