Raśl Cantero
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-----Original Message-----
From: Kriesel Alan (NTC/BS-DA) [mailto:[log in to unmask]]
Sent: Thursday, January 07, 1999 6:13 AM
To: Raul Cantero
Subject: RE: Assy: Is it possible to rework a BGA socket?
Hola Raul,
We have a Conceptonics Freedom Series 2000, BGA/FP rework station, it works
really well. If this socket can be removed this machine or similar type of
machine should be able to do it. The concern is however that the socket
material may not withstand the focused high temperature convention temp.
used to remove BGAs and FP devices. Possibly the socket temp. limit could
be determined from the component spec. sheet and compared to a thermal
couple reading of the temp. a device experiences during the removal process.
I would think that damage to the board would be a bigger concern than saving
the socket.
Good Luck.
Alan
----------
From: Raul Cantero
To: Alan Kriesel
Subject: FW: Assy: Is it possible to rework a BGA socket?
Date: 07. January 1999 6:22PM
Raśl Cantero
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Personal e-mail: [log in to unmask] or [log in to unmask]
-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: Wednesday, January 06, 1999 6:29 PM
Subject: Assy: Is it possible to rework a BGA socket?
Hey All you Einsteins out there!!
I gotta' problem...('course you do Steve, or you wouldn't be bugging the
TechNet now would you?) I had a phone call from a acquaintance of mine
wanting to bring two prototype boards over to rework a BGA socket, (actually
there's two on each board). No problem I said, bring em' on over. BOY O'
BOY! Did I ever open my big yap this time! These sockets aren't like
anything I've ever reworked before.
They're from a company called CTI, and they're called "Z-Lok" sockets, and
they're surface mount. They've got this big beefy plastic housing that goes
all the way down almost to the surface of the PCB, and has a little metal
handle off to one side that actuates some little "arms" inside the socket
that grab each ball on the BGA for good contact, but won't deform the balls
so you can still use the BGA directly on a board after being in the socket
if you wanted to.
The problem is that the socket has two locating pins on the bottom, which
are used to accurately locate the socket (into holes drilled in the fab)
when the board was first built. There was a big time screw-up by either the
fab vendor, the board lay-out person, or the dimensional drawing for the
socket itself, but what has happened is that the BGA's contact pins are now
soldered one row off! I'm being asked if I can pull this socket up, clip the
plastic pins off, and put it back down on the board the way it's supposed to
go...sounds like fun huh? This board is 12.5" X 18.5" and .065" thick...and
the sockets are in the middle of the board.
I called back to CTI (They're in Indiana, but closed now) to talk with
somebody there to find out how to rework one of these monsters...if it's
possible.
I personally think that the socket is not meant to be reworked, it's a test
socket and has to cost at least a hundred bucks or so. I think that once
they're soldered down that's it. But I thought I'd ask ya'll to see if any
of you have ever had to attempt something like this. There's only two of
these boards, I don't wanna take a chance turning em' into scrap if I can
help it...
Thanks!!
-Steve Gregory-
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