There is a fuse in many of them, mostly a soldered pigtail type. You might
(carefully) locate it and (with power disconnected) desolder one side and
run a continuity test of the fuse. Another thing to test is the paddle
switch for continuity. If it's the fuse then go to a local TV shop or Radio
Shack and get a replacement of the same size. If it's the paddle switch many
places still have replacements - takes about 5 mins to replace and costs
about $4.
> -----Original Message-----
> From: owner-classiccmp_at_classiccmp.org
> [mailto:owner-classiccmp_at_classiccmp.org]On Behalf Of steve
> Sent: Tuesday, April 24, 2001 11:37 AM
> To: classiccmp_at_classiccmp.org
> Subject: Re: Need IBM Portable 5155 power supply
>
>
> Hi!
>
> I am testing the PS while still installed in the 5155.
> There are no voltages going to the motherboard.
>
> I don't have any experience in fixing these things,
> although I'm guessing that it's some power transistor
> that's gone out.
>
> Steve.
>
>
> --- Tony Duell <ard_at_p850ug1.demon.co.uk> wrote:
> > >
> > > Hi,
> > >
> > > The PS in my IBM Portable seems to be dead.
> >
> > How are you testing it? Most IBM PC PSUs of that
> > period need a load
> > before they will start up. The PSU on its own will
> > appear to give no outputs.
> >
> >
> > >
> > > I would appreciate it if someone could send me a
> > new
> > > PS!
> >
> > Would you be interested in having a go at repairing
> > the existing PSU.
> > From what I remember it's a fairly conventional
> > SMPSU, similar to the one
> > in the PC/XT machine. You'll need bristol spline
> > keys and tamperproof
> > torx drivers to get inside, though, and at least a
> > multimeter for
> > troubleshooting (a 'scope and isolating transformer
> > are useful!). You'll
> > need the bristol spline keys to get the whole PSU
> > unit out of the 5155, BTW.
> >
> > If you do decide to go inside, remeber there are
> > dangerous voltages in
> > there. Much of the circuitry is not isolated from
> > the power line. And
> > there are capacitors that charge up to a total of
> > 400V (and when the unit
> > is operational, that circuit can easily supply
> > enough current to kill
> > you!). Take great care if you do pull the cover.
> >
> > -tony
>
>
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Received on Tue Apr 24 2001 - 12:04:11 BST