Desoldering (Again)

Rob I'm not surprised you are struggling : a non trivial evolution I'll presume that we are talking DIP, and that you can't cut the legs off - as removal without damage to either PEC or device is required. If the chip is "toast" then cut the legs close to the package (e.g. Lindstrom 7191) and remove each leg / clean up each via individually using the same methods but with better access and 14 easy rather than 1 difficult problem. Things which may work include: - solder (sucker) pump - resoldering almost dry joints, to get them dry on the next attempt - lots of flux : flux pen, liquid, gel, jelly (highly recommended) - solderwick rather than a solder pump Things which will work: - Pace SX-90 Sodr-X-tractor or similar hi-end tooling (my experience is that inexpensive and poorly maintained extractors are useless) The technique is to oversolder the joint, suck it dry while wiggling the pin with the tool to preclude adhesion to the via's barrel - a visit to your local wireman (who has the tooling) I'm in Dorset UK; contact me off list if my SX-90 can help Regards Martin -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Rob Jarratt Sent: 10 September 2011 10:07 To: General Discussion: On-Topic and Off-Topic Posts Subject: Desoldering (Again) (resending from a different account, apologies if this is a duplicate) I have a 16-pin IC to desolder and I am struggling. Since I last asked about desoldering I have got a lot better with a de-soldering pump and can now clear the hole in the sense that I see a black hole rather than solder, and I can see daylight through all the holes (but for most of the holes this is only if I angle the board the right way). However, in this case the solder seems to be going all the way through and slightly onto the component side surface where I can't get at it with the pump. I have jiggled the pins to try to break any last bits of solder, but the chip is still very solidly attached. Any advice? Thanks Rob