How to work out unknown PSU replacement

Kyle Owen kylevowen at
Sun Nov 4 15:48:16 CST 2018

On Sun, Nov 4, 2018, 16:23 Mike Stein via cctalk <cctalk at>

> ----- Original Message -----
> From: "Adrian Graham via cctalk" <cctalk at>
> To: "General Discussion: On-Topic and Off-Topic Posts" <
> cctalk at>
> Sent: Saturday, November 03, 2018 4:59 AM
> Subject: Re: How to work out unknown PSU replacement
> ...
> > Today I’ll break out the ’tin foil covered sponge’ method of tracing any
> other points on the board that I might have missed last night.
> ---
> "Tin foil covered sponge" ???

Connect one lead of the multimeter to some pin/net you want to trace. Then,
connect the other lead to a foil-covered sponge (or metallic brush) and
brush it over the PCB backside, stopping when you hear the continuity
alert. Not useful generally for big nets that connect everywhere, and not
very useful for SMT boards; good for through-hole stuff though.



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