THANK YOU everyone for taking the time to respond,

I really appreciate it.



My problem is, we paid for a report to evaluate some board failures,

and I'm having trouble evaluating the report!

Most of it is related to chemistry, (I won't bore everybody with that),

but the failures are result of shorts and delamination,



I'll only ask two more questions



Does this picture indicate the following?

"no visible short is present.

This indicates a fiber-thin short

not able to be imaged by X-ray".



That seems like quite a stretch, with no evidence

(and isn't delamination more often a moisture issue?)



http://www.frontdoor.biz/PCBportal/bubbles1.jpg



and part of the report talks about contamination.



http://www.frontdoor.biz/PCBportal/bubbles2.jpg

http://www.frontdoor.biz/PCBportal/bubbles3.jpg



and part of the report suggests the laminate is too thin.


Is 3.5mils too thin?
Aren't there 2.5mil laminates out there now? Or less?


Maybe its not appropriate to talk about other company's
work in public,

If so, don't answer and I apologize for filling mailboxes

onward thru the fog,
Jack


On 10/1/07, Jack Olson <[log in to unmask]> wrote:
>
> I'm not accustomed to looking at reliability issues,
> (my designs are usually so perfect... (grin))
> so every time I see an X-Ray or a cross-section
> I get nervous wondering what I'm actually seeing.
>
> Can anyone explain what the following picture means?
>
> http://www.frontdoor.biz/PCBportal/208what.jpg
>
> onward thru the fog,
> Jack
>

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