Apple imac 17in 1ghz Manuales De Servicio
iMac (17-inch Flat Panel, 1GHz) Troubleshooting - 5
General Information
I/O Ports
The PMU Chip
The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for
the computer. The PMU (location shown below) is a computer within a computer. It has memory,
software, firmware, I/O, two crystals, and a CPU. Its function is to:
• Tell the computer to turn on, turn off, sleep, wake, idle, etc.
• Manage system resets from various commands.
• Maintain parameter RAM (PRAM).
• Manage the real-time clock.
the computer. The PMU (location shown below) is a computer within a computer. It has memory,
software, firmware, I/O, two crystals, and a CPU. Its function is to:
• Tell the computer to turn on, turn off, sleep, wake, idle, etc.
• Manage system resets from various commands.
• Maintain parameter RAM (PRAM).
• Manage the real-time clock.
Important:
The PMU is very sensitive and touching the circuitry on the logic board can cause the
PMU to crash. If the PMU crashes, the battery life goes from about five years to about two days if
the PMU is not reset. Refer to the next topic, “Resetting the PMU on the Logic Board” for the
procedure.
the PMU is not reset. Refer to the next topic, “Resetting the PMU on the Logic Board” for the
procedure.
Many system problems can be resolved by resetting the PMU chip.
Location of the PMU Button