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 - 11:36:50 BST