Connections on DC Jack will not Desolder

Hewlett-packard Pavilion dv4-2045dx note...
April 23, 2013 at 11:02:57
Specs: Windows 7, A8-5600K / 16GB RAM
I have a Gateway MA7 Laptop with a bad DC Jack. I need to replace it. I took the whole thing apart, and attempted what SHOULD be the simple task of desoldering 5 points to remove the existing jack. However, the Solder will NOT melt. I am using Desoldering braid and a 40W Iron. I was told anything more powerful runs a risk of damaging the board. However, I have held the Iron and Braid to connections for up to 2 minutes and they will STILL not melt. What gives? What am I doing wrong???

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April 23, 2013 at 12:25:55
When in doubt, add flux? I find most soldering problems are solved with more flux, more solder, or more solder wick.

Feel free to use a larger iron if you got one; it's a power plug, not a chip. I'm assuming it's not surface mount, so you might be able to cut off the old plug and work on the pins individually, just don't damage the MB.

I joked about adding more solder, but sometimes fresh solder can help remove the old.

Also, make sure the iron's getting hot enough. I don't know how much experience you have with soldering, but leaving the iron touching for 2 minutes probably doesn't do much past the first 30 seconds. I don't have a lot of soldering experience myself, but I tend to work in <10 second increments.

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April 23, 2013 at 12:38:27
Make sure that your iron is clean and tinned.

See in the video how the tip is all sliver, because it is tinned. If your tip is black and solder doesn't stick to it, you should replace the tip. If you want to try to use it, get a razor and gently scrap the tip, try to get solder to stick, clean with sponge, repeat until solder is sticking to the tip all the way around.

I have found with DC jacks that you don't want to try to wick up all the solder on the jack to get the jack out. You want to add solder, get all the mount points melted at once and pull the jack out with pliers. Then go back and wick up all the solder from the mounting points.

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April 23, 2013 at 13:42:31
Another tip if you suspect the iron is not getting hot enough.

Loosen and tighten the tip a couple times...corrosion can build up and prevent good heat transfer between the iron and tip.

Audares Juvo

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April 23, 2013 at 15:14:34
Hi Xfile, suggest you take local professional advice on this as:-

a) sometimes an extra hot soldering iron is required to remove and replace these sockets, as special high temperature solder may have been used.
You wiull probably need a de-soldering tool when the old solder eventually melts.

b) sometimes the socket is soldered into a layered board, so one needs to know what one is doing.

Please advise back on progress.

Good Luck - Keep us posted.

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