Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!cs.utexas.edu!sun-barr!texsun!convex!artemis!harper
From: harper@artemis.uucp (David Harper)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Desoldering Chips
Keywords: Desolder w/o destroying board?
Message-ID: <1531@convex.UUCP>
Date: 15 Aug 89 11:53:54 GMT
References: <1846@uceng.UC.EDU> <360@donk.UUCP> <[1427.2]comp.ibmpc;1@point.UUCP> <15014@dartvax.Dartmouth.EDU>
Sender: news@convex.UUCP
Reply-To: harper@artemis.UUCP (David Harper)
Organization: Convex Computer Corporation, Richardson, Tx.
Lines: 39

In article <15014@dartvax.Dartmouth.EDU> genemans@mac.dartmouth.edu (Jan Genemans) writes:
>In article <[1427.2]comp.ibmpc;1@point.UUCP> wek@point.UUCP (Bill Kuykendall) writes:
>>A simpler solution is to destroy the board with a pair of dykes and clean
>>the legs off after the fact.  The torch trick sounds a little radical for
>>heat sensitive devices (not to mention human breathing apparatus).
>
>What if you have a board with an 8086 processor that is soldered on the board.
>I want to remove this chip and replace it with a V30.  Is there an easy way of
>doing this without destroying the board with dykes or a blow torch?
>
>
> / Jan Genemans      |   USENET:  Jan.Genemans@Dartmouth.edu             \
>/  ADP               |   UUCP: ...!dartvax!mac.dartmouth.edu!Jan.Genemans \
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> \ Kings Point, NY  11024      |      "Live long and prosper"  -Spock    /

Removing soldered in chips from a board is always a pain.  The best way to do
it is to use a Pace desoldering station, assuming you have access to one.  If
not, a GOOD solder sucker should also work but will probably take you a little
longer.  If you are not interested in saving the old 8086, the fastest way   
(and probably the best way for the motherboard itself) is to take a pair of
dykes and clip each of the pins from the 8086.  These can then be easily
removed from the motherboard by heating the back side of the motherboard with
a low wattage iron (15W-25W) while holding onto the pin on the front side with
a pair of needle nose pliers.  Once all of the pins are out you can go back
over the board with the solder sucker and easily clean out each of the holes.
You might also consider installing a socket for next time :).  BTW, I have
used the torch trick in the past to remove wire wrap sockets that were soldered
into prototype boards and it worked quite well for me.  Assuming it's done 
from the back of the board it should not pose any problems for heat sensitive
devices as long as you don't linger too long on any given device.


Dave Harper    -     Convex Computer Corp.            E-mail address:
3000 Waterview Pky.  Richardson, TX 75081             harper@convex.COM
(214) 497-4525 (W)   (214) 727-4206 (H)
Dave Harper    -     Convex Computer Corp.            E-mail address:
3000 Waterview Pky.  Richardson, TX 75081             harper@convex.COM
(214) 497-4525 (W)   (214) 727-4206 (H)