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smithy

Joined: 27 Apr 2008 Posts: 2906 Location: Sydney, Australia
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Posted: Wed Mar 11, 2009 11:50 pm Post subject: First attempt at SMD desolder! |
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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  |
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Neon_WA

Joined: 08 Nov 2008 Posts: 7146 Location: Margaret River, West Australia
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Posted: Thu Mar 12, 2009 12:15 am Post subject: |
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better than my first attempt, smithy
i started using a heat-gun but found it still a bit hit n miss
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
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
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
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  _________________ There are 10 types of people in this world:
those who understand binary and those who don't. ~Author Unknown
http://www.x86-guide.net/Neon-WA/en/collection.html |
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johnorun

Joined: 04 Apr 2008 Posts: 3364 Location: Chicago, IL- US
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Posted: Thu Mar 12, 2009 1:24 am Post subject: Re: First attempt at SMD desolder! |
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| 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  |
Congrats, Chris!
Looks like you're getting talented...
I guess you won't need my services anymore>>>  |
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CPUShack

Joined: 16 Jun 2003 Posts: 34259 Location: State of Jefferson, USA
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smithy

Joined: 27 Apr 2008 Posts: 2906 Location: Sydney, Australia
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Posted: Thu Mar 12, 2009 6:12 am Post subject: |
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Brings a whole new meaning to embedded  |
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susl45

Joined: 27 Dec 2007 Posts: 3179 Location: CHU
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Windmiller

Joined: 24 Jun 2005 Posts: 1716 Location: Chapel Hill, NC
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Posted: Sun Mar 15, 2009 9:04 am Post subject: |
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That is awesome John!! |
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cooperalp

Joined: 14 Feb 2009 Posts: 688 Location: Alberta
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Posted: Mon Mar 30, 2009 11:50 pm Post subject: |
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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
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Posted: Tue Mar 31, 2009 4:28 am Post subject: |
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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 Posts: 7146 Location: Margaret River, West Australia
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Posted: Mon Apr 06, 2009 12:14 am Post subject: |
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heres my desolder job on a alpha using the frying pan technique i did for someone  _________________ There are 10 types of people in this world:
those who understand binary and those who don't. ~Author Unknown
http://www.x86-guide.net/Neon-WA/en/collection.html |
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CPUShack

Joined: 16 Jun 2003 Posts: 34259 Location: State of Jefferson, USA
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Neon_WA

Joined: 08 Nov 2008 Posts: 7146 Location: Margaret River, West Australia
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Posted: Mon Apr 06, 2009 12:57 am Post subject: |
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| 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
do i need to leave it longer.. or is there something else i'm missing  _________________ There are 10 types of people in this world:
those who understand binary and those who don't. ~Author Unknown
http://www.x86-guide.net/Neon-WA/en/collection.html |
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johnorun

Joined: 04 Apr 2008 Posts: 3364 Location: Chicago, IL- US
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Posted: Mon Apr 06, 2009 1:06 am Post subject: |
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| 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
do i need to leave it longer.. or is there something else i'm missing  |
The hydrochloric acid leaves a black residue where the lead solder was.
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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