Dodgy IBM PC Convertible power supply

[Tony Duell]

> 
> Tony Duell wrote:
> 
> >>>Assuming this is an electronic problem, I would first test all the
> >>>electrolytics on an ESR meter. High-ESR capacitors cause the most odd
> >>>faults on SMPUSs...
> >>
> >>I'll need to find one...
> > 
> > 
> > There have been many projects for these in the UK magazines, I would be 
> > suprised if you couldn't find such a projected Stateside. And a google 
> > search should turn up suppliers of ready-built instruments.
> 
> I don't like to waste time with these things.  If I see one dodgy 
> electrolytic, I do the lot (at least of that size/value/voltage).

And if some 'genius' has used one as the timing capacitor on a one-shot, 
you've probably just introduced a fault by replacing it (if the original 
one was still OK)... Not a problem in most PSUs, I'll admit.

You still need the ESR meter to prove you had a capacitor problem in the 
first place, of course.

-tony