Tom,
I used the easter egg method and swapped, the PMU board, and PRAM battery
and then followed the troubleshooting logic in the Apple service manual.
Once I had completed that and tried swapping the keyboard the service manual
suggests replacing the logic board. Looking at the system architecture in
the developers notes for this machine points to this chip as the culprit,
it's a high density package with lots of leads.
Tom and Lisa P wrote:
> >Hi
> >
> > I have 2 PB 3400 logic boards (a 180, & a 240) that exhibit similar
> >symptoms, the disease is acute sleeping sickness, the device that is
> >probably the cause is the PMU IC, a variation of the 68HC05 made for
> >Apple by Motorola. It's chip Number SC428009PV, 341S0187-B PMU, 1995
> >Apple, G73M0AVBZ9715. I have tried cross referencing everyone of these
> >numbers both on a Master Cross Reference List and on Motorola's list
> >with no joy, has anyone ever done any component level repairs on 3400's
> >and if so, who was your parts source?
> >
> >Thanks
> >Roger
>
> Roger, if the unit is not too many pins (can you describe it ?), a
> repair should be a snap. I suggest looking at other powerbooks to
> see if they have a similar part you can scrounge. PB 1400 and 5300
> are of the same vintage and the motherboards are relatively cheap.
>
> How did you deduce the problem was this IC ?
>
> Mad Dog
>
> PS: I got the PMO out today
>
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