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From: | |
Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 18 Dec 2001 23:20:13 -0800 |
Content-Type: | text/plain |
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Hello,
We have encountered major BGA voiding issue. The void is sometimes up to
70% of the joint. Under X-ray inspection we found a blind 0.006" uVia,
0.01" deep under each void. Other BGA solder joint on board w/o uVias do
not have any void problems. Board is gold over Nickel finish and 2mm
thick.
Things we tried:
Reflow profile - WS/ no-clean paste, longer soak
Washing/ baking the bare PCB
Reworked by cleaning the uVias/pads and filled with solder but still
seeing void
Has anyone seen this before? Micro-sectioning clearly showed the void
originated from the uVia. We are trying to convince the board house that
it's not our process.
Rgds,
Peter
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