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PowerBook G4 (15-inch FW 800_1.5/1.33GHz) Troubleshooting - 25
Hardware Symptom Charts
No keyboard illumination
1. Go to Keyboard system preference pane and make sure the “Illuminate keyboard in
low light conditions” check box is checked. Try using system in a dimly lit environment.
Note: The keyboard illumination is not bright enough to be seen in most well lit spaces. In
order to view the key being illuminated, the ambient light needs to be dim.
2. Check the keyboard backlight cable connection to the trackpad flex cable, if bad,
replace the top case.
3. Replace logic board.
Half keyboard is illuminated.
Check the keyboard backlight cable connection to the trackpad flex cable and the trackpad
flex cable connection to the logic board. If the connections look good, change the top
case.