Power Button pads on logic board

With the top case removed, the power button is disconnected. Instead of having to reconnect the top case to turn on the system, there are two pads on the logic board that can be shorted across (with a tool like a flat blade screwdriver) to act as the power button.

These pads are located about 5cm left of the back left corner of the optical drive, 1-1/2cm above the notch for the top case flex cable. It is marked POWER BUTTON. The pads are separated with a vertical white line.

Note: The component designators my be different, but the location of the pads are the same as illustrated.

Powerbook Graphics Problems

Resetting the Power Manager Unit (PMU)

There are different methods to reset the PMU depending upon the computer. See appropriate computer headings below.

PowerBook G4 (17-inch Double-Layer SD) and PowerBook G4 (17-inch 1.67GHz):

The PMU reset key sequence has been changed. Use the following procedure or the PMU Reset pad (see PMU RESET pads on logic board, below).

  1. If the computer is on, turn it off.
  2. Disconnect the power adapter and remove the main battery.
  3. Hold the power button down for five seconds, then release.
  4. Install the main battery and connect the power adapter.
  5. Press the power button to restart the computer.

PowerBook G4 (17-inch 1.5GHz) and PowerBook G4 (17-inch 1.33GHz):

The PMU reset button has been removed from the logic board. Use the following key combination procedure or the PMU Reset pad (see PMU NMI and PMU RESET pads on logic board, below).

  1. If the computer is on, turn it off.
  2. Reset the power manager by simultaneously pressing and releasing Shift-Control-Option-power button.

Note: Do not press the fn (Function) key while using this combination of keystrokes.

  1. Wait 5 seconds.
  2. Press the power button to restart the computer.

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Responses

  • ROBEL NASIH
    Which key is the power key on a powerbook g4 17" 1.33?
    9 years ago
  • hana ermias
    How to reset the pmu powerbook g4 17" 1.67ghz?
    9 years ago
  • anacleto
    How turn on powerbook without top case?
    9 years ago
  • ruby took-brandybuck
    How to fix the vertical white line in my PowerBook g4?
    9 years ago
  • Zemzem
    How to turnon powerbook 17 without top?
    9 years ago
  • pauline
    Where is power reset button on powerbook g4 17?
    8 years ago
  • yohannes yohannes
    How to troubleshoot power supply of PowerBook G4?
    3 years ago

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