Be sure you have power to ground shorts and not a shorted capacitor.  I've known many a good technician who spent days trying to isolate a short only to prove it was a by-pass cap.

Don Vischulis

-----Original Message-----
From: Krishnan C <[log in to unmask]>
Sent: Sep 18, 2003 2:29 AM
To: [log in to unmask]
Subject: [TN] Inner Layer Ground Shorts

Hi Technetters,

Can any of the technical Gurus from the PWB Fab or related industry
enlighten how & why the inner-layer power/GND shorts occur & how they can
be detected after the boards have been laminated. Of course I do understand
that when you are building boards with very tight tolerances, fine lines
thin cores the probability of these type of shorts occurring is quite high.
However we have days when we have zero GND shorts & days with upto 5%. We
have looked into all potential problems, but maybe we are still missing out
something, so if someone out there can enlighten me it will be very much
appreciated.

Thanks,
Krishnan.C
Sanmina-SCI

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