----- Original Message ----- From: "Kyle Owen via cctalk" <cctalk@classiccmp.org> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk@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@classiccmp.org> wrote: > > ----- Original Message ----- > From: "Adrian Graham via cctalk" <cctalk@classiccmp.org> > To: "General Discussion: On-Topic and Off-Topic Posts" < > cctalk@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! >
