Apple PowerBook G4 15-inch Spezifikationen PDF herunterladen (Seite 125)

PowerBook G4 (15-inch FW800) Troubleshooting - 7

General Information

PMU Reset pads on logic board

In addition to the power-on button pads on the logic board, there are pads for PMU reset.

These buttons work when their pads are shorted together (with a tool like the head of a ﬂat

blade screwdriver). They are marked PMU RESET. The pads are separated with a white

horizontal line between the pads.

These pads are located near the edge of the logic board, just above center of the hard

drive.

Caps lock LED power check

There are situations when the system is giving indications that it is shut down (no hard

drive access, screen is dark, no blower, and so on). However, the logic board may still be

running. In this case, the logic board is drawing power and generating heat.

Warning: In this situation, if the computer is put in an enclosed environment like a

carrying bag, the computer can overheat.

Check this situation by pressing the caps lock key. If the LED glows, the PMU is running on

the logic board. After pressing the caps lock key and perhaps other methods of waking it

up fails, hold the power button down for six seconds to force a shut down of the computer.

Restart the system to check if it boots up normally.

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Apple PowerBook G4 15-inch Spezifikationen Seite 125