[Duo2400] Re: Duo 2400 powerboard reliability problems

[Art Rice]

That's good information. I tried to find a schematic
diagram, but have been unsuccessful. The "service
manual" only shows how to take the 2400c apart. The
Apple developer site didn't have a schematic either. I
have no way of knowing which IC is the regulator, so
can't recommend which one to add a heatsink to. I
don't think the 2400 has a fan like some other
notebook computers, and there is probably no room to
add one. It would reduce battery life also! I guess
thats the price to pay for such a small footprint.

--- fpentney <fpentney at timemanage.com> wrote:
> Yes, there is a fuse. Cost $1 for the part and 45
> mins to replace. I had mine
> replacedafter a GLOD, rather than going through the
> usual motherboard repairs, DTT
> etc. The "Do it Yourself" repair guide was provided
> by a list member and I believe
> has been posted on the 2400 main site (Univ. of
> Waterloo). I would like to hear about
> more people trying this method.
> 
> Fred from Toronto, ON,  Canada
> 
> Tom and Lisa P wrote:
> 
> > >Hi all,
> > >I've been reading the DuoList for several months
> now
> > >and learned of the 2400 GLOD problems. I'm
> curious if
> > >anyone has looked at the design and tried to
> improve
> > >on it? My thoughts are:
> > >1) If it's heat related, the regulator IC may
> need a
> > >better heatsink. The AC adapter puts out 24 Volts
> and
> > >has to drop it to 12 and/or 5 Volts. That is a
> lot of
> > >power to dissipate. The old linear regulators (if
> > >thats what it has) have to continuously dissipate
> > >P=V*I watts. I don't know how much current the
> 2400
> > >draws, but if there's room to add a heatsink, it
> would
> > >be good preventative maintainence.
> >
> > Which IC is the regulator ?
> >
> > >2) Does the powerboard have OVP (over voltage
> > >protection) and a fuse? If the regulator did
> fail,
> > >hopefully an OVP circuit would take over and
> clamp the
> > >voltage to a safe value that wouldn't kill the
> logic
> > >board!
> > >3) I don't own a 2400, but I have a 2300c. Does
> anyone
> > >know if they have the same powerboard reliability
> > >issues?
> >
> > Not as far as I know.
> >
> > Mad Dog
> >
> > ----------
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> > ----------
> > Dr. Bott  | 10/100 Ethernet for your 2400 is
> finally here!
> > MPC-100   |
> <http://www.drbott.com/prod/mpc100.html>
> >
> >   RoadTools $30 PodiumPad available at Apple
> retail stores, $20 Traveler
> >   CoolPad at Staples. Both in white for iBooks at
> <http://roadtools.com>
> >
> > Midwest Mac Parts  ][  <http://www.midwestmac.com>
> > After-market parts  for Macs.   ][  888-356-1104
> ][
> >
> > MacResQ Specials: LaCie SCSI CDR From $99!
> PowerBook 3400/200 Only $879!
> > Norton AntiVirus 6 Only $19! We Stock PARTS!
> <http://www.macresq.com>
> 
> 
> 
> 
> ----------
> Duo/2400 List, The friendliest place on the Net!
> A listserv for users and fans of Mac subportables.
> FAQ at
>
<http://www.themacintoshguy.com/lists/DuoListFAQ.shtml>
> Be sure to visit Mac2400!
> <http://www.sineware.com/mac2400>
> 
> To unsubscribe, E-mail to:
> <DuoList-off at lists.themacintoshguy.com>
> To switch to the DIGEST mode, E-mail to
> <DuoList-digest at lists.themacintoshguy.com>
> Need help from a real person? Try. 
> <DuoList-request at lists.themacintoshguy.com>
> 
> ----------
> Dr. Bott  | 10/100 Ethernet for your 2400 is finally
> here!
> MPC-100   | <http://www.drbott.com/prod/mpc100.html>
> 
>   RoadTools $30 PodiumPad available at Apple retail
> stores, $20 Traveler 
>   CoolPad at Staples. Both in white for iBooks at
> <http://roadtools.com>
> 
> Midwest Mac Parts  ][  <http://www.midwestmac.com>  
> After-market parts  for Macs.   ][  888-356-1104 ][
> 
> MacResQ Specials: LaCie SCSI CDR From $99! PowerBook
> 3400/200 Only $879! 
> Norton AntiVirus 6 Only $19! We Stock PARTS!
<http://www.macresq.com>


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