Guenter,
A picture would help a lot.
Vladimir
SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: "Grossmann, Guenter" <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Wed, 27 Oct 2010 14:50:41
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
"Grossmann, Guenter" <[log in to unmask]>
Subject: [TN] AW: [TN] Cracks in BGA solderjoints
Dear Colleagues
Thanks a lo for the first answers.
- No, the BGAs have not been reworked
- Most failures occur in the field, some are found after production
- We didn't find any separations after only printing solderpaste and soldering.
- It's not only the corner balls, the defects are found statistically in the array
Günter
>-----Ursprüngliche Nachricht-----
>Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Joyce Koo
>Gesendet: Mittwoch, 27. Oktober 2010 13:26
>An: [log in to unmask]
>Betreff: Re: [TN] Cracks in BGA solderjoints
>
>Spalling of the IMC? Are those reworked?
>--------------------------
>Sent using BlackBerry
>
>
>----- Original Message -----
>From: Inge [mailto:[log in to unmask]]
>Sent: Wednesday, October 27, 2010 07:17 AM
>To: [log in to unmask] <[log in to unmask]>
>Subject: Re: [TN] Cracks in BGA solderjoints
>
>I think it's not cracks in the BGA, but snacks in the BGA. At least what
>I
>found once
>/Inge
>
>
>----- Original Message -----
>From: "Grossmann, Guenter" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Wednesday, October 27, 2010 9:36 AM
>Subject: [TN] Cracks in BGA solderjoints
>
>
>Hi Technetters
>
>I have an effect in BGA solder joints that I have never seen before.
>In microsections and in FIB preparations I see cracks between the IMC
>and a
>slightly darker region towards the Ni which I assume to be a P enriched
>zone
>of the Ni. However, the cracks are somewhere in the width of the solder
>joint and they are quite short running out to a row of pores that look
>somehow like Kirkendall voids.
>Is there still a possibility to place one or two pictures? Kim's IPC
>site
>doesn't work.
>
>Best regards
>
>Günter
>
>
>
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