Re: Vcc buss rails being pulled down.

Thanks guys for all the input...

I think I'll do a combo attack. First remove
the caps, try the 'over current trick' (just bought
a 30 VDC 5A adjustable power supply from Ebay) or
isolate the different nodes and cut a few traces.

I'll also look on Ebay for an HP 547A current probe.
If anyone has used one, some usage tips would be nice.

It would be cool to use a thermal imaging device,
but I only know a few friends I could ask of this.

Todd

----- Original Message -----
From: "Clay Cowgill" <c.cowgill@comcast.net>
To: vectorlist@vectorlist.org
Sent: Tuesday, October 18, 2011 12:24:41 PM GMT -06:00 Central America
Subject: RE: VECTOR: Vcc buss rails being pulled down.

If you happen to know anyone that does home inspections-- see if they'll
drop by with their thermal imager. (Basically the high-tech version of the
color-change sheet Chris mentioned.) When the board is cool a short ramps
up temperature *really* fast, so watch the screen and power up the board and
you'll basically see it 'go nova' on the imager. It's kinda neat-- you can
see the entire power trace connected to the part in question 'light up' too.

They're also very handy on smaller electronics now when parts are tiny and
close together and it's tough to tell what's getting hot with a finger or IR
thermometer... Alas, they're still quite expensive for 'good' cameras, but
it's a really interesting tool to have if you can justify the price (or
better-- know of one you can borrow once in a while ;-).

-Clay

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Received on Tue Oct 18 19:54:55 2011