Ga-
Trying to bring this back on track, here. I've looked at your pictures, but I am having trouble deciphering. Sure, I see a crack, but I'm having trouble making out where the crack is. I expected something which looks like a ball, with a crack either straight through it or at the interface with the BGA device or at the interface with the printed circuit board metallization.
16G at 85C sure seems like a very minimal amount of stress. My first guess is that this part was in the middle of a larger board which was going through full plate bending modes. Was the vibration profile random, swept, or fixed frequency?
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert
Sent: Thursday, January 15, 2009 11:26 AM
To: [log in to unmask]
Subject: Re: [TN] NTC RE: [TN] Possible cause on open
Nice thing about Florida winters is we can back off from SPF50 to SPF35 sunblock
Bob
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner engelmaier
Sent: Thursday, January 15, 2009 11:13 AM
To: [log in to unmask]
Subject: Re: [TN] NTC RE: [TN] Possible cause on open
Wet suit is good anyway--avoids the sun burn.
Werner
-----Original Message-----
From: Graham Collins <[log in to unmask]>
To: [log in to unmask]
Sent: Thu, 15 Jan 2009 10:43 am
Subject: Re: [TN] NTC RE: [TN] Possible cause on open
But Werner, you'd have to wear a wet suit, otherwise there would be serious shrinkage issues with just a speedo on! Oh, the horror!
regards,
- Graham
(-17 C here in Halifax)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner engelmaier
Sent: Thursday, January 15, 2009 11:33 AM
To: [log in to unmask]
Subject: Re: [TN] NTC RE: [TN] Possible cause on open
Not so--no problem starting the boat.
werner
-----Original Message-----
From: Ian Hanna <[log in to unmask]>
To: [log in to unmask]
Sent: Thu, 15 Jan 2009 9:59 am
Subject: Re: [TN] NTC RE: [TN] Possible cause on open
The skiing sure must suck...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert
Sent: Thursday, January 15, 2009 9:50 AM
To: [log in to unmask]
Subject: Re: [TN] NTC RE: [TN] Possible cause on open
Whiners! It was all the way down to 39° last night here in Florida.
Bob Croslin
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Thursday, January 15, 2009 9:12 AM
To: [log in to unmask]
Subject: [TN] NTC RE: [TN] Possible cause on open
Beatcha!
-20C with no wind at 6 AM.
It's not called the Gr
eat White North for nothing!
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, January 15, 2009 8:05 AM
To: [log in to unmask]
Subject: Re: [TN] Possible cause on open
Mornin' Everbody!
Well, here in Tulsa, we're just like a lot of other people in the country this morning, trying to stay warm. Right now we're sitting at -10 C. with a wind chill of -15 C. It's supposed to be colder tomorrow...
GA, I have your pictures posted now. They're at:
http://stevezeva.homestead.com/files/Fracture1.jpg
http://stevezeva.homestead.com/files/Fracture2.jpg
Hopefully someone can give you some ideas...
Steve=0
A
________________________________
From: Tan Geok Ang [mailto:[log in to unmask]]
Sent: Wednesday, January 14, 2009 7:27 PM
To: [log in to unmask]; Steve Gregory
Subject: Possible cause on open
Hi Steve,
Please help to download these pictures TechNet, thanks.
Hi All experts,
Testing (combine test of 16G at 85 oC) was performed on evaluation boards with under-filled BGAs. Open issue (cracks) was detected only at some corners of the BGA (35x35mm with 1156 balls) after the test. Lead-free process and PCB with ENIG surface finish. Peak temperature is 248 oC with a 65 sec above
217 oC.
FYI, the service lab has not come out a report.
What are the possible causes? (CET mismatches, Lead-free alloy related, material, pr
ocesses)
Thank you in advance.
Regards
GA Tan
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