Steve-
CONGRATULATIONS!!! HIP, HIP, HORRAY!!!!
There was never a doubt ol' Steve MacGyver could do it.
Ryan Jennens
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Paul Klasek
> Sent: Thursday, January 07, 1999 5:28 PM
> To: [log in to unmask]
> Subject: Re: [TN] Assy: STEVE CAN Rework this BGA Socket !!!
>
>
> A little mole-hill cooling off dead planar hey !? ; Steve ; I've
> been crying
> my full vision out by the time I got to the end of this episode
> of that saga
> :
> If Jack didn't invite You to that legend convention ; he's got it
> all inside
> out .
> Takin' about classics !
>
> Thanks for the show ; lokkin' forward to next episode
> paul
>
> PS
> I definitely think (or so) that yo' deserve a public acclamation :
> so all you loose and agile : let's give Steve cheers for his tireless
> efforts keeping the Net wet with tears !
>
> Do you concur Ladies & Gents ???
>
> Just type : Hoy ! ; or certified substitute
>
> AND HIT THE BUTTON ! please
>
>
> > ----------
> > From: Stephen R. Gregory[SMTP:[log in to unmask]]
> > Sent: Friday, 8 January 1999 8:41
> > To: [log in to unmask]
> > Subject: [TN] Assy: I CAN Rework this BGA Socket!
> >
> > Hey ya'll!!
> >
> > SUCCESS! I was able to get that monster off!...(Now I just
> gotta' be
> > able
> > to get it back on right...hehehe) If you remember, the whole
> reason I had
> > to
> > rework it was because somehow they got the hole positions wrong in the
> > board
> > for the two alignment pins at the bottom of the socket, which caused the
> > socket to be soldered one row off on the board. I'm still
> trying to get to
> > the
> > bottom of how that happened (I haven't forgotten your request
> Roger, still
> > workin' the issue...).
> >
> > But I called CTI this morning and talked to them about trying to
> > rework
> > this thing. I was told that they have heard of people reworking this
> > socket,
> > but it's pretty much been hit and miss, and trying this, or trying that.
> > They
> > said the one company that they know of who have got it down is SCI. I
> > guess
> > they build a lot of product that uses this socket and they've had their
> > rework
> > equipment modified to do this socket...you know, special preheater,
> > nozzle,
> > etc.
> >
> > But, getting back to how I did it, it was a "Steve's
> start-up company
> > mode special". Don't laugh too much, 'kay? Sometimes when you don't have
> > all
> > the things you want, you gotta make do with what you have...and
> I think if
> > you
> > use common sense, and take things slow, you can do just about anything
> > anybody
> > else can....maybe not as fast, but you can do it.
> >
> > My rework system is one of them fancy Hakko 850's...you know, the
> > full-
> > vision (your own two-eyeballs), hand held unit. The nozzle I used was a
> > 36mm
> > square one that's normally used for QFP's...this one matched the basic
> > shape
> > of the pins in the socket. I had to take the cam lever, and the "Z-lok"
> > cover
> > off to expose more of the pin's surface to absorb the heat. I
> also used my
> > trusty Fluke multimeter (it has a temperature function which
> you can plug
> > a
> > thermocouple into and see temps real-time) and threaded the tip of the
> > thermocouple into the socket where it could tell me how hot it
> was getting
> > down around the solder joints.
> >
> > I was pretty liberal with the flux bottle, and really coated things to
> > help me
> > with heat transfer. Turned the Hakko on and watched my Fluke. It took
> > about
> > two and a half, to three minutes for me to indicate around
> 210-220 degrees
> > centigrade inside the socket, and then I tested the socket with my
> > tweezers
> > gently at the corner to see if it would move, it moved easily, and I
> > pulled it
> > up without a hitch! Didn't even lift a pad!! YEEE-HAW! Not bad 'fer a
> > in-gun-
> > ear, huh? Usually, you don't want to let us get anything sharp or hot in
> > our
> > hands...(GRIN). The board had a little mole-hill where the socket was
> > until it
> > cooled back down and straightened out. The socket was actually in pretty
> > good
> > shape too, the plastic didn't degrade a bit.
> >
> > Now, I just gotta figure out how to get this puppy located back over the
> > pads
> > accurately without those guidepins, I gotta clip them
> off...I'll let ya'll
> > know how that goes...
> >
> > -Steve Gregory-
> >
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