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September 2007

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Subject:
From:
"Victor G. Hernandez" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 5 Sep 2007 07:28:41 -0500
Content-Type:
text/plain
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Are there any of the following on the PWB near this exothermic event
site?   
   -  Ground holes with retaining screws
   -  Narrowing of voltage planes
   -  Internal planes too close to keep out zone
   -  Please review PWB drawing.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Wednesday, September 05, 2007 6:33 AM
To: [log in to unmask]
Subject: Re: [TN] Help needed on motherboard failure analysis

Hi Gil,

I have seen this sort of failure a few time, although not that dramatic,
and they were attributed to CAF. The product passed burn-in and testing
after assembly, then failed months later in the field. A cross section
from a similar hole, near the failure site, one that is not damaged, may
demonstrate a laminate crack, delamination or crazing. If there is a
pathway (crazing, dielectric cracks), a CAF type failure mode may
develop in humid, thermal cycling environment.


Sincerely,

Paul Reid

Program Coordinator

PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario
Canada, K2H 9C1

613 596 4244 ext. 229
[log in to unmask] <mailto:[log in to unmask]> 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Zilber Gil
Sent: Tuesday, September 04, 2007 1:26 PM
To: [log in to unmask]
Subject: [TN] Help needed on motherboard failure analysis


Hi,

Recently one of our motherboard failed. It reaches very high temperature
that melts the copper and explodes shooting (from the side of the board)
the melt copper to over 20 cm. the shooting hole cause delamination of
the board in the area. A lot of black smoke and was also seen. The max
voltage of the board is about 50V. The board worked fine for more then a
year. What could be the failure mechanism? Could it be due to conductive
filament formation (although the PCB should be free of that)?

Thanks

Gil Zilber
Elta Systems

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