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component removal question
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t3hsheepdog



Joined: Jun 22, 2007
Posts: 8
Location: philadelphia

PostPosted: Sun Jul 01, 2007 9:20 am    Post subject: component removal question
Subject description: chips and such
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I've been practicing removing components from scrap pcbs before I do it for real on some other stuff but i've been nervous about a few things. is it ok if the chip itself gets hot? how much take? also, whats the best way to reduce damage to the pins themselves when removing from the board? I don't like how I've been bending them to remove them from the board. are they still usable if I reallign the feet?
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shawn



Joined: Dec 13, 2005
Posts: 209
Location: savannah

PostPosted: Sun Jul 01, 2007 9:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Generally it depends on the chip but they suggest only a few seconds for it to get hot then take a break to let it cool. Personally I'd buy a desoldering gun like the Hakko 808. You can remove a chip in under 30 seconds. It's basically a soldering iron with a vacuum built in. you can remove solder from just one pad in 2 seconds. No joke. It's not cheap, running about $80 but it is totally worth every penny if you ever remove components.

http://www.tequipment.net/ProductImages/Hakko/808_gun.jpg
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frijitz



Joined: May 04, 2007
Posts: 1734
Location: NM USA
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PostPosted: Sun Jul 01, 2007 10:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Or use the Bissell technique -- heat the board up with a propane torch and then thwack it against something. Very Happy
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t3hsheepdog



Joined: Jun 22, 2007
Posts: 8
Location: philadelphia

PostPosted: Sun Jul 01, 2007 11:50 am    Post subject: Reply with quote  Mark this post and the followings unread

how much heat can ICs take without getting damaged?
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para



Joined: Oct 16, 2006
Posts: 276

PostPosted: Sun Jul 01, 2007 12:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

a $20 heat gun will get you to 700 and 900 degree's pretty fast - never thought of doing Ian's method though. thats got to the winner.



steven
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etaoin



Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL

PostPosted: Sun Jul 01, 2007 12:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

t3hsheepdog wrote:
how much heat can ICs take without getting damaged?


That will depend on the IC and should be in the datasheet. Larger ones usually can take somewhat more (heat needs to travel further from the pins to the chip), recent ones are also likely to have greater tollerance than, say, 1970's MOS.

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doctorvague



Joined: Mar 14, 2007
Posts: 281
Location: new mexico
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PostPosted: Sun Jul 01, 2007 12:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

frijitz wrote:
Or use the Bissell technique -- heat the board up with a propane torch and then thwack it against something. Very Happy


And then play "Dig the hot chip from the carpet" Very Happy
Nothing like the smell of singed floor covering in the morning.

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toppobrillo



Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
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PostPosted: Sun Jul 01, 2007 2:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

i use a "sold-a-pult" solder-sucker like the one here:

http://www.stanleysupplyservices.com/product-detail.aspx?pn=114-202

very fast, just heat the joint and hit the button. poof! with a little practice, one plunge per pad is all you'll use.

if you are worried about it, you can use a heat-sink between the solder joint and the IC body.

in any case, work quickly, to avoid damage to both semiconductor and PCB traces.

josh
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goldenechos



Joined: Jun 06, 2007
Posts: 201
Location: Marshall, NC
Audio files: 1

PostPosted: Sun Jul 01, 2007 2:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

I like to use solder wick. I find it to clean up more effectively then the hand held "solder sucker."

If you have the money, a rework tool (with vacuum) is REAL nice.

TR
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shawn



Joined: Dec 13, 2005
Posts: 209
Location: savannah

PostPosted: Sun Jul 01, 2007 3:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Using the heatgun then knocking the parts off I've always found to be messy. Not only do you knock out the part but you also knock out the solder. When I did it this way I used a box to catch all the parts. Didn't enjoy the toxic smell if you heat the board too much either (this is when I salvage all parts from a board). The Hakko gun is purely amazing and I can't stress enough how useful that thing is. Maybe I should shoot a video sometime using it just to show how easy it is to remove an IC from a board.
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