[sdiy] Advice for Troubleshooting Intellijel Power Supply Please

[Shawn Rakestraw]

Thanks for the reply.

These are all SMD components and the capacitor is labeled C65 so I'm 99%
sure it is a ceramic capacitor. There is an "output stage" for each of the
power rails and each one has a similar layout. All three have a
resistor and capacitor placed vertically just before an inductor. The -12V
rail is the only one that seems like it is shorted to ground when doing a
continuity test with the meter. The resistor and capacitor in question are
between the mosfet and diode though (really big ones) and desoldering them
will prove to be a challenge. I would rather have some confirmation that
they are indeed the problem before trying to get them out of the hole they
are in.

On Wed, Feb 15, 2023 at 7:36 PM <mskala at northcoastsynthesis.com> wrote:

> On Wed, 15 Feb 2023, Shawn Rakestraw via Synth-diy wrote:
>
> > I found a ceramic capacitor between the mosfet and rectifier that seems
> > shorted, but I don't know if there is another part of the circuit causing
> > that or not. And I haven't tried removing the cap yet to test it off the
> > board.
>
> Are you sure that's a ceramic capacitor and not a polyfuse?  They often
> look similar, and the polyfuse will read as a low resistance.
>
> --
> Matthew Skala
> North Coast Synthesis Ltd.
>
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