Hi Ofer,
'Tis a pity you do not have a lab; however...., I take it you have a desk and
a screwdriver [not too large] and..... I take it you can sacrifice every so
often one of the components so cheaply acquired by your purchasing department
[who runs your company anyway?] together with one of your, I am sure also
cheaply procured, circuit boards, run an assembly test, and pry off [use your
'calibrated' hands with the not-too-large 'calibrated' screwdriver]. The force this
takes is immaterial, what is important is the resulting failure mode(s). If
the separation is interfacial cleanly between the soldering pads and the solder
balls =>REJECT, if the soldering pads a ripped of the PCB [or the compentent]
=>ACCEPT.

Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com

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