Electronics Forum: found (Page 1 of 329)

Voids found

Electronics Forum | Thu Mar 02 04:44:48 EST 2006 | EC

Hi, We found voids on BGA. Understand IPC stated as long as not more than 25% should be fine. So, is there any standard stated how many voids in BGA can be allow. Appreciate your help......

Voids found

Electronics Forum | Thu Mar 02 07:57:25 EST 2006 | davef

Voids in BGA most often are a process indicator, you know unless either they're huge or there's lots of them.

Voids found

Electronics Forum | Thu Mar 02 09:23:05 EST 2006 | Bob R.

I never understood the statement "process indicator". The 7095 committee used that wording but didn't explain it. Other than really unusual cases such as champagne voiding, BGA voids are not a reliability issue. A half dozen studies have come to t

Wicking-solder found under mask

Electronics Forum | Thu Jul 05 20:30:00 EDT 2001 | dlkearns1

I've never seen this and was wondering how bad is this? We've tried to re-create this defect, but could not. Comments????????

Wicking-solder found under mask

Electronics Forum | Thu Jul 12 20:53:59 EDT 2001 | davef

Hussman: Please help us understand how knowing the profile will point us in the direction of how solder got under solder mask.

Wicking-solder found under mask

Electronics Forum | Thu Jul 12 10:45:42 EDT 2001 | Hussman

Since your customer is complaining, you'd better be pro-active. Doesn't mean they're right, but without customers, life sux alittle. Anyway, ask them for a profile of the 5 reflow processes. If they don't have that and you have a profiler, ask if

Wicking-solder found under mask

Electronics Forum | Fri Jul 13 01:34:13 EDT 2001 | dlkearns1

Quick update on my issue of " wicking ". I had some talk with the company QA guy. Told him I saw no wicking on the test panels at 30X. The next day he came up to me and said, he kinda saw a little something at 60X then verified that at 100X, So, he

Wicking-solder found under mask

Electronics Forum | Mon Jul 16 08:56:56 EDT 2001 | Hussman

Easy, DL says the customer is telling him after 5 reflow processes they get solder under the mask. He tried it and didn't see anything. DL needs more information to understand why and where this is occurring. So, if he can't duplicate the problem

Wicking-solder found under mask

Electronics Forum | Mon Jul 16 22:40:02 EDT 2001 | davef

Speaking of people we'd like to pimp slap, why did the not-so-quality guy decide to ship defective units, anywho? This sorta says we can't blame the customer any longer. So, it's either blame the fabricator or umm er, sorry to say this ... YOU DL,

Wicking-solder found under mask

Electronics Forum | Thu Jul 05 21:42:28 EDT 2001 | davef

Most of our boards are fabricated with solder mask over bare copper [SMOBC], but we have couple where the solder isn't removed before masking. And ever so offin they's a liddy bit mo' solder than we'd like, which when reflowed, ends-up connecting so

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