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needing step by step tips for soldering a DC port onto a small circuit board

Posted on 2009-07-02
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Last Modified: 2013-11-17
Hi Everyone;

       Thanks to the help of Gary Case who was a great deal of help from a previously closed post, I gathered important information regarding the necessary steps for desoldering or removing a DC port of a small circuit board of an Averatec 3200 laptop.  Now, I would like to take this one more level.  While I am awaiting a replacement DC port, I would like to go ahead and gather information regarding the steps for installing the new DC port.  From what I gather, the desoldering of the joints which attach the old defective board would be removed, then, a pump would be used to suck all of the solder out of the holes and any flowing flux from the desoldering process.  At the conclusion of all this, there should be 3 clear holes for the legs of the new DC port to stick through.  At this point, I am a little confused regarding what to do next.  For instance, do I simply go ahead and solder the legs of the DC port which protrude through to the back side of the circuit board?  Or, will I need to apply solder to these legs as well?

           Any assistance regarding the proper techniques in soldering a new DC port onto a circuit board will be greatly appreciated.  I feel like I am missing some necessary steps and considerations when soldering a new DC port back onto a circuit board.

           In closing, I look forward to hearing back from everyone regarding this question.  I am confident there will be much insightful feedback given to this post.

           Thank you.

            George
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Question by:GMartin
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by:PUNKY
PUNKY earned 200 total points
ID: 24767583
"do I simply go ahead and solder the legs of the DC port which protrude through to the back side of the circuit board?". Yes, do that. Ensure that after you soldering the leads of components on bottom side, the solder should be seen on topside of the circuit board (at least solder fill 75% and up the holes).
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by:Rob Hutchinson
Rob Hutchinson earned 400 total points
ID: 24767594
For instance, do I simply go ahead and solder the legs of the DC port which protrude through to the back side of the circuit board?  Or, will I need to apply solder to these legs as well?

Yes, and yes. The holes where the legs fit into are also contact points an no other wires are soldered to these holes.

You will get the hole and pin hot enuf so that the solder melts into place filling the hole locking the socket onto the motherboard.

You might also need to use some flux or use the solder type that has a flux core.

If you have an old videocard you can practice with this board first to get the hang of it.
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Donald Stewart earned 800 total points
ID: 24767710
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by:garycase
garycase earned 600 total points
ID: 24768031
Hi George,

The guide in the link dstewartjr posted does a very good job of outlining the process ... but I'll add a couple of thoughts ...

=> First, a desoldering iron is much better than using a separate pump and iron.   A desoldering iron vacuums directly through the iron itself ... this makes it much easier to do a good job of desoldering.     I believe you've already bought the desoldering tool I suggested in an earlier post, so you're all set for that.

=>  Second, I don't agree with the step "... Apply a fresh coat of solder to all power jack terminals on both sides of the motherboard. " ==>  This will make it "look" nice, but is adding an unnecessary layer of solder that can actually degrade the connection.    While solder is conductive, the purpose of a solder joint is NOT to provide a connection -- it's to hold the connection in place by forming a bond between the connecting elements.

Other than that, it's an excellent guide which should make it very easy for you to do your jack replacement.
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by:GMartin
ID: 24800257
Hi Everyone;

           All the tools suggested from previous post have arrived.  Now that I have everything in place in addtion to the information provided here as well as other previously closed threads, I feel confident everything should go fine.  Speaking of the feedback, I wnat to thank each person for sharing their keen insights, thoughts, and tips.  This information used in conjuction with the clearly oultined steps given by dstewartjr's link will certainly help in getting me through this new task.  

             If I should have other questions or concerns arise, it is comforting knowing I have somewhere to go.  Many thanks again everyone for your help.

             George
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