PowerbookG4 Runs on Battery But Won't Recognize/Recharge with Power Supply

My 15" 1.67gh Powerbook G4 will run just fine from battery power. The power supply does not charge the battery, though the amber light does turn on when it's connected. The screen power management display acts as if it's unplugged and doesn't recognize the plugged in power supply.
I have another G$ so can recharge the battery, and the power supply cord works fine in that one. I have tried the 5 second reset method (with the power supply and battery out)
This machine was used with an old battery that caused overheating during the summer to the point where the computer turned itself off.
Is the internal power supply fried? Is there a fuse that can be replaced? Is there some kind of other software/firmware procedural fix that I can try?
How much do these cost if I have to have it fixed? Is it worth doing for a computer this old? Can I just buy the part and try to install it? Is there a way to get it properly diagnosed without spending a ton of money?

There are 4 components to the charging circuit: power adapter, DC-in card, battery, and logic board. Unfortunately there is no automated test to determine what is causing any charging issues, so you have to solve it by elimination.
Since you have a working power adapter that will charge the battery on another PowerBook, that's good. And the system runs on battery power alone, so the battery sounds OK. That leaves either the DC-in card or the logic board as suspect. DC-in card would be the less expensive component to change, as they run $75-$95. A replacement logic board can run $300-$400. Those are used parts prices only without labor.
You could take your system to an Apple store, or better yet call them first, to see if they are even still repairing Powerbooks. If yes, see if you can have it sent to the Apple depot for repair (assuming you're in the US). As long as the case isn't banged up, it should run around $350 to have whatever is wrong fixed. If the case is banged up, it can run into the $650 range as they'll replace the case too. Comes back with a 90 day warranty. If they do the repair in the store, the price goes up... a logic board replacement in the store is around $750, as I recall. If you go this route, ensure you have a hard drive backup too before sending it off.

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