[sdiy] mis-soldered IC....

[Peter Grenader]

Not a problem!

(read: welcome to my world)


Friday, go get some solder wick at your local Radio Shack. It's braided
copper wire that is designed to pull and flow the solder from something you
wish to remove.  You place the solder wick over the fillet you want to
remove, then put the iron over that and hold it down with slight pressure.
In a matter of seconds, once the wick heats up, you will see the solder flow
into the brided wick, away from whatever was underneath. Once it stops
flowing, you've probably pulled enough that the once filled pad is clean
again.

YOU HAVE TO DO ONE PIN AT A TIME.  So, repeat this process for every lead.

Depending on the drill size of the hole and whether or not it's plated
through or not, it may take a few hits to remove all of it.  I know on
Blacet boards you have to be do a little at a time.  If you try to lift the
part before the solder is fully removed and you tug on the part too much you
may lift a pad from the PCB and that's when it gets to be a bit of a mess
because you'll have to run jumper wires later to replace the broken trace.

Whether you've blown the part or not is totally up to which one it is.  I've
had good louck with Op amps such as the TL084...but with CMOS, you may be
screwed.  It's all up to the individual circuit.  If you mention which one
you put in backwards, somebody here will probably be able to give you the
411 on it whether it's blapped or not.

There is another tool called a solder sucker, but that takes a bit more
skill and can really lead to destroyed pads in a hurry if you're in a hurry.
SOlder wick is safer by a longshot.

A good way to prevent this is even if the kit doesn't come with them, ALWAYS
buy IC sockets and install them at every IC.  Remember...even if they aren't
in backwards, ICs ar usually the first thing to blow.  So for the future,
it's a lot easier when that happens to simply pull the part form the socket
and put a new one in.

That mp3 you mentioned was called Electrolux.  Go here:

http://www.allegobikes.com/synth.html

good luck,

Peter Grenader




 a ron 7/3/02 10:41 PM, Tom FitzGibbon at fitz at madbbs.com wrote:

> i am working on a paia 9700 kit and I soldered in an IC backwards. Argh!.....
> is there anything i can do
> to remove it, i havnt been able to heat up all the pins at once. is there any
> chance of saving the chip?
> also..... someone sent a link earlier this week of a 9 meg song download....(
> i think it was called
> Ex...something.) I accidentally deleted the mail... could anyone send me the
> link?
> Thanks
> Tom
> 
>