Powerbook alternates between battery and adapter when plugged in

The other day my PB started alternating between battery and adapter when plugged in: the symbol changes from batt to charging every few seconds, brightness goes up and down. I've managed to find a position where it will actually charge. I even tried a new adapter, but it's still extremely temperamental.
I'm afraid there's something wrong with the internal power jack, but is there anything else it could be? Any way to tweak the jack?
Thanks!

No, there's no way to "adjust" the port. It's soldered to a small Sound/DC-In card inside the Powerbook. What's apparently happened to yours is that the cord has been jerked rougly up, down or sideways one time too many, and one or more of the solder joints has broken. Because it's now able to move, however slightly, the rest of the joints are also being stressed every time you connect or disconnect the cord. Sooner or later another will break, then another. You'll end up having to replace the card when you can no longer shim or jimmy the port so it makes proper contact.
If you're very good at very small-scale soldering, you could take the card out and try to repair it, but if you're an average ham-handed Joe like me, replacing the board is a better bet. Getting to it, while not actually difficult, is a pretty considerable adventure in an Albook, because nearly everything else has to be removed from the case first to reach it.

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Powerbook alternates between battery and adapter when plugged in

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