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Date: | Tue, 24 May 2005 16:28:08 -0400 |
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Al -
Surface finish is immersion silver? By any chance is this also a lead
free assembly?
Bruce Tostevin
Benchmark Electronics
Hudson, NH
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Al Onderick
Sent: Tuesday, May 24, 2005 3:44 PM
To: [log in to unmask]
Subject: [TN] Solder Joint Anomaly
Dear Technetters,
I now have a couple of cross sections to go along with my
xrays.
Does anyone have an idea what might cause this type of anomaly?
http://www.texas-gold.org/PCB/pages/xray/index.htm
Is this a problem or just a strange looking void ?
The board supplier is going to run the following tests
* Cross section the 15 pin connector area for optical
microscopy and analysis.
* Scanning Electron Microscopy (SEM) analysis of
solder
filled and bare silver hole wall surfaces
o SEM will identify particulate or other 3-dimensional
bodies to be analyzed with EDS.
* Energy Dispersive Spectometry (EDS) analysis of
solder filled and bare silver hole wall surfaces
o EDS will identify the all elements relative to the
point of failure to identify possible contributors as the root cause.
* X-Ray Fluorescence of bare silver hole wall
surfaces
o XRF will determine the thickness of the solder
deposit
in the hole walls in the 15 pin connector area.
-Al
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