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Old 4th January 2011, 02:36 PM   #1
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Default Removing solder from PCB eyelets

Iam relacing some caps on a DAC pcb. Removing the old caps is going well, but there is solder remaining in the eyelets. Wicking does not help. They are too small for toothpicks. What a PITA! Any suggestions would be appreciated. Thanks
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Old 4th January 2011, 02:44 PM   #2
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Try a Desoldering Vacuum Bulb.

Radio Shack #64-2086 or #64-2060
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Old 4th January 2011, 02:56 PM   #3
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Rather than risking damaging the board just heat up the pads when you insert the new components.
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Old 4th January 2011, 03:26 PM   #4
macboy is offline macboy  Canada
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I sometimes remove as much as I can using a pump and/or wick, then carefully drill out the last little bit using a drill that is just slightly smaller than the hole. I have a set of numbered drill bits (#61 - #80) and I use an X-acto knife handle as a chuck to manually drill out the solder. The solder is so much softer than the copper that it can be removed without damaging the plated hole.
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Old 4th January 2011, 03:30 PM   #5
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Hello,
Try this it has worked for me.
Before you remove the existing part use wick and your iron to remove as much of the original solder as possible. If you have any luck many of the eyelets will remain open when you remove the part. Strip a piece of stranded wire, twist it snug between your fingers, tin the very end with your iron then snip off the end on a diagonal to make it sharp. Apply some heat to the closed eyelet and insert the wire where you were thinking of using the toothpick. The wire will act as a long skinny piece of wick.
Done!
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Old 4th January 2011, 03:38 PM   #6
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Heat it up. Blow through it. If that doesn't work, heat it up and rap it on the bench at an angle that will force the molten solder through and out the eyelet.

It's messy, but it works.
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Old 4th January 2011, 03:42 PM   #7
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Quote:
Originally Posted by Andrew Eckhardt View Post
Heat it up. Blow through it. If that doesn't work, heat it up and rap it on the bench at an angle that will force the molten solder through and out the eyelet.
Seconded.
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Old 4th January 2011, 06:03 PM   #8
ArtG is offline ArtG  United States
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Thirdid!
I do this all the time. Be aware, however, that molten solder will fly around, and sometimes end up in places you don't want it, like on your hand. Just be careful.
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Old 4th January 2011, 06:27 PM   #9
tomchr is offline tomchr  United States
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Quote:
Originally Posted by john dozier View Post
Iam relacing some caps on a DAC pcb. Removing the old caps is going well, but there is solder remaining in the eyelets. Wicking does not help. They are too small for toothpicks. What a PITA! Any suggestions would be appreciated. Thanks
This is the best solder sucker I've ever used. On stubborn holes, I will re-tin the hole and suck out the new solder. That usually works. A little flux might help too.

~Tom
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Old 4th January 2011, 06:44 PM   #10
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Thanks for the tips. I ordered a desoldering iron and bulb from parts express. Had excellent review and $30 delivered. I will let you know how it works. Thanks again. Btw tomchr, there was no link inyour reply. I would like to know what sucker you are using.
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