the only real luck that i had doing this sort of thing is water based liquid
flux.......kestler product....hand pump
de soldering pump....manual kind...a 33 watt element.......not to destry the
ic's from heat......and a little fan blowing away from the board as not to
cool of the iron but to let fumes go the other way.......out the window...
using a small paint brush coat the area to be desoldered...heat pin with
iron desuck with pump....each pin.... if you don't get it the first time
don't worry....move on to another pin as not to heat the ic in the same
place for more than 10 seconds.......when all pins look pretty empty take
small needle nose pliers and wiggle the pin from the solder side till
loose.....remove ic....my sucess rate is very high ..maybe 1 outta 10 was
damaged.<G>
when you start talking that it may take a couple hours to remove ic's...vers
you having to work a weeks pay to buy the ic's i find it no at all that bad
a decision...tim
-----Original Message-----
From: Ian Smith <iansmith@NCINTER.NET>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Thursday, December 30, 1999 12:36 PM
Subject: [OT] How to desolder old components?


>I have a number of useful chips on junk boards that I want
>to use with some PIC Microcontrollers by Microchip, but am not
>experienced on desoldering.  I know many boards are made with
>lead solder, so I work in well ventilated areas.
>
>Anyone know an easier way than prying ICs off while heating
>the pins and still having a working chip at the end of it all?
>Any solvents that eat solder? Maybe solvents that eat the
>circuit board away? Some sort of oven arrangement? Magic?
>
>On a related note.. anyone have tips on how to get the silicon
>wafers out of dead ICs?  I have used tools to chip and scrape
>away the black whatever and have about a dozen successes.  Yeah,
>it took a long time, I destroyed a lot of (already dead) chips
>and being slightly obsessive compulsive really helps after a
>few hours of picking away at the case with a needle.  :-)
>Perhaps something the (surprise!) eats away the case?
>
>Happy New Year!
>
>--
>IanSmith@erie.net