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PCB was swollen after SMD

PCB was swollen after SMD

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Hi all, The PCBA was swollen after SMD It is hard PCBA with ... - Aug 11, 2021 by Danisa

Most likely you have a bad batch of PCBs. This seems like a ... - Aug 12, 2021 by SMTA-64387687 SMTA

Hi, I thought the same. Unfortunately, my boss did not think... - Aug 13, 2021 by Danisa

Agree on a pcb manufacturing defect. Contact the supplier of... - Aug 17, 2021 by kumarb

You've probably got a really bad set of PCBs. ... - Aug 18, 2021 by Paul R. Carter

We have seen a larger amount of boards lately get rejected i... - Sep 09, 2021 by MM

I would switch PCB shops. Unless your oven profile is out of... - Sep 09, 2021 by kumarb

more... if you want to source from the #1 PCB shop in China... - Sep 09, 2021 by kumarb

Your boss didn't think so? What was his/ her theory? Was t... - Sep 09, 2021 by ProcEng1

Forgot to ask earlier - what is the TG rating for your lamin... - Sep 09, 2021 by kumarb

Was this problem solved? What did your boss do to come up wi... - Sep 22, 2021 by Paul R. Carter

Danisa

#86922

PCBA was swollen after SMD | 11 August, 2021

Hi all, The PCBA was swollen after SMD It is hard PCBA with 6 layers and SMD both sides Defect rate: ~ 5% Phenomenon: swell at the same side, same position (at 2 IC positions). Did not find any abnormality in SMD process as well as storage condition. The humidity card is good condition and the storage time is only 2 months. I got some advice that all PCBs with 6 layers must be baked before inputting SMD without care how long storage. SMD 2nd side must be finished within 24 hours after finishing SMD 1st side. These conditions will help to reduce the swell situation. Please kindly advise.

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SMTA-64387687

#86936

PCBA was swollen after SMD | 12 August, 2021

Most likely you have a bad batch of PCBs. This seems like a lamination defect. Most likely, there was some contamination that prevented layers from adhering. You can cut one of the boards at the defect side and inspect the cross-section.

This message was posted via the Electronics Forum @ SMTA SMTA

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Danisa

#86943

PCBA was swollen after SMD | 13 August, 2021

Hi, I thought the same. Unfortunately, my boss did not think so, Thanks a lot

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kumarb

#86951

PCBA was swollen after SMD | 17 August, 2021

Agree on a pcb manufacturing defect. Contact the supplier of the PCBs for guidance. They have to review the issue for a proper resolution. Is it from offshore? Can suggest some solid pcb suppliers in Asia if there is an interest.

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Paul R. Carter

#86956

PCBA was swollen after SMD | 18 August, 2021

You've probably got a really bad set of PCBs.

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#87037

PCBA was swollen after SMD | 9 September, 2021

We have seen a larger amount of boards lately get rejected internally.

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kumarb

#87038

PCBA was swollen after SMD | 9 September, 2021

I would switch PCB shops. Unless your oven profile is out of spec, consider a different PCB supplier.

We have sourced very high volumes of PCBs (4L-6L) from offshore and can recommend a list of quality shops.

Shops that we can recommend are:

Suntak PCB (Shenzhen) - they do not work directly unless you have very high annual volumes so you will need to work through an approved agent.

For the agent contact:

Terry Guan | Sales Department SHENZHEN YAXINDA TECHNOLOGY CO.LTD Factory Address: No.6-3-3, Central Industrial Zone, Central Village, Huicheng District, Huizhou. Tel:+86 13145861850 | Website: http://www.yaxindatech.com| Email: pcb023@yaxindatech.com Can suggest more on demand.

Do you use via-in-pad for your PCB designs? If yes, then other shops must be considered. Can share more details. Some will charge a premium for the via-in-pad (HDI) PCB layout designs while some will consider it the normal process for their factory.

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kumarb

#87039

PCBA was swollen after SMD | 9 September, 2021

more...

if you want to source from the #1 PCB shop in China, then there is Shennan Circuits. Again, unless you have very high annual volumes, they will not deal direct.

Shennan builds PCBs for the military, medical and other high profile accounts. We used them to support HP / Dell for our OEM builds with Halogen Free laminates when others did not understand our specs. Shennan builds very high grade PCBs but you will pay a premium.

Their agent:

Henry Gu（古正国） Green Partner Technology Group Ltd. 深圳市鸿翔莱科技有限公司 B1203-2,1ST Building,Longgang Tianan Cyber Park, -No.441,Huangge Road,Longcheng Street,Longgang,Shenzhen,China Web: http://www.green-partner.com.cn Tel: +86-755-26451937 Fax: +86-755-26067649 Email: henrygu@green-partner.com.cn Skype: gsgtech

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ProcEng1

#87045

PCBA was swollen after SMD | 9 September, 2021

Your boss didn't think so? What was his/ her theory? Was this resolved?

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kumarb

#87047

PCBA was swollen after SMD | 9 September, 2021

Forgot to ask earlier - what is the TG rating for your laminate? If not selected already, use a high TG rating like TG155 or TG170 laminates for the ROHS temps. Never saw swollen PCBAs with such rated PCBs to date.

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Paul R. Carter

#87091

PCBA was swollen after SMD | 22 September, 2021

Was this problem solved? What did your boss do to come up with a solution? Have you contacted the PCB supplier? Ask them to have a review on this and give a proper solution. Consider changing your PCB supplier. You got the bad set of PCBs that may be due to the lamination defect. Compare the PCB manufacturing teams you know or your near locality and choose the supplier who has a good electronics manufacturing team with the latest machinery and technologies.

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