Re: Need for more expertise on IC's

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#1034

From: Jeroni Paul
Date: Wed, 24 Apr 2002 22:17

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Depends on the type of failure.
In some cases I had bad CMOS ICs and they revealed a few tens ohms of
resistace on the pins of the non-working parts, unlike properly working ICs.
I once had a switching supply regulator IC from a TV that was dead due to a
storm. The IC tested 0 ohm between all pins. A very high voltage went across
the IC, it also took some resistors and transistors along.

However if the short is inside the IC, it won't be detectable from the
outside. Doing a resistance checking in a comparison basis with a known good
IC may reveal something, but that is not usually a valid approach to
diagnose. If no differences are found, that does not mean the IC is in good
condition.

Jeroni Paul

"Jim Lazzaro" <jim_lazzaro@hotmail.com> wrote in
news:f666726f.0204240725.34887187@posting.google.com
> Has anyone ever been able to test any shorts on an IC?
>
> "A. Punnett" <ajpunnett@sympatico.ca> wrote in message
news:<3CC6541B.1D095F06@sympatico.ca>...
> > The IC is internally shorted.

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