[sdiy] How do you find the cause of a short ?

[Dave Brown]

Visual inspection with a high power magnification
X-Acto knife, divide and conquer.  Power planes make this impossible.
Use a current-limited supply and heat it up.  In the old days we would spray
the board with cold spray and see what heated up first.  Now you can use a
fancy IR camera.
Use a current limited supply and trace the current with a positional current
probe.  A quick Google search found this one.
http://www.tti-test.com/go/iprober/index.htm  You must be really bad to
spend the big bucks for a short tracer.

Dave 


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Dan Snazelle
Sent: Saturday, September 15, 2012 8:33 AM
To: *SYNTH DIY
Subject: [sdiy] How do you find the cause of a short ?

I have a couple boards which are beeping on the continuity test between the
positive rail and ground.


I cant find any bridged traces with a magnifying glass. Maybe a bypass cap
blew? Or maybe......

But i have no idea how to figure out what might be the culprit.

I disconnected the power supply and the problem persists.


Thanks for any advice!!






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