Paul, yes.

Joyce, your explanation makes sense...is it common knowledge?  Published?

Chris

From: Paul Edwards [mailto:[log in to unmask]]
Sent: Monday, October 11, 2010 1:43 PM
To: TechNet E-Mail Forum; Chris Mahanna
Subject: RE: Mech. damage or poor wetting?

ENIG surface finish on PCB?

Paul

Paul Edwards
Surface Art Engineering

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Monday, October 11, 2010 9:29 AM
To: [log in to unmask]
Subject: [TN] Mech. damage or poor wetting?

We have a BGA dye-n-pry job that shows board side sj damage with a strong correlation to fan-out clocking.
We also have some microsection evidence of poor wetting.
All damage/dye is on perimeters.

Is this an indication of heat sinking and subpar wetting, or can it be completely mechanical?  Both?

Thanks

Chris

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