PowerBook G4 17" inverter board problem

Discussion in 'PowerPC Macs' started by TiHKaL, Nov 11, 2010.

  1. macrumors newbie

    Nov 11, 2010
    Hi I have a PowerBook G4 17" 1.33Ghz with display problems.

    The backlight no longer works. I can see that the screen is still displaying an image and the Mac works with an external monitor.

    Whilst searching around I found that one of the pins from the logic board socket isn't supplying +5v to the inverter board. The cable is good and I have also replaced the inverter board.

    I've tested the voltage of the inverter board connection socket on the logic board. This is what I get.

    Pin 1 : Ground
    Pin 2 : +12v
    Pin 3 : 0v (ground)
    Pin 4 : 0.09v Should be +5v
    Pin 5 : 1v (Ranges from 0-4v to dim display)

    Would it be possible for me to pull a +5v feed from elsewhere on the logic board to power the inverter and if so where would be a safe place to get it from.

    My first thought was one of the fans but I don't know if this will be safe or not.

    Thanks in advance for any advice

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