You might try some type impedance, or resistance testing but this may only
muddle the stew more...if you've got that condition present, my thoughts are
suspect the entire lot and handle appropriately.

You could I suppose apply enough current (typical os use plus some) to the
circuit and see what happens, but then you may only induce the failure
(then, or a short period later, while in use again).

I'd say, take a big breath, gulp the Mylanta...recall the units (within that
specific lot)...and replace them...

Franklin


----- Original Message -----
From: "Eric Stellrecht" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, December 15, 2003 8:10 AM
Subject: [TN] Problem With PCB Opens


> Technet Members,
>      We have identified a field return trend in a line of circuit boards.
The problem is occurs which a trace separates from the plated through hole
> causing an open circuit.  Unfortunatly, we had to destructively analyze
two boards to reach this solution.  The failure analysis points to a
> manufacturing defect that will potentially affect an entire lot of boards.
We are looking for a non-destructive way to analyze this lot of boards to
> determine whether or not a particular board suffers from a partially or
intermittant open condition, on its way to becoming a hard open.  Any
> recommendations would be greatly appreciated.  Thanks in advance...
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
> -----------------------------------------------------
>
>

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------