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April 2016

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Subject:
From:
Vladimir <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Vladimir <[log in to unmask]>
Date:
Fri, 8 Apr 2016 12:43:29 -0400
Content-Type:
text/plain
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text/plain (89 lines)
Hi Steve,

We do it on a regular base for our customers including few cases similar to yours.

Please contact me off line.

Regards,

Vladimir 
SENTEC Testing Lab

Sent from my BlackBerry 10 smartphone on the Rogers network.
  Original Message  
From: David Hillman
Sent: Friday, April 8, 2016 12:18
To: [log in to unmask]
Reply To: TechNet E-Mail Forum
Subject: Re: [TN] Recommendations for Failure Analysis / Root Cause of PCBA Failure...

Hi Steve - yes, you have enough physical details that a lab that routinely
conducts FA work on electronic assemblies (there are several who are part
of Technet) would have a reasonable chance of finding the root cause. At a
very minimum with the details you have on this issue, the laboratory should
be able to rule out possible root causes even if they can't find a specific
root cause. I didn't see any dendritic shorting - is the belief that the
shorting is internal to the pwb?

Dave Hillman
Rockwell Collins
[log in to unmask]


On Fri, Apr 8, 2016 at 11:00 AM, Steve Gregory <[log in to unmask]> wrote:

> Good Morning All,
>
> We have an assembly that we build here for a customer that we built for
> some time, over 2,000 assemblies. There have been some failures that our
> customer has had field returns with that are beginning to escalate. There
> have been 12 field failures that we know of. The failures are avionic
> assemblies that have been in the field ranging from 111 days to 472 days.
> The actual failures are internal +12V to -12V shorts and we need to know
> why. I have two failed assemblies here. Here are a couple of external
> photos of a via that shows the short:
>
> http://stevezeva.homestead.com/Internal_Short.jpg
>
> http://stevezeva.homestead.com/Internal_Short_Close.jpg
>
> So my question is, can a lab take these boards and examine them to
> determine what the root cause actually is from the two assemblies that I
> have, or does there need to be more samples? What is the range we should
> expect to pay for this type of analysis?
>
> We're trying to work with our PCB vendor on this issue, but I have also
> been asked by my boss to pursue this with a third party.
>
> Thanks!
>
> Steve
>
>
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