Jack,
What have you done to that board? The overview photo (with the label arrows)
shows a board that looks really bad. At least for me. Has it been exposed
to a lot of environmental tests? Or do you have a ...erh...a not so good
board supplier. You may have a general quality problem?
I apologize in advance, if I misjudge, photos can sometimes be misleading.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Jack Olson
Skickat: den 2 oktober 2007 18:23
Till: [log in to unmask]
Ämne: Re: [TN] Is This a BAD Thing?
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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