Machine: PowerBook G4 17″
Symptom: When the screen is moved, the backlight to the screen flickers or cuts out.
Likely Cause: Damaged backlight cable.
The backlight cable provides the power to the LCD’s backlight.
The cable runs from the logic board (1) through the left side of the hinge (2) and into the inverter board which in turns connects to the LCD.
The backlight cable runs through the hinge with the bluetooth and airport cable.
Over time, the hinge can get loose and the backlight cable can become worn causing the connection to cut in and out.
To solve the problem, the hinge is tightened (or replaced depending on damage) and a new cable is installed (with more protection.)
Since most customers initially believe the issue is with the screen or logic board, they’re happy to learn it’s only a cable. This repair itself is quite involved but the end results are perfect.
[ MyService Free Diagnostic ] Suspect your PowerBook has this issue? We can help.