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Logic board reset may repair non-functional FireWire
Authored by: dfa4 on Dec 08, '03 11:09:48PM
If possible, how does one reset the logic board on the Power Mac Cube? Would appreciate any assistance.

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Duane Andrews
http://www.people.cornell.edu/pages/dfa4

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Duane Fitzgerald Andrews
http://www.people.cornell.edu/pages/dfa4

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Logic board reset may repair non-functional FireWire
Authored by: johnsawyercjs on Dec 09, '03 12:12:27AM

To reset a G4 Cube's PMU:

• Unplug everything from the Cube (including its power supply), then remove the internal assembly from the Cube (turn the Cube upside down and press its plunger down until it unlocks, then pull up).
• Remove the video card and the riser card it's plugged into.
• Reinstall the riser card into the logic board (don't know why Apple says to do it this way, but that's what they say).
• Press switch S1 on the logic board, for about five seconds. It's a small, quarter-inch square part with a small black button in its center, along one edge of the logic board, not too far from one of the logic board's corners. You don't need to remove the battery, but if you have a current meter, measure the battery's current level, which is a more reliable way to tell if a lithium battery is good than measuring its voltage, which can still measure full voltage, but be unable to deliver any more current.
• Reassemble and see what happens.



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