The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for this computer. The PMU is a computer within a computer. Its function is to:
Important: Be very careful when handling the logic board. The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the PMU crashes and is not reset, the battery life goes from about Ave years to about two days.
Many system problems can be resolved by resetting the PMU chip. When you have a computer that fails to power up, follow this procedure before replacing any modules:
Warning: Do not press the PMU reset switch a second time because it could affect the PMU chip. S1 is located on the logic board, under the video card, near the edge of the logic board at the end opposite the video ports.
Important: This procedure resets the computer's PRAM. After resetting the PMU, be sure to reset the time, date, and other system parameter settings.
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