If I'm seeing this correctly, isn't there a crack in the laminate at the hole entrance, or is it staining? Also, is that the contact side for the soldering iron?
-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Stadem, Richard D
Sent: 19 April 2018 14:37
To: [log in to unmask]
Subject: Re: [TN] R: [TN] R: [TN] PCB failure
Initially, this does NOT appear to be from Z-axis expansion, but rather resin recession. However, that could have been caused by overheating during soldering or rework also.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, April 19, 2018 8:32 AM
To: [log in to unmask]
Subject: Re: [TN] R: [TN] R: [TN] PCB failure
Hi Gil,
Just got into work and I have your image posted:
http://stevezeva.homestead.com/SmartSelect_20180419-091742_Gaaiho_PDF.jpg
Steve
On Thu, Apr 19, 2018 at 6:29 AM, Zilber Gil <[log in to unmask]> wrote:
> I sent it to Steve.
> I am also attaching it to this mail, so you can look at it.
> Thanks,
> Gil
>
>
>
> נשלח מסמארטפון ה-Samsung Galaxy שלי.
>
>
> -------- הודעה מקורית --------
> מאת: [log in to unmask]
> תאריך: 19.4.2018 14:24 (GMT+01:00)
> אל: [log in to unmask]
> נושא: Re: [TN] R: [TN] R: [TN] PCB failure
>
> Dell - Internal Use - Confidential
>
> Was the photo uploaded to Steve Geogory. I was not able to open the
> drive google url link. Curious to the photo of IPsep.
>
> Victor,
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of David Hillman
> Sent: Thursday, April 19, 2018 6:57 AM
> To: [log in to unmask]
> Subject: 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
> >
> >
> > ---
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