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How would one rework an assembly with micro BGA voiding due to several micro vias on pad?

 

Rgds,

Peter

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brooks,Bill
Sent: November 19, 2001 8:48 AM
To: [log in to unmask]
Subject: Re: [TN] AW: [TN] BGA voids

 

We used to make PCB's back in the mid 1970's and used a fusing oil produced by Shell Oil in our Hydro-squeegee. I want to say it was some sort of Peanut oil... but I can't remember for sure... Those were my High School years... :)

Good luck... - Bill Brooks

-----Original Message-----
From: David Fish [mailto:[log in to unmask]]
Sent: Monday, November 19, 2001 11:27 AM
To: [log in to unmask]
Subject: Re: [TN] AW: [TN] BGA voids

Who are suppliers of inspection quality oils [Canadian Balson??] the bear the heat of soldering well?

----- Original Message -----

From: [log in to unmask]">Bob Willis

Sent: Monday, November 19, 2001 4:45 AM

Subject: Re: [TN] AW: [TN] BGA voids

 

The outgassin test for blowhole in printed boards was developed in the years gone bye after it appeared in and Italian PCB specification I was asked to review. After some testing I did it ended up in the IEC specification.

 

The same oil can be used effectivly for outgassing tests with via in pad. In the last test I did with ten scrap boards dfrom different suppliers 2 outgassed on the pads from the vias.

 

The procedure for through hole which could and has been applied to vias is on my web site which is in the download section.

 

Hope this helps.

 

 

Bob Willis
Electronic Presentation Services
2 Fourth Ave, Chelmsford, Essex, CM1 4HA England

 

 

www.bobwillis.co.uk
Tel: (44) 01245 351502 Fax: (44) 01245 496123

 

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