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Cleanly unsolder and remove a 2x20 pin header?
Cleanly unsolder and remove a 2x20 pin header?
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Old 16th March 2018, 07:19 PM   #1
matt_garman is offline matt_garman  United States
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Cleanly unsolder and remove a 2x20 pin header?
Default Cleanly unsolder and remove a 2x20 pin header?

I made a little HAT PCB for the Raspberry Pi (see this thread for more details). Since the fab sent me more boards than I actually needed, I decided to build them all up for others who are interested in this design.

Unfortunately, on one of the boards, I had a total brain lapse and soldered the 2x20 pin header on backwards. See attached pic: that header circled in orange should be on the bottom of the board, not the top. Yes, I managed to solder all 40 pins before realizing my mistake!

I have tried to soak up all the excess solder with solder wick. It looks fairly "clean" to me. But clearly there is still some solder that I'm unable to wick up. And with 40 solder points, it only takes a couple to keep the whole thing stuck.

I don't want to force it, as I'm afraid I'll rip up the PCB traces. The board is good otherwise, it would be a shame to waste it.

Anyone have any thoughts on how I might get that guy off?

Thanks!
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Old 16th March 2018, 07:45 PM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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You can buy soldering iron attachments that heat up a complete component in one go.
Maybe something a 40 pin DIL using just one side of it might do it.
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Old 16th March 2018, 07:45 PM   #3
adam1016 is offline adam1016  United States
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Get a solder sucker! They're great for things like this, and for me at least usually get a pin moving freely in a couple seconds.
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Old 16th March 2018, 07:46 PM   #4
AudioLapDance is offline AudioLapDance  Canada
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Hey Matt, saw this in the 1387.

If you don't care about the header (and I assume you don't) just use cutters and chop the plastic up every 2-4 sections and remove those one at a time.

As well, pin headers will slide through the plastic base when heated. So just heat up a single pin and then grab it from the top with pliers and give it a forceful tug.

Good luck,
Cheers,
Jeff
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Old 6th April 2018, 11:50 PM   #5
MAAC0 is online now MAAC0  Portugal
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This is what I use, and also get the larger 1.5mm tip. You'll need it.


DIC - SC 7000 Z - Desoldering gun 120 W


Mine didn't cost 445€...
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Old 7th April 2018, 12:13 AM   #6
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by adam1016 View Post
Get a solder sucker! They're great for things like this, and for me at least usually get a pin moving freely in a couple seconds.
There's a bit of knack with a solder sucker.
Heat up soldered joint then remove iron quickly.
Place solder sucker over molten solder at "90 degrees" to the board and press button. If you aren't at 90 degrees the vacuum will disappear around the solder sucker tip. The idea is to suck out solder from the via too.
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Old 7th April 2018, 12:39 AM   #7
jfetter is offline jfetter  United States
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Quote:
Originally Posted by AudioLapDance View Post
Hey Matt, saw this in the 1387.

If you don't care about the header (and I assume you don't) just use cutters and chop the plastic up every 2-4 sections and remove those one at a time.

As well, pin headers will slide through the plastic base when heated. So just heat up a single pin and then grab it from the top with pliers and give it a forceful tug.

Good luck,
Cheers,
Jeff
I use this method too. Just wet the connector (after flush cutter dicing) with fresh solder, med-hi heat 780 and heat the backside , if done correct they fall out. I do two or four pins max per step.
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Old 7th April 2018, 02:03 AM   #8
OffGridKindaGuy is offline OffGridKindaGuy  United States
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I'd solder suck all I could and use a hot air gun. Removed many that way..
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Old 7th April 2018, 02:15 AM   #9
DUG is offline DUG  Canada
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Quote:
Originally Posted by AudioLapDance View Post
Hey Matt, saw this in the 1387.

If you don't care about the header (and I assume you don't) just use cutters and chop the plastic up every 2-4 sections and remove those one at a time.

As well, pin headers will slide through the plastic base when heated. So just heat up a single pin and then grab it from the top with pliers and give it a forceful tug.

Good luck,
Cheers,
Jeff
Best way to save the board...headers are cheap.
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Old 6th May 2018, 04:45 PM   #10
Fast Eddie D is offline Fast Eddie D  United States
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Q-B-5AS MENDA/EasyBraid | Soldering, Desoldering, Rework Products | DigiKey
8342-50G MG Chemicals | Mouser

I remove chips without damaging them using these tools.
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