Several years ago, I had one of Steve's machines. Very nice; 5-axis control for viewing at angle, but as he said, opens were very difficult to detect.
I used it mainly to establish, validate, and audit my process.
Regards,
Rick Todd
Staff Engineer
678.925.4786
Sent from my BlackBerry
----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Wed Oct 07 09:29:47 2009
Subject: Re: [TN] BGA X-Ray Defect Detection Capabilities
Hi Pete,
I just happen to notice your post. As an x-ray manufacturer that supplies both top down and
angle viewing machines, I can tell you most opens are hard to detect with either.
You always hope to see a variation in grey scale on the x-ray image due to different density,
but this isn't always the case.
If you have a microcrack, a ball just sitting on a pad, a separate of the pad from the pc board,
the density will not have enough variation. Unfortunately, this is the majority of opens.
I have an ERSASCOPE and a BGA-100 from SMT Tools in our lab. I use it when I notice
an unusual ball shape on the x-ray image. It's a good way to confirm the results.
The BGA-100 might be a good choice for you. It's a handheld system that lets you do
a quick inspection. The price is around $ 3,000. We bought one for under $ 1,000.
You can ask them if they have specials. I hope this helps.
Steve
________________________________________
From: TechNet [[log in to unmask]] On Behalf Of Pete Houwen [[log in to unmask]]
Sent: Wednesday, October 07, 2009 9:03 AM
To: [log in to unmask]
Subject: Re: [TN] BGA X-Ray Defect Detection Capabilities
It never ceases to amaze me how topical these - um - topics - are. I just
sent a box of boards out last nught to an x-ray shop. (same boards I asked
about earlier, this time with lead free BGAs). We're getting strange results and
assumed there's opens in the BGA. I don't have a lot of confidence that the
used a hot enough profile for a big board with many copper planes, so I'm
expecting some non-wetting.
Can I assume from this thread that they very well might give these boards a
passing grade, yet we could still have opens? The lab says they can do angle
x-rays, we turned down another shop that said they do top-down only.
One of the suspected opens is in row 2. What about a BGA scope for that
one?
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