"Should we thank the EU weenies, or what?"
Thank you, Richard, for using this terminology to identify the species.
I have done so many times in this context privately (just ask my poor
wife), but shied away from it in a public forum.
Indeed, we have plenty of "weenies" involved in this on our side of the
pond as well: Life here in Northern San Francisco (Seattle) is
positively "teeming" with them.
;o)
--- Previous Message in This Thread ---
Subject: Re:[LF] Fodder for Discussion?
From: Stadem, Richard D. <[log in to unmask]>
To: [log in to unmask]
Date: Tuesday, January 19, 2010 10:50:26 AM
> Last week, my 12-year old son's Xbox360 crapped out for the 5th time.
> The first three times, the factory fixed it, the fourth time they
> replaced the Xbox, and this time they directed us to a local game shop
> to have the repair/replacement done. When we went there, the owner
> promptly gave us a new "refurbished" Xbox. When I asked him what
> constituted a refurbishment, he brought me into the back of his shop and
> showed me his used Airvac DRS24, and along the wall, stacked from floor
> to ceiling, were about 200 or more Xbox 360s awaiting rework, excuse me,
> "refurbishment".
> Not knowing that I knew a little bit about BGA rework, the gentleman
> carefully explained to me the complicated nature of the refurbishing.
> How chemical processes (flux), specialized cleaning procedures (water
> wash), something called "re-metallization" (hot air reflow), and many
> other special processes must be followed.
> So I said, "Ok, so you remove the blade from the housing, place it on
> the DRS24, apply flux, bring the nozzle over the part and reflow the
> BGA, clean, inspect, test, and rebox?"
> Needless to say, he looked at me with a little more respect and said,
> "Oh, you must be some kind of engineer." So then we talked, and he
> stated that nearly 100% of the time, with only a few (but very few)
> exceptions, a simple reflow of the BGA is all that is needed to
> "refurbish" the Xbox, and if done properly they can last up to 1 year,
> but seldom longer, due to the heat generated by the BGA during
> operation. He has "refurbished" some blades as many as 6 times in a
> 3-year period.
>
> Had the BGA been 63/37 alloy, soldered with 63/37 solder, this guy would
> not be in business.
>
> So, Lead-free has been good for the American Economy. Should we thank
> the EU weenies, or what?
>
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf Of Marcus Thompson
> Sent: Tuesday, January 19, 2010 11:25 AM
> To: [log in to unmask]
> Subject: [LF] Fodder for Discussion?
>
> Good day to all.
>
> In light of a recent interchange addressing SAC balls on BGA packages, I
> thought that I'd toss a mass-marketed item out here for discussion: the
> Xbox
> 360. Despite the generally kitsch nature of this product, I believe
> that
> some fruitful insights may be taken from the example nonetheless.
>
> In short, how do we define the billion-dollar lead-free SJ failures
> which
> have plagued this particular specimen? As many have observed concerning
> "green" solder formulations, the joints thus formed are more susceptible
> to
> metallurgical failure modes of various types vs. Sn/Pb. Yet, I have
> gleaned
> that some carefully devised testing (by ostensibly impartial
> researchers)
> has demonstrated the converse; promoting the cause for complete
> replacement
> of Sn/Pb across the board (so to speak).
>
> To sum, apart from whiskering concerns (Swatch?), is there clear
> evidence
> that lead-free solder metallurgies per se are indeed a "non-issue?" If
> so,
> where does the case of the "Xbox" product failures need to be finally
> classified?
>
> Thanks again --
>
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