Dear Technetters,

I need all possible help to understand SEM analysis done on my board and to
find out possible sources of basic elements.

(1) On solder mask area, there was Silicon (Si), Sulfur (S) - is it due to
LPI solder mask? Also found Oxygen (O) and Carbon (C)- meaning flux residue?

(2) Found Silicon (Si), Chlorine (Cl), Calcium (Ca), Barium (Ba), Oxygen (O)
and Carbon (C) on epoxy and in a kind of void area- is it from flux?

Is there any book that help me solve above mystery?

re,
ken patel


______________________________________________________
Ken Patel                       Phone:  (408) 490-6804
1708 McCarthy Blvd.             Fax:    (408) 490-6859
Milpitas, CA 95035              Beeper: (888) 769-1808

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