Dear Selva,
There are several possibilities,
Likeness is, provided everything was done properly up to the assembly
point, that you have (in the order I would put it):
- Solder bridge somewhere on the board
- Dendrites growth
- CAF (Conductive Anodic Filaments) knowing you have 24V & 5V this is a
strong possibility as well.
- Component defect
- Functional error (Engineering)
- Short that has been created from the High Temp incursion (Barrel to
innerlayer,...)
But also, as in many cases, the CAD data and CAM data are not matching, as
PCB manufacturers have a tendency to solve issues without informing the
customer. Many CAD data are not clean enough for the PCB Manufacturer,
therefore, often it is cleaned up at the CAM level and errors can be
generated.
The IPC-A-356 suppose to be supplied from the CAD to the PCB Manufacturer
who suppose to use it for generating its Electrical Test.
Was it supplied?
...
Meilleures salutations
Very Best Regards
Rol@nd
www.PCBspecialist.com
Roland Jaquet
14 Champ Budin
1258 Perly, GENEVA
Switzerland
Tel +41-22-880-0405
Mobile +41-79-203-3723
There are three constants in life...
Change, Choice and Principles.
Stephen R. Covey
The straight road to pleasure is all curves and bends
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Selva Suganthi
Sent: Tuesday, July 25, 2006 11:46 AM
To: [log in to unmask]
Subject: [TN] BBT passed , after assembly getting shorted !
Dear All,
I have a board with BBT passed , but after assembly 24v and 5 v are
getting shorted , what could be the reason .
this board is out of 6000 good boards!.
Thanks and Regards
Suganthi
---------------------------------------------------
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
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
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 847-615-7100 ext.2815
-----------------------------------------------------
|
