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July 2010

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Subject:
FW: Failing leds due to conformal coating?
From:
Lon Weffers <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Thu, 15 Jul 2010 16:09:00 +0200
Content-Type:
text/plain
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text/plain (49 lines) 
Hi,

For one of our customers we produced a board containing green smt leds on a lead-free process.
The production took place last December.
Our customer has tested the boards on its functionality twice; before and after conformal coating.
No errors were reported. (also december)
Since a week, several leds seem to be defect. While testing, several leds don't lighten, if you push a little bit it lightens.
The soldering is oke.

My question is: can the led fail due to a conformal coating? And can it appear after 3 or more months? Has someone experienced the same problems?

Regards,

Lon Weffers
Matas Electronics bv


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