iBook G3 12"

Model M6497 or A1005 / 500, 600, 700, 800, or 900 MHz G3 processor

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My iBook turns off when plugged into the AC adapter?

I got a new battery for my iBook, that would not charge or turn on when plugged into the AC adapter. With the working battery, I installed a fresh copy of OS 10.2 onto the new hard drive,

Unfortunately, the iBook does not turn on if it is plugged into the AC adapter. When it is on from the battery's power, plugging in the AC adapter immediately shuts it off.

I thought that resetting the PMU would help, but my model doesn't have a physical reset button, so I press the key combination. Pressing this combination results in the iBook powering down, but it would power down anways if I had just pressed the power button. I can't tell if I'm successfully resetting the PMU. After what should be a PMU reset, the iBook still does not power on when plugged into the adapter, and will still shut off once I do plug in the AC adapter

Any advice is greatly appreciated.

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Looks like a DC in board issue. What is your iBook model (speed in MHz) ?

You say: <<...When it is on from the battery's power, plugging in the AC adapter immediately shuts it off...>> That's why I would suspect a faulty DC in board.

To reset the PMU please check this link:

http://support.apple.com/kb/HT1431

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The scary thing is that I've already replaced the DC-in board already. My model is the iBook 900Mhz 12". I reset the PRAM and NVRAM, and PMU as per the instructions on Apples' support page. The timeline of trying to get this iBook working again was after I replaced the hard drive. When installing 10.2, the battery was getting low, so I plugged the AC adapter in, which caused it to shut off. Since then I've replaced the battery, the DC-In board, and the AC adapter with no success.

by JayCee

I guess you tried the AC adapter without the battery installed with the same result ? Last troubleshooting step would be to disconnect all the cables on the logic board but the video cable and trip the two pins in the power switch socket to boot the machine. If you still have the problem then the logic board is bad. I often test logic boards with nothing connected only an external monitor, heaphone (to hear the chime) and a known working dc in board. If the board boot to the question mark screen then most of the time the board is OK and something else is causing the problem.

by lemerise

Yes, with no battery and just the AC plugged in, it's the same result. I guess I might dissemble it once more, leaving only the display plugged in. You mention "tripping" the two pins (I know which ones they are though) that are responsible for the power button. How would I go about doing this?

by JayCee

simply disconnect the power switch cable connector (blue & white wires) from his socket then use a small jeweller flat screwdriver and briefly short the two pins inside the connector, the iBook should start. If everything is disconnected from the logic board I use headphone or external sound system to listen to the boot chime.

by lemerise

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Look at the tip of the AC adapter and see if it is broken off (if it is, the tip is probably in the DC IN port). Let me know and we'll go into replacement of this port.

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JayCee will be eternally grateful.

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