Genny...

It looks more like a resistor then a cap because of the lack of side termination density...
That being said I would remove it because you can't guarantee what the value is and that nothing will get under there to form a conductive path to the adjacent ball.

Paul 

Paul Edwards
Process/Quality Engineering
Surface Art Engineering


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Friday, February 11, 2011 9:37 AM
To: [log in to unmask]
Subject: [TN] FW: What would you do?

Please see the link below.
Cap under BGA.  
Inquiring minds question: If the board tested out OK, would you ever
consider just leaving this here? The part is a ceramic cap.


________________________________

From: Steve Gregory [mailto:[log in to unmask]] 
Sent: February 11, 2011 10:37 AM
To: Genny  
 Subject: RE: What would you do?



Hi Genny,

 

I have your picture posted:

 

http://stevezeva.homestead.com/part_under_BGA.jpg

 

It depends. First thing I would want to know, what is this? Is it metal?
If it is, it would be a violation of electrical spacing and I wouldn't
leave it there.

 

Does the ball have any function? Some balls have no function.

What is this board for? A critical application? If it is then no.

How scarce is the BGA?

 

There's a lot of "it depends" that would have to be answered before I
would consider it.

 

My first reaction is that I wouldn't leave it there. But there may be
some circumstances that I might consider it.

 

Steve

 

From: Genny   

 Sent: Friday, February 11, 2011 10:32 AM
To: Steve Gregory
Subject: What would you do?

 

<<part under BGA.jpg>> 

Genny 


______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------


==============================================================================

This email and any attachments thereto may contain private, confidential, and
privileged material for the sole use of the intended recipient. Any review, copying,
or distribution of this email (or any attachments thereto) by others is strictly prohibited.
If you are not the intended recipient, please contact [log in to unmask]
immediately and permanently delete the original and any copies of this email and
any attachments thereto. 

==============================================================================


______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------