Would you mind attaching some photos about the holes?





Best Regards,



James Liu 刘春光

Director, Technology & Standardization 技术与标准总监

IPC China

上海市长宁区延安西路1088号2303室

Suite 2303，#1088 West Yan'an Rd., Changning, Shanghai 200052 PRC

Tel:   +86 21 5497 3435

Fax:  +86 21 5497 3437

MP:   +86 136 0133 3491

[log in to unmask]<mailto:[log in to unmask]>

www.ipc.org.cn<http://www.ipc.org.cn>

________________________________

发件人: TGAsia [[log in to unmask]] 代表 Patricia Lui [[log in to unmask]]

发送时间: 2009年8月21日 19:50

收件人: Listserv TGAsia

主题: [TGAsia] Holes Desmear Issue



Dear Friends,



Currently I am facing the following issue which I hope to have your expertise advise:



Issue:

I have boards rejected and found that the 1.2mm holes of some of the boards have desmear and we have confirmed that it was caused by the 1.2mm drill bit blunt at the tip area. Only 6% of the boards are affected.



The boards have all passed 1) Etest in my factory  2) 48hrs functional test.

But it have failed after 3 to 6 months on the field due to desmear in different location of the 1.2mm holes. Currently customer is rejecting 100% of the boards because they have no confident to use the boards.



I hope to have your expertise on what other test (non-distructive) I can conduct to be able to 100% pick up this type of issue boards which had passed the functional test. Baring in mind that 1) the boards are already assembled with components, 2) the boards have passed the standard test listed above. 3) The boards can fail after 3 to 6 months running.



Hope to have your expertise advise. Thanks



Best Regards

Patricia Lui

Xuan Technologies

Tel: 65-97227602















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