TiBook shuts down when AC is plugged in

[applefan1997]

I posted a similar problem a while ago with this computer, but after some trial and error, narrowed it down to this.

The powerBook starts up with a battery, but as soon as I plug in the adapter, the machine shuts down, and I have no idea why. Unplugging it allows it to start again, only on th ebattery. The computer is a first revision 400MHz model.

Any help is appreciated!

 

[666sheep]

It could be faulty adapter or faulty DC board. Is your adapter charging battery properly when computer is off? Did you try to start without battery, only with adapter plugged in?

 

[applefan1997]

The AC adapter is good, as I've used the battery and adapter from another G4 as well. I guessed it was the dc board, as if it's shorting out, and some whining sounds come on at least if i try to start it up. I think it's soldered to the logic board, unlike the later models however.
Thanks!

 

[applefan1997]

Sorry to bring back an old topic, but I've been able to diagnose it a little further.

The DC jack is indeed soldered to the motherboard, but I don't think that's the cause of the problem.

The whining sounds seems to be coming from the PMU board, and when I disconnect the PRAM battery, it subsides but the issue never changes.

So, should I replace the PMU to give it another shot?

 

[iThinkergoiMac]

Have you tried resetting the PMU?