Jason I sent you some info you can discuss with ypour supplier but also mind the remaks about via pugging vs open vias, this is a design issue. If the source of the solderballs is vias (usually the case for large balls) then via plugging is required to prevent this. Regards, C.B. Katzko VP, Research + Development TTM Meadville Asia Pacific Email [log in to unmask] Mobile +86 13817362590 Tel +86 21 37747528 Fax +86 21 37747590 ----- Original Message ----- From: Justin Wu [[log in to unmask]] Sent: 04/13/2011 03:59 PM ZE8 To: <[log in to unmask]> Subject: Re: [TGAsia] Solder Ball Hi Alvin, We are kept the PCB in original seal packaging and normal storage condition till put to use (Remark: We received the PCB on last month) and that this problem was found before our SMT. Thanks and best regards, Justin Wu Utilux South China Ltd Phone: +86-755-2850 7521 Fax: +86-755-2850 0927 E-mail Address: [log in to unmask] _____ From: Alvin Ling [mailto:[log in to unmask]] Sent: Wednesday, April 13, 2011 3:46 PM To: Justin Wu; [log in to unmask] Subject: Re: [TGAsia] Solder Ball Justin , If the materials and dimension are fulfill the requirements how can you made the judgment are related to the supplier caused the incident of solder ball .It may be related the storage environment ( moisture in the PCB ). Alvin ----- Original Message --- From: Justin Wu <mailto:[log in to unmask]> To: 'Alvin Ling' <mailto:[log in to unmask]> ; [log in to unmask] Sent: Wednesday, April 13, 2011 3:39 PM Subject: RE: [TGAsia] Solder Ball Hi Alvin, Yes, the PCB layout was designed by our Engineering Team. I would like to know why I can't claim the PCB manufacturer. Any input? Thanks and best regards, Justin Wu Utilux South China Ltd Phone: +86-755-2850 7521 Fax: +86-755-2850 0927 E-mail Address: [log in to unmask] _____ From: TGAsia [mailto:[log in to unmask]] On Behalf Of Alvin Ling Sent: Wednesday, April 13, 2011 3:31 PM To: [log in to unmask] Subject: Re: [TGAsia] Solder Ball Justin , I have the quaestion who design the PCB layout from your engineering team or by PCB supplier . If the design from your team how you can claim the supplier ? Alvin ----- Original Message ----- From: Justin Wu <mailto:[log in to unmask]> To: [log in to unmask] Sent: Wednesday, April 13, 2011 3:18 PM Subject: Re: [TGAsia] Solder Ball Thanks Mr. Zhao. Yes, we have claimed to PCB manufacturer accordingly. Thanks and best regards, Justin Wu Utilux South China Ltd Phone: +86-755-2850 7521 Fax: +86-755-2850 0927 E-mail Address: [log in to unmask] _____ From: TGAsia [mailto:[log in to unmask]] On Behalf Of WM-FQA-Zhao ZiDe Sent: Wednesday, April 13, 2011 2:59 PM To: [log in to unmask] Subject: Re: [TGAsia] Solder Ball Dear Justin Wu: From the photo, we can find the solder ball on topside PTH, due to solder mask in the PTH and caused the hot air chould not through the TH at the HASL process, if void the same question reoccur, the solder mask film need be revised. you can let the PCB manfuacture plant to enlarge the solder mask opening or plug the TH by solder mask. Many Thanks, Best Regards, Zhao Zi De QA Department World Mastery Technology Limited Tel:+86 769 85569149 Ext:862 Fax:+86 769 85262272 Email:[log in to unmask] ----- Original Message ----- From: Justin Wu <mailto:[log in to unmask]> To: [log in to unmask] Sent: Wednesday, April 13, 2011 12:08 PM Subject: Re: [TGAsia] Solder Ball Hi All, We have found some solder balls inside TH on the PCB (See below photo), however there is no exact matching of the defect mentioned in IPC, but according to IPC-A-610 Clause 5.2.7.1, the solder ball is accepted if it is embedded in the solder resist. So, would you please share your experience in such case with me? Thanks in advance! Best regards, Justin Wu Utilux South China Ltd Phone: +86-755-2850 7521 Fax: +86-755-2850 0927 E-mail Address: [log in to unmask] __________ Information from ESET NOD32 Antivirus, version of virus signature database 6037 (20110412) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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