Allright, will send the fishbone to Joe offline once more.
It was a BIG fish.
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: den 18 juni 2007 23:41
To: [log in to unmask]
Subject: Re: [TN] Failure statistics breakdown data?
I think you are going to get a decent definition now. I thought the
fishbone chart was sent by Hfjord. No reflection on his capabilities but
it was a mirrored image so everything came out Bass-ackwords.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David Tremmel
Sent: Monday, June 18, 2007 2:24 PM
To: [log in to unmask]
Subject: Re: [TN] Failure statistics breakdown data?
Hello,
I remember about 2 years ago someone had a fishbone chart of what you
are looking for and I think Bev Christain posted a link to it. Have you
tried contacting her off-line?
David
-----Mensaje original-----
De: TechNet [mailto:[log in to unmask]] En nombre de Joe Fjelstad Enviado
el: Monday, June 18, 2007 4:07 PM
Para: [log in to unmask]
Asunto: Re: [TN] Failure statistics breakdown data?
Thanks for your comments, Guy
I received a few responses off line and it sounds like there exists no
commonly collected and shared data base and that it is every company for
itself on this matter.
As one colleague responded, "the question is an 800 pound gorilla in the
room" that is being ignored (perhaps in the hopes that it is a mirage?)
I suspect that no one wants to admit that their products are anything
short of
perfect. Who would?
Your opening clarification question was a good one but I was thinking
only of initial turn on as I figured that was the easiest to collect and
store.
BTW, I think that the IPod may have been a bit of planned obsolesce. I
have
a major brand name electric shaver with simple rechargeable AA
batteries that recently found were welded in place. They obviously (or
at least
apparently)
intended for it to be either pitched or returned for the repairs at a
handsome margin. Certainly can't trust the consumer to change AAs.
Joe
In a message dated 6/18/2007 10:28:11 AM Pacific Daylight Time,
[log in to unmask] writes:
Are you talking field return or OEM in factory initial turn on.
If you are talking in-factory initial turn-on, typical device, solder
Defects number 1. Mostly opens because shorts are easy to detect with
inspection and ICT. Though in my experience there special events on the
factory floor that can change all that.
If you are talking field returns, we have another story. And must
include, electronic design problems, mechanical design problems and
customer abuse or misuse.
I kept this kind of data at an Organ Company for years. The data set
ran from 1986 to 2000. We stored the information on a VAX 8300. I left
in May of 2000. I doubt they continued to collect and analyze the data
as that machine was expensive to maintain and in a DataTrieve database,
not easy to port over to Windows.
I can tell you this. During that time there were periods when field
failures were primarily design related, others when failures were
primarily board fab. related, periods when failures were primarily
component related (sometimes semi-conductor other times passives) and
other periods where failures were primarily related to manufacturing
problems. All of these would be embarrassing for some interested party
because they were attributable to some special cause of failure and we
were able to identify that special cause.
There were very few periods in which the population of defects would
not have been influenced by one of these assignable causes. So, even
this huge data set would not tell you want the most common "common
cause" defect would be. My gut tells me it would be customer misuse
followed by, in the case of Allen Organ, electrical or mechanical
design problem.
Other companies might have more design problems than misuse problems.
BTW
these merge. You can have a design problem that customers attempt to
fix, which turns into a misuse problem . . . . Ever tried to change a
battery in an iPod? Is an unsuccessful attempt a design problem or
customer misuse?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
Sent: Monday, June 18, 2007 10:59 AM
To: [log in to unmask]
Subject: [TN] Failure statistics breakdown data?
Good (time of day here) colleagues,
Does anyone know of a statistical base that identifies assembly
failures and traces them to causes with some sort of breakdown?
That is failures traced to assembly only (e.g., opens, shorts,
insufficient cleaning, etc.), failures related to PCB manufacturing
only (e.g., PTH failure, opens, shorts, CAF, etc.) and failures traced
to the components themselves of any cause (ESD, overheating, thermal
cycling failure, etc.).
I realize that this may be a sensitive topic for some folks and am thus
open to taking any such data off line.
However any perspective based on experience and "guessimates" from the
general audience is encouraged and most welcomed to see if there is any
kind of consensus of experience and how close it matches with the the
industry's
general perceptions.
Rough (in the same city at the ball park) estimates are OK.
Thanks in advance for any form of light that can be shed while I
fumble around in the dark feeling for the "main lightswitch". ;-)
Best to all,
Joe
************************************** See what's free at
http://www.aol.com.
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