How to work out unknown PSU replacement

[Mike Stein]

----- Original Message ----- 
From: "Kyle Owen via cctalk" <cctalk at classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
Sent: Sunday, November 04, 2018 4:48 PM
Subject: Re: How to work out unknown PSU replacement


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

>
> ----- Original Message -----
> From: "Adrian Graham via cctalk" <cctalk at classiccmp.org>
> To: "General Discussion: On-Topic and Off-Topic Posts" <
> cctalk at classiccmp.org>
> 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.

Kyle
----------------
Neat trick; surprised I'd never heard of it before in my decades of trouble-shooting. Then again, at my advanced age and senility I might just have forgotten... ;-)

Thanks!
>