Thanks for your thoughts. I would have liked to do the cross section as
well, but haven't received permission to destroy the PWB (yet).
Hopefully that will be coming. The center balls in the array looked
normal nice pumpkin shapes with good wetting. The board was
intermittent and would operate when someone pressed on the heatsink over
this component, so a possible broken ball was my first thought.
I will take a look at IPC-7095 as Richard suggested.
mark
Mark Woolley |PTRL Laboratory | Avaya | 1300 West 120th Ave |
Westminster, CO 80234 USA |
Voice (Lab): (303) 538-2166 | email: [log in to unmask] |
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of vladimir Igoshev
Sent: Wednesday, April 27, 2011 12:49 PM
To: [log in to unmask]
Subject: Re: [TN] BGA Ball Tilt
Hi Mark,
Steve is absolutely right. I'd suggest to section the component so you
can get a much better idea on whether there a problem or not.
You can contact me off line if you don't have capabilities to do it.
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: Steve Gregory <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Wed, 27 Apr 2011 14:33:22
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
Steve Gregory <[log in to unmask]>
Subject: Re: [TN] BGA Ball Tilt
Hi Mark,
I have your pictures up on my web page:
http://stevezeva.homestead.com/corner_1_45_degrees.jpg
http://stevezeva.homestead.com/corner_2_135_degrees.jpg
and in looking at your images, I don't know that I see a real problem
there.
The ball shape may not be perfectly symmetrical, but I see the same sort
of
shape in the other two balls in each image.
Maybe others can look at these images and say if there's anything to be
too
concerned about...
Steve
-----Original Message-----
From: Woolley, Mark D. (Mark) [mailto:[log in to unmask]]
Sent: Wednesday, April 27, 2011 12:51 PM
To: Steve Gregory
Subject: RE: [TN] BGA Ball Tilt
Steve,
The X-ray images are taken 60degrees to the beam direction. The
magnification is geometric not mathematical. These are same side
corners
(not opposite corners).
Thanks,
mark
mark
Mark Woolley |PTRL Laboratory | Avaya | 1300 West 120th Ave |
Westminster,
CO 80234 USA | Voice (Lab): (303) 538-2166 | email: [log in to unmask]
|
-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Wednesday, April 27, 2011 10:03 AM
To: 'TechNet E-Mail Forum'; Woolley, Mark D. (Mark)
Subject: RE: [TN] BGA Ball Tilt
Do you have any pictures Mark?
Steve Gregory
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Woolley, Mark D.
(Mark)
Sent: Wednesday, April 27, 2011 11:56 AM
To: [log in to unmask]
Subject: [TN] BGA Ball Tilt
I am experiencing a BGA condition I have never encountered before. A
large
>900 pin BGA has corner pins that are not perpendiculat to the PWB
surface.
They are slightly angled toward the center of the BGA. This is seen on
all
four corners. Obviously, this condition is not preferred. Is there a
specification that states the condition of the ball?
Thanks,
mark
mark
Mark Woolley |PTRL Laboratory | Avaya | 1300 West 120th Ave |
Westminster,
CO 80234 USA |
Voice (Lab): (303) 538-2166 | email: [log in to unmask] |
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