Electronics > Repair

Removing solder from stubborn joints

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grendle373:
"Chip Quick" low melt solder makes quick work of these.  Be sure to get it all off though, I like to resolder with kester 44, then wick that, and you should be good to go.  :-+

nigelwright7557:
I have a solder sucker wit ha hard plastic tip.
The hard tip isnt good for a seal so I put a short piece of soft silicon tubing over the end and that seals much better.
Put solder in hole, heat up with iron, remove iron and quickly move in with solder sucker and suck.

abdulbadii:
Use clean desoldering iron
Unclean one won't work as heat is dismissed to many metal area else including the solder inside the tool

it should work unless target point is contacted to massive conductive plate

BrokenYugo:

--- Quote from: semir-t on October 29, 2021, 06:37:37 am ---When this happens to me, I sometimes do the following:
1. I hold the PCB with left hand
2. I hold the soldering iron with right hand and I am heating the hole that has solder in it
3. When the solder is in liquid state I start moving the PCB and soldering iron (while still trying to heat the hole with solder in it) in one direction (as fast as possible) and then after 10-20 cm I instantly stop. The idea is that inertia will cause solder to exit the hole.

This sometimes works for me and sometimes it doesn't but it's worth a shoot.

--- End quote ---

Works better if you run the board into something, I usually use a roll of solder. Just hold the board a few cm above and flick it into the "anvil". If you cut a part off the board this will usually knock out cut off chunks of component legs too.

geggi1:
This kind of problems is normally pretty simple to solve.
1. You need some kind of clamping to hold the PCB in posisjon this will free up your hand and make you able to work two handed. the clamping can be a small vice, G-clamps, "third hand" device or something similar.
2.  Then you need a solder sucker pump of some kind. This can be some of these cheep piston things with a spring inside just be sure to get one with PTFE tip.
3. Decent solder iron no less than 50W and temperature control. Stannol type is better because there is more mass in the head and this will prevent the temperature from dropping. Weller solder stations is not so good because the small head.
4. set the PCB up in your preferred clamping.
5. heat your solder iron to +400C and put a good bob of solder on top of the solderpad. The bob should cover the pad and be 2-3mm high. Keep the solder hot with the iron.
6. use your piston sucker from the opposite side of the PCB and clean out the via.
7. clean the pad with solder-wick if required.

The most important when cleaning vias is good solder, high temperature and use two hands.

A tip about these piston suckers. use some wd40 or similar penetrating oil inside. the cleaning will be simpler.

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