well sounds like it's not yet been established whether failure is component, solder assembly or pwb. Questions about financial responsibility are mute at this point. Werner gave good advice/perspective in his comments. dw At 12:48 AM 4/7/2009, Karnwal, Pankaj wrote: >Hi Dwight Mattix > >I am agree with you, :-) > >But first thing comes in my mind that, have the board is not repaired >yet to identify the reason of failure ?? > >We usually do the step analysis : >1. Simulate the reported problem on our test Jig / end product. >2. Reason detection of failure with out disturbing the board by >physically ( Resoldering, tightening of connection ) and electronically >( Reloading the firmware, upgrading ) >3. Once reason is detected/suspected, like failure of component, >soldering issue, we do the repair activity, with preservation of data, >like photo graph of affected area , X-ray images, copy the firmware. >4. If repair activity is done successful, then confirmation of fault is >important by the revert back the situation. >5. One the reason or fault location is confirmed then root cause >analysis of failure is starts... > >If component is defective then it can be send to the component Mfg. to >FA ( Failure analysis ). > >You are seems to be lucky you found a permanent nature of fault, it can >be easily addressed, in case of intermittent failure it becomes 10 times >difficult :-) > >BR >Pankaj Karnwal >Engineer QA > >Barco Electronics System Ltd. >India > >Save Environment for future > > > > >-----Original Message----- >From: Dwight Mattix [mailto:[log in to unmask]] >Sent: Monday, April 06, 2009 7:12 PM >Subject: Re: PCB Failure analysis > >There's always two conversations going on in these matters. Be careful >not to mix them too soon. > >One is technical/scientific. The other is about business/financial >responsibility. Don't start the second conversation prematurely. > >First things first. Answer first question while keeping your technical >hat firmly in place -- before going on to discuss second matter. > >Have you (or the customer) done a failure analysis yet? Have you been >able to isolate on the failure and categorize the failure mode(s)? > >The second matter is more difficult. > >Been there. Done that. Got the tee-shirt. Weekly. :-) > >Good luck. > >At 10:05 PM 4/5/2009, mp3 wrote: > >Hello, > > > >One of our customers have comeback after 3 years asking for a failure > >analysis report on a 10 layer industrial grade PCB. The PCB was > >supplied 3 years back and has been functioning satisfactorilly for the > >last 3 years. Now the customer has 3 PCBs which have failed and is > >insisting it is a PCB related failure. The failure in all the > >3 circuit boards are in the same area around a quadpack IC. We verified > > >the traveller card of the boards processed and found all aspects to be > >compliant. The PCBs were being used in a jig for high reliability > >harness checking. We feel it should be a component related issue rather > > >than a PCB related issue. > > > >Can you give us some inputs on the above which will help us in arriving > > >at the right conclusion. > > > >Rgds > > > >Pradeep > > > >------------------------------- > >Micropack Ltd, Bangalore, India > > > >--------------------------------------------------- > >Technet Mail List provided as a service by IPC using LISTSERV 15.0 To > >unsubscribe, send a message to [log in to unmask] with following text in > >the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt > >or (re-start) delivery of Technet send e-mail to > >[log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing > >per day of all the posts: send e-mail to > >[log in to unmask]: SET Technet Digest > >Search the archives of previous posts at: > >http://listserv.ipc.org/archives Please visit IPC web site > >http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional > >information, or contact Keach Sasamori at [log in to unmask] or > >847-615-7100 ext.2815 > >----------------------------------------------------- > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 15.0 To >unsubscribe, send a message to [log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or >(re-start) delivery of Technet send e-mail to [log in to unmask]: SET >Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the >posts: send e-mail to [log in to unmask]: SET Technet Digest Search the >archives of previous posts at: http://listserv.ipc.org/archives Please >visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for >additional information, or contact Keach Sasamori at [log in to unmask] or >847-615-7100 ext.2815 >----------------------------------------------------- > > >DISCLAIMER: >Unless indicated otherwise, the information contained in this >message is privileged and confidential, and is intended only for the >use of the addressee(s) named above and others who have been >specifically authorized to receive it. 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