Fellow Techs

 

We purchased a GPD automated epoxy dispenser and I want to proof out the
new automated underfill application process on BGAs. We use a wickable
Loctite underfill that requires an elevated temperature to flow properly
under BGAs, etc..  Currently we successfully underfill by hand and want
to switch to an automated process using the GPD.  

 

I want to verify the underfill coverage under BGAs using a
non-destructive test method. The only non-destructive method I am aware
of is acoustic imaging using an instrument such as Sonoscan, which I
believe will show voids in the underfill material. I do not know how
industry non-destructively verifies underfill coverage.  I plan on
physically removing some BGAs on scrap boards to verify coverage but do
not want to do this on good boards for obvious reasons.

 

Question - What is the commonly accepted non-destructive method for
verifying BGA underfill coverage?  Look forward to your comment. thanks

 

Best Regards,

- Joe

 


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