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Desoldering through-hole ICs

Discussion in 'Electronic Basics' started by Steve, Oct 12, 2004.

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  1. Steve

    Steve Guest

    I'm going to need to desolder about sixty 10-pin DIP ICs. I need to do this
    without damaging the board or the components.

    I've tried with my basic soldering iron and it has been a painful and time
    consumiung process - my soldering skills are limited anyway. The main
    problem seems to be that, although it seems all the solder has been removed
    (with a solder sucker pump), some must still be there as the pins refuse to
    budge.

    So I'm looking at getting a desoldering iron such as this one:
    http://tinyurl.com/5y2h9
    (RS code 604-5012, 47UKP)
    They seem to have a hollow tip and sucker built-in. If it worked I'd gladly
    pay the money. But as someone inexperienced with a soldering iron, am I
    likely to still have trouble doing it this way? Is there a better way?

    Thanks,
    Steve
     
  2. Graham Knott

    Graham Knott Guest

    You can buy an attachment which replaces the bit. It's a block of metal
    which fits over all the pins of the IC and desolders them simultaneously.
    I don't know where mine came from.
    If you desolder pins one at a time then wriggle the pin with a pair of
    pliers to ensure that it is completely desoldered. If it's not then resolder
    and try again.
     
  3. CBarn24050

    CBarn24050 Guest

    Subject: Desoldering through-hole ICs
    Not sure if ive ever seen a 10 pin dip. The best way is ro heat all the pins
    together, Weller make some heads for their irons. If you use a sucker then you
    need to get all the solder out in 1 suck, if you fail resolder the pin and try
    again, then grab the pin with some pliers and wiggle it untill it comes free.
     
  4. John Larkin

    John Larkin Guest


    Steve,

    Consider heating all 10 pins at once, and just lifting the part out.
    Yoy can clean up the holes with solder wick afterwards. You could heat
    from below, with an adjustable paint-stripping kind of heat gun and a
    simple metal mask, or make a small rectangular solder pot. There are
    also big soldering iron tips that heat all the dip pins at the same
    time, but you'll need a lot of heat to drive one of them.

    John
     
  5. Guest

    Apply heat with your soldering iron, suck it away with the pump. Then use the
    tip of a flat screwdriver to carefully pull the chipleg to the otherside in
    the hole. Should feel like breaking a crispy cake.
    When completed for all pins carefully lift the chip. And watch for any still
    fastened pins. If so try with the screwdriver again, or repeat the first
    course of action.
     
  6. Neil

    Neil Guest

    I found that solder wick was pretty good - does cost a bit though.
    Sometimes needed to reflow a bit of solder back on the allow the wick to
    work.
    For me, it is eaasier than the desolder pump / sucker thingie.
    hth
    Neil
     
  7. But he says he wants to keep the board intact. While I've never tried
    to use a heat gun carefully, when salvaging parts using a heat gun it
    can make a mess of the board.

    I tend to use a combination of the solder sucker and solder wick. Use
    the sucker to get most of the solder, then work pin by pin to make sure they
    are loose. I have a cheap Radio Shack desoldering iron, I'm not sure if
    that's one under question, which I paid under ten dollars for about ten years
    ago. I thought it worked decently, but the tip wasn't plated and it corroded
    fairly fast. At the time, the store carried no replacement tips, though
    the tip was replaceable. I kind of put the thing away when the tip got too
    bad, and really haven't gotten back to it, though Radio Shack does carry
    a replacement tip these days.

    I have a standalone solder sucker, also bought at Radio Shack, and that seems
    to have more sucking ability than the desoldering iron. Offsetting that is
    the fact that you have to heat up the pin with an iron and then quickly use
    the sucker.

    Once I get most of the solder off with the sucker, then I may need to do
    some more work with the solder wick, this seems to be the case with double
    sided circuit boards.

    Michael
     
  8. Bruce

    Bruce Guest


    If you can get a desoldering tool with heated pencil and desolder vacuum built-in
    go for it. We use a Hako 808 in our shop, and we can remove components from
    the boards without damaging components or boards on any PCB's. Double-sided,
    singles and multi-layer.

    Double-sided boards are tough with desolder braid, and hand pumps because
    you never get all the solder heated or removed from the component side. The
    solder side looks clean, but there's still plenty of solder left under the component,
    and trying to pry it off lifts pads & traces.

    Too much heat thermally shocks & often kills the part you're trying to remove
    so you can't keep the heat on it too long. Heat guns warp the PCB, and destroy
    the majority of components too, so I wouldn't recommend trying one of these either.

    Another "less expensive" option is a flat-blade surface mount removal tool that
    replaces your irons soldering tip. Heat the whole row of pins, and lift one side
    of the DIP all at once. You'll bend pins on the opposite side of the IC when lifting
    it, but you don't trash the board or components. Then do the other side, straighten
    the pins, and you're done.

    You can probably find something similar to a Hako 808 on eBay. They're worth
    the investment if you need to do a lot of PCB repair/component removal.
     
  9. john jardine

    john jardine Guest

    Easy!.
    An electric hot air gun. The kind used for stripping paint.
    Heat up then pick off the IC's with tweezers.
    Be careful!
     
  10. Steve

    Steve Guest

    Thanks very much everyone! So many great suggestions there - I will give
    them a try.

    Thanks again for the terrific response and help.

    Steve
     
  11. Andrew Holme

    Andrew Holme Guest

    I second that. I never want to use a sucker again. Solder wick works
    like magic. I've never damaged a pad using wick and it leaves the
    area completely clean.
     
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