Please post your stackup details and material type(s)
Sent from my Verizon Wireless 4G LTE smartphone
-------- Original message --------
From: Pete <[log in to unmask]>
Date: 10/01/2013 8:35 AM (GMT-06:00)
To: [log in to unmask]
Subject: [DC] Delamination - how often?
How often do you experience delamination?
I'm having a problem explaining this to my management, and coming up with a plan to move forward.
We built about 30 boards, proto, quick turn. We ended up with some major delamination, enough failures and intermittent errors that we scrapped the lot. Cost us about $10K plus a few man weeks. But it's a critical project, management is not happy. The "it happens" that I've told them, the CM told them, isn't enough (no kidding) So I have to give them some way forward that inspires confidence.
Some background: I'm very particular about vendors, we have a rigorous certification process. I have had only 2 of these type errors in over 20 years. We purchased boards from our fab vendor, delivered them to a high quality CM for assembly. Boards are RF, with uneven copper and thin laminates, so little margin for error. Boards showed up assembled with about 5 of them showing lots of delam. We've done a week of investigation, with no resolution. Solder samples, run 2x, showed no risk. Follow up T260 testing on the same fab lot, 3x, no delam. Chemistry and Physics conspired against us on this one.
Management is looking for a way to shift liability in the future, their ideas are going to cost us time and money on each build. So here's my questions:
How often do you see delam?
If your CMs buy boards, do they accept total financial responsibility if assemblies are delaminated?
If not, what do you do to protect yourself from financial loss when boards go bad?
2 failures in 20+ years is a pretty good track record, I don't want to change our way of doing things. But right now, my boss wants a plan for either no errors, or a way to shift liability.
Pete
---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 16.0.
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 16.0.
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------
|
