Advice on Desoldering an IC

[W2HX]

Just be careful around cerroblend. According to Wikipedia...

"... is a metal alloy that is useful for soldering and making custom metal parts, but which is toxic to touch or breathe vapors from." 
"...is toxic because it contains lead and cadmium, and contamination of bare skin is considered harmful. Vapour from cadmium-containing alloys is also known to pose a danger to humans. Cadmium poisoning carries the risk of cancer, anosmia (loss of sense of smell), and damage to the liver, kidneys, nerves, bones, and respiratory system. Field's metal is a non-toxic alternative. The dust may form flammable mixtures with air."


73 Eugene W2HX
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-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Chuck Guzis via cctalk
Sent: Friday, April 15, 2022 7:42 PM
To: Fred Cisin via cctalk <cctalk at classiccmp.org>
Subject: Re: Advice on Desoldering an IC

For very-difficult de-soldering, I use a variation on the Chip-Quik
idea.   I take a hunk of Cerrobend 158 fusible alloy and a file and make
a small pile of powder from it.  I then pack the powder around the pins of the IC to remove and heat the area using the light from a 75 watt
PAR-38 halogen reflector lamp.    (apply from the reverse side of the
PCB).  In very little time, the area of the board heats up enough to
melt the cerrobend and it fuses with the solder.   The part can then be
easily removed (SMT stuff just slides off).   Since the board never even
gets to 100C, everything else stays in place and you don't burn the
board or lift traces.   Clean up with a toothbrush.  Discard the fused
metal.   I suppose that instead of the lamp, you could use a hot-air
rework tool set low.

Anyway, that's what I do.

--Chuck