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I was replying to Vladimir's suggestion that you might be looking at
PTHs - just a quick way to check without having to get an unpopulated
board or look at the gerber.  


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Monday, July 21, 2008 1:56 PM
To: [log in to unmask]
Subject: Re: [TN] Solder balls

The solder balls are near the arrows.  Faint grey round objects.
This device does have a heat slug, and there are plated thru holes under
it for heat transfer.

And yes, our X-ray does allow oblique viewing.  What are you suggesting
we look for?  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Sewell
Sent: July 21, 2008 12:53 PM
To: [log in to unmask]
Subject: Re: [TN] Solder balls

Genny,

Does your new X-Ray allow for oblique viewing?  Your solderballs will
stay round - vias will appear as columns.  If not you can always prop up
the board on one side but magnification/focus will change and the image
won't be as "pretty".

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Igoshev, Vladimir
Sent: Monday, July 21, 2008 1:21 PM
To: [log in to unmask]
Subject: Re: [TN] Solder balls

Hi Genny,

Here is a dummy question: Why are you talking about QFN and solder
balls? I guess what you see are kind of PTH for heat transfer, but not
solder balls.

Vladimir

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, July 21, 2008 1:54 PM
To: [log in to unmask]
Subject: Re: [TN] Solder balls

Hi Genny!

Sorry it's taken me a bit to get your picture posted, but I just got
back from 2-weeks vacation and a week in Colorado going to a
IPC-771/7721 instructor certification class, so I've been catching up on
things this morning. But here is your picture:

http://stevezeva.homestead.com/files/solderballs-QFN.jpg

Myself, I wouldn't worry about them tiny solderballs. They probably
aren't going anywhere, and besides if they did, they're so small what
problem could it cause?

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Monday, July 21, 2008 10:52 AM
To: [log in to unmask]
Subject: [TN] Solder balls

Have you ever gotten a much better analytical tool available to you, and
have it cause major panic due to what you can see now that you never saw
before?
We got a major fancy dancy brand new X-Ray.
Now we see things like the attached picture.  Steve, could I trouble you
to post it for me?  
 <<solderballs-QFN.jpg>>
Our old X-Ray would have never seen this.
Would you fail these solder balls?

It is a QFN, 0.5mm pitch, 0.3mm pad width with a heat slug.
I think trying to replace this device by hand would cause more trouble
than we see right now.

Genny 

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