Hi Gil - I know when our FA lab is working this type of issue, they can see the difference between the board resin and the cross section potting compound. I do know its a cross section that needs to be prepared carefully as that area can smear if the wrong pressure/grinding/polishing process is not followed. Dave On Thu, Apr 19, 2018 at 7:22 AM, Zilber Gil <[log in to unmask]> wrote: > Thanks Dave, > I will do it. But, I am afraid that during the sample preparation, this > area is contaminated by the resin used for the metalorgic cross-section. Do > you have experience if we can distinguish between the PCB's resin and the > sample resin? > Regards, > Gil > > > > נשלח מסמארטפון ה-Samsung Galaxy שלי. > > > -------- הודעה מקורית -------- > מאת: David Hillman <[log in to unmask]> > תאריך: 19.4.2018 13:56 (GMT+01:00) > אל: TechNet E-Mail Forum <[log in to unmask]>, Zilber Gil <[log in to unmask]> > > נושא: Re: [TN] R: [TN] R: [TN] PCB failure > > Hi Gil - if you have the resources, you should put that cross section in > the SEM and look for possible resin smear on the inner layer/PTH interface. > Resin smear could cause the defect you are seeing. > > Dave Hillman > Rockwell Collins > [log in to unmask] > > > On Thu, Apr 19, 2018 at 4:02 AM, Zilber Gil <[log in to unmask]> wrote: > >> Thanks >> It is a leaded hand soldering of that device. I will check if the other >> failed location has hand soldering also. The material is a high tg material >> (Isola 370 HR). >> Regards, >> Gil >> >> >> >> נשלח מסמארטפון ה-Samsung Galaxy שלי. >> >> >> -------- הודעה מקורית -------- >> מאת: SALA GABRIELE <[log in to unmask]> >> תאריך: 19.4.2018 10:46 (GMT+01:00) >> אל: 'TechNet E-Mail Forum' <[log in to unmask]>, Zilber Gil < >> [log in to unmask]> >> נושא: R: [TN] R: [TN] PCB failure >> >> Gil, >> >> you could show the picture to TNetters by mailing it to Steve Gregory >> [log in to unmask] whom very kindly support us when we need to attach >> picture (many thank Steve for you service) so all the TNetters will see the >> picture. >> >> I have seen your picture, yes it is a IPS (Inner Plane Separation) from >> PTH. >> It may be due to thermal stress in Z assy, but why ? >> You made baking to PCB so it should not be a matter of internal over >> pressure due to moisture blow-off. >> >> Or may be too low Tg of laminate or high CTE in Z assy ? >> Are you running Lead Free Reflow ? >> >> Etc... >> Gabriele >> >> >> -----Messaggio originale----- >> Da: TechNet [mailto:[log in to unmask]] Per conto di Zilber Gil >> Inviato: giovedì 19 aprile 2018 10:27 >> A: [log in to unmask] >> Oggetto: Re: [TN] R: [TN] PCB failure >> >> Thanks Gariele, >> The PCB is new, and it was baked before assembly. >> Thanks, >> Gil >> >> >> >> נשלח מסמארטפון ה-Samsung Galaxy שלי. >> >> >> -------- הודעה מקורית -------- >> מאת: SALA GABRIELE <[log in to unmask]> >> תאריך: 19.4.2018 10:07 (GMT+01:00) >> אל: [log in to unmask] >> נושא: [TN] R: [TN] PCB failure >> >> Hi Gil, >> >> did you handled correctly PCB against moisture absorption ? Like guide >> lines of IPC-1601A ? >> Shelf life of your PCB ? >> Any Baking before reflow? >> >> Gabriele >> >> PS: no picture is attached >> >> -----Messaggio originale----- >> Da: TechNet [mailto:[log in to unmask]] Per conto di Gil ZIlber >> Inviato: giovedì 19 aprile 2018 09:27 >> A: [log in to unmask] >> Oggetto: [TN] PCB failure >> >> Hello Tech, >> We encounter a PCB discontinuing. Cross section shows conductor >> separation from TH. >> The PCB manufacturer claims it is due to overheating during assembly. To >> me, it looks like bad PCB manufacturing. >> Please look at the picture and give me your feedback. >> Thank you >> >> >> --- >> Questa e-mail è stata controllata per individuare virus con Avast >> antivirus. >> https://www.avast.com/antivirus >> The information contained in this communication is proprietary to Israel >> Aerospace Industries Ltd. and/or third parties, may contain confidential or >> privileged information, and is intended only for the use of the intended >> addressee thereof. If you are not the intended addressee, please be aware >> that any use, disclosure, distribution and/or copying of this communication >> is strictly prohibited. If you receive this communication in error, please >> notify the sender immediately and delete it from your computer. >> >> >> The information contained in this communication is proprietary to Israel >> Aerospace Industries Ltd. and/or third parties, may contain confidential or >> privileged information, and is intended only for the use of the intended >> addressee thereof. If you are not the intended addressee, please be aware >> that any use, disclosure, distribution and/or copying of this communication >> is strictly prohibited. If you receive this communication in error, please >> notify the sender immediately and delete it from your computer. >> >> > The information contained in this communication is proprietary to Israel > Aerospace Industries Ltd. and/or third parties, may contain confidential or > privileged information, and is intended only for the use of the intended > addressee thereof. 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