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PCB Assembly Service

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In assembly the bare board is populated with electronic components, called a "printed circuit board assembly" (PCBA). In through-hole technology, the component leads are inserted in holes surrounded by conductive pads; In surface-mount technology (SMT), the component is placed on the PCB so that the pins line up with the conductive pads or lands on the surfaces of the PCB.

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White residue problem
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Hi all I just got feedback from my customer about "White residue problem" around solder joints with manaul soldered connector at customer site and included the failure analysis report that there is residues of Cl,S,Na . I 'd like to know, the white residue/comtammination come from? and Are they(white residue and Cl,S,Na) rejected under IPC standard?
Thank you and best regard.
Statement: This post is only the personal view of the author and does not represent the opinions of

Andreas Jonsson

I must say you have very interesting posts here.

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