Re: Messed up my Black Widow

The more I think about it the more I like the idea of a lead on the BACK of
the board shorting to something.
On Jul 2, 2012 12:33 AM, "Personal" <jehuie@sbcglobal.net> wrote:

> Well I tried the video camera in night-vision mode but couldn't really see
> anything at all. This was still with all the sockets chips removed. But I
> ran my fingers all over the pcb while it was powered up and the only
> components that felt warm to me we're the two voltage regulators.
>
> Not sure if that is useful or not....
>
>
> Sent from my iPhone
>
> On Jul 1, 2012, at 8:47 PM, Joel Rosenzweig <joel@helitronix.com> wrote:
>
> > I think that because the board has what appears to be a direct short, we
> won't see any potential difference at any of the nodes. But as Rodger
> pointed out, whatever part is responsible for shorting out the board, has a
> good chance that it's getting hotter than all the rest, and it should show
> up either with a non contact thermal infrared thermometer, or using the
> method he described. You could probably use a video camera in "night
> vision" mode to view the infra red signature, but there might not be enough
> dynamic range to tell the difference between the shorted part running hot
> vs. the other parts. It's just something you'd have to try. At least the
> non contact thermal infrared thermometers are a commodity, and can be had
> for short money.
> >
> > Joel
> >
> > On Jul 1, 2012, at 11:24 PM, Christopher X. Candreva wrote:
> >
> >> On Sun, 1 Jul 2012, Joel Rosenzweig wrote:
> >>
> >>> You could have an integrated circuit that has failed, causing the
> short.
> >>> I've had failures with the TL082's (for example) that took the whole
> board
> >>> down due to an internal short. These are very tricky to find. I don't
> know
> >>> how to effectively troubleshoot that without removing parts one at a
> time
> >>> (or at least lifting the Vcc leg).
> >>
> >> I wonder if it would be possible to do a nodal analysis ?
> >>
> >> For those who didn't take (or forgot) circuits 101, this involes simply
> >> measuring the voltages at various points in the circuit (called nodes,
> hence
> >> the name). I remember years ago fixing a WG color vector monitor,
> because
> >> Atari printed nodal voltages on the schematics (probably exactly for
> this
> >> purpose). With the help of people on this list I was able to determine
> where
> >> my boards voltages differed from the schematic, and what was the likely
> >> failure based on this.
> >>
> >> So the first quesion would be, do the Black Widow (Gravitar) schematics
> have
> >> nodal voltages on them anywhere that would be usefull ?
> >>
> >>
> >> ==========================================================
> >> Chris Candreva -- chris@westnet.com -- (914) 948-3162
> >> WestNet Internet Services of Westchester
> >> http://www.westnet.com/
> >>
> ---------------------------------------------------------------------------
> >> ** Unsubscribe, subscribe, or view the archives at
> http://www.vectorlist.org
> >> ** Please direct other questions, comments, or problems to
> chris@westnet.com
> >
> >
> ---------------------------------------------------------------------------
> > ** Unsubscribe, subscribe, or view the archives at
> http://www.vectorlist.org
> > ** Please direct other questions, comments, or problems to
> chris@westnet.com
> ---------------------------------------------------------------------------
> ** Unsubscribe, subscribe, or view the archives at
> http://www.vectorlist.org
> ** Please direct other questions, comments, or problems to
> chris@westnet.com
>

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Mon Jul 2 01:40:22 2012