Electronics Forum | Wed Jan 10 13:02:50 EST 2007 | aj
We ran 4 boards without shields and they work fine.
Electronics Forum | Wed Jan 10 13:03:50 EST 2007 | aj
We also took the shields off one of the boards and retested and it still fails...
Electronics Forum | Thu Jan 18 10:59:26 EST 2007 | aj
All, apologies for dragging this thread up again but after some xray analysis it looks like there is no issue with the soldering of any components namely 2 x bga and 1 qfn device which are placed within the shielding area..but yet they fail to perfo
Electronics Forum | Tue Jan 09 22:33:45 EST 2007 | Guest
Dear AJ, Try removing shield ,test it, verify if it would perform as the previous runs . If not, there maybe something wrong with device or as one of our collegue mentioned that there is possibilty the your customer change some components.If the
Electronics Forum | Wed Jan 10 09:57:08 EST 2007 | realchunks
Shields can carry a large thermal mass. If you ever tried removing one in repair, you'd find out how hard they can be. Also, they do deflect air flow. So in a convection oven, your air flow will be turbulent, which also will affect your reflow.
Electronics Forum | Fri Jan 12 00:59:04 EST 2007 | Guest
Your evaluation results confirms that Real Chunks is right on thermal mass absorption of the shield, that probably brought cold spots during reflow . I agree with his suggesttions as well.
Electronics Forum | Fri Jan 12 02:11:32 EST 2007 | aj
All, I ran a failed board back thru reflow with shields removed and it works fine. I think that tells me something ? Thanks all who contributed to the thread. aj...
Electronics Forum | Tue Jan 09 13:01:17 EST 2007 | stepheniii
Not unless it's a case of "the only difference is..." What I mean by that is more than once I've been told the only difference in a new rev is one component or one change. But the truth was that was the only reason for the change, and in fact there
Electronics Forum | Sat Jan 13 17:19:15 EST 2007 | aj
Hi all, What length of time is recommended for the "soak stage"? aj...
Electronics Forum | Tue Jan 16 16:21:08 EST 2007 | slthomas
How close is the "fence" to the part in question?
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