What is the surface finish on your PCBA?




Necong,



What is the surface finish on your PCBA?



Regards,

George

George M. Wenger

Andrew Wireless Solutions

Senior Principal FMA / Reliability Engineer

40 Technology Drive, Warren, NJ 07059

(908) 546-4531 [Office]  (732) 309-8964 [Cell]

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-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Cong He

Sent: Thursday, December 04, 2008 9:09 PM

To: [log in to unmask]

Subject: [TN] BGA soldering open issue



dear all:



I am facing a problem of bga soldering.



when the board have just soldered ,it pass all test.

But after sometime, maybe for a few weeks,

some of the bga balls opened. the function became normal if i press the 

chip on the top side.



It seems that the pcb didn't warp much,it seems even no warp at all.

Does any of you know why? And how to improve? 













Hechong



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