First attempt at SMD desolder!

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smithy



Joined: 27 Apr 2008
Posts: 2906
Location: Sydney, Australia

PostPosted: Wed Mar 11, 2009 11:50 pm    Post subject: First attempt at SMD desolder! Reply with quote

Here it is - my first attempt at an SMD desolder using a heatgun. A couple of tracks are still attached to legs but I can easily get these off with my soldering iron. Now to move on and get those CPUs off boards that have been sawn off Very Happy
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Neon_WA



Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia

PostPosted: Thu Mar 12, 2009 12:15 am    Post subject: Reply with quote

better than my first attempt, smithy Very Happy

i started using a heat-gun but found it still a bit hit n miss Confused

most times now i used an old electric frying pan... let it heat up.. then put the cut down boards in... couple of minutes later lift them off with something so i dont burn my fingers Very Happy

for dips & soldered socket chips i use a modified pair of ice-cube tongs to pull them out cleanly once the solder has melted. Some woolen felt stuck to the jaws makes sure i dont mark the chips and the wool doesnt mind the heat Very Happy

the only time the frying pan has trouble is when the soldered joints extend thru the board a long way and hold the board to high off the plate. To solve this i put the lid on, to let the heat build up.
Not much different from CPUShack's oven method for baked apple chips Wink


SAFETY NOTE Children please do not try this at home as these techniques have been carried by untrained ameteurs in haphazard conditions on items known to contain hazardous substances... fun is'nt it Very Happy

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johnorun



Joined: 04 Apr 2008
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Location: Chicago, IL- US

PostPosted: Thu Mar 12, 2009 1:24 am    Post subject: Re: First attempt at SMD desolder! Reply with quote

smithy wrote:
Here it is - my first attempt at an SMD desolder using a heatgun. A couple of tracks are still attached to legs but I can easily get these off with my soldering iron. Now to move on and get those CPUs off boards that have been sawn off Very Happy

Congrats, Chris!
Looks like you're getting talented...Shocked
I guess you won't need my services anymore>>> Wink
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CPUShack



Joined: 16 Jun 2003
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Location: State of Jefferson, USA

PostPosted: Thu Mar 12, 2009 1:26 am    Post subject: Reply with quote

I think this is now appropriate Smile

http://www.cpushack.com/CookingAppleCPUs.html

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smithy



Joined: 27 Apr 2008
Posts: 2906
Location: Sydney, Australia

PostPosted: Thu Mar 12, 2009 6:12 am    Post subject: Reply with quote

CPUShack wrote:
I think this is now appropriate Smile

http://www.cpushack.com/CookingAppleCPUs.html


Brings a whole new meaning to embedded Laughing
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susl45



Joined: 27 Dec 2007
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Location: CHU

PostPosted: Thu Mar 12, 2009 6:23 am    Post subject: Reply with quote

Good job, smithy, Congrats!
You start to be a DIYer Smile

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Windmiller



Joined: 24 Jun 2005
Posts: 1716
Location: Chapel Hill, NC

PostPosted: Sun Mar 15, 2009 9:04 am    Post subject: Reply with quote

CPUShack wrote:
I think this is now appropriate Smile

http://www.cpushack.com/CookingAppleCPUs.html


That is awesome John!!
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cooperalp



Joined: 14 Feb 2009
Posts: 688
Location: Alberta

PostPosted: Mon Mar 30, 2009 11:50 pm    Post subject: Reply with quote

I did my first desolder as well last week.

First I used a torch and almost melted the whole card, I find it way too powerful. Luckily I was able to save the chip.

Then I checked couple of topics on the forum regarding desoldering, thought heat gun would be a good idea., checked the closest stationary store and found out that one brand was on special and got one the same day for $15. There are ones for $80+tax but I think it is unnecessary.

Heat gun works very well for me. It takes about 2 minutes to desolder a chip and it does the job almost smoke free!!


Here is a picture of my desolder.


ALP


Last edited by cooperalp on Thu Apr 02, 2009 10:30 pm; edited 1 time in total
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donutty



Joined: 16 Feb 2008
Posts: 1122

PostPosted: Tue Mar 31, 2009 4:28 am    Post subject: Reply with quote

Beware of cheap electric heat guns! I've gone through about 5 new cheap ones (around £10) but got a good brand one (Bosch) second-hand and it has outlasted all the others put together 100 times over and is still going.

It seems that you really do get what you pay for when it comes to hot air guns, so if you are doing a lot of de-soldering, get one from Bosch, DeWalt etc.
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Neon_WA



Joined: 08 Nov 2008
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Location: Margaret River, West Australia

PostPosted: Mon Apr 06, 2009 12:14 am    Post subject: Reply with quote

heres my desolder job on a alpha using the frying pan technique i did for someone Very Happy
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CPUShack



Joined: 16 Jun 2003
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PostPosted: Mon Apr 06, 2009 12:45 am    Post subject: Reply with quote

now try acid to remove the solder from the pins, and it'll be perfect
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Neon_WA



Joined: 08 Nov 2008
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PostPosted: Mon Apr 06, 2009 12:57 am    Post subject: Reply with quote

CPUShack wrote:
now try acid to remove the solder from the pins, and it'll be perfect


i wont do it on this one, but i will try on another first.

one question.. i have tried acid to remove solder.. but the solder turns black Confused

do i need to leave it longer.. or is there something else i'm missing Laughing

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johnorun



Joined: 04 Apr 2008
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PostPosted: Mon Apr 06, 2009 1:06 am    Post subject: Reply with quote

Neon_WA wrote:
CPUShack wrote:
now try acid to remove the solder from the pins, and it'll be perfect


one question.. i have tried acid to remove solder.. but the solder turns black Confused
do i need to leave it longer.. or is there something else i'm missing Laughing

The hydrochloric acid leaves a black residue where the lead solder was. Sad
It can be removed with gentle scrubbing with a toothbrush. I don't like the greyish steel color that remains even after cleaning, so now I only use acid to remove clumpy solder that sometimes remains on pins after desoldering.

I prefer the thin shiny coat of solder to the grey steel that is exposed with acid.
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