Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Solder Shorts Under SMT Resistors/Capacitors

Christopher Cross

#9453

Solder Shorts Under SMT Resistors/Capacitors | 21 September, 1999

We are finding solder shorts under 1206 Components on the bottom side of our boards.In all cases these shorts are from either side of the component to a feed-thru under the component body. Adhesive is used to glue down the component and then the boards are wave soldered. The adhesive does cover the feed-thru and is cured so I am at a loss as to how exactly this is happening. Any insight or solutions would be appreciated.

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#9454

Re: Solder Shorts Under SMT Resistors/Capacitors | 22 September, 1999

| We are finding solder shorts under 1206 Components on the bottom side of our boards.In all cases these shorts are from either side of the component to a feed-thru under the component body. Adhesive is used to glue down the component and then the boards are wave soldered. The adhesive does cover the feed-thru and is cured so I am at a loss as to how exactly this is happening. Any insight or solutions would be appreciated. | Chris: Ya got me!!! Some questions:

1 What makes you so sure the glue is preventing the wave solder from getting to the via? 2 What's between the via and the solder mask? I assume there's solder mask. Yea, what kind?? Is the via plugged? Yea, with what? 3 So, what's the extent of this problem? 4 Hey, why don't you get the connection sectioned to get a better idea of how the solder connection to the via is being made?

Good luck

Dave F

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