Solder Ball 'fell off'

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We have a situation where our customer returned a device (BG... - Apr 13, 2005 by

Whenever we hear "gold" and "balls falling off", we think of... - Apr 18, 2005 by davef

#33697

Solder Ball 'fell off' | 13 April, 2005

We have a situation where our customer returned a device (BGA) with a missing solder ball. The process is Copper-Nickel-Gold-Solderball. EDX revealed that no trace of gold nor solder material (lead-free balls). Could poor Au plating/adhesion cause the ball to completely fall off in an isolated pad? Is there a manual procedure to replicate this?

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davef

#33757

Solder Ball 'fell off' | 18 April, 2005

Whenever we hear "gold" and "balls falling off", we think of black pad [hypercorrosion of nickel]. What does your EDX show?

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