Question about Apple PowerBook G4 Mac Notebook

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Won't Charge My computer's battery won't charge, I know it is not the battery because I just put a new one in it.  I believe the motherboard is bad because I've had this happen before where it won't charge but the power supply still keeps the computer alive.  Once the power supply is cut off the thing totally stops.  Is this definitely the motherboard and if so how much are motherboards for a Powerbook G4?

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  • Anonymous Nov 09, 2008

    I have tried all the resets the plu, the smc, all of them.; Not working. I tried replacing power supply and the battery. it charges in other powerbooks but not mine. I measured the output coming out of the battery port of the laptop the eight pins voltage is:(pin/voltage) 1/.703v 2/.703v 3/0v 4/3.29v 5/3.29v 6/3.16v 7/0v 8/0v. these are the readings wether the powerbook is on or off(just pluged in). Cn anyone help? Its a powerbook G4 1.5ghz

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Common fix for this problem is a simple Power Management Unit (PMU) reset. This will basically re-sync the battery "brain" to the computer so they when when to charge and when to stop. To do this, simply turn your computer off, remove battery and power cord and hold the power button down for 7-15 seconds. Then you MUST wait 15 seconds after pressing the button before applying power or inserting battery. 75% chance this will fix your problem. If Not, Replace Adapter/Charger. They have a microchip in them that can go bad that senses when to send more current to charge battery. Apple motherboards are generally better built so I'm not suspecting that at this moment. Let me know what you find out.

Posted on Jun 20, 2008

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