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Post by Casethecorvetteman on Mar 10, 2016 11:19:50 GMT -5
Hi all, ive now got a few items with reasonably fine pitch chips that may need their solder joints going over.
Some of these items tend to go bad after warming up, and others come good when they warm up.
What is the best and easiest way to reflow these joints without doing any damage?
On some items in the past ive just hit them with the hot air gun set on a lower air speed and around 300°C, but these items im looking at here dont really have enough solder on some of the legs.
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Post by mastertech on Mar 11, 2016 13:32:57 GMT -5
What I usually do is I have a cheap soldering iron, something like from radio shack with a narrow tip. I then file the tip to a sharp point. I then put it on each pin with slight pressure and watch for the solder to melt or change color and then slightly more pressure and drag it down that pin. Iron I use is 30 watt. Even though it appears to be not much solder it should still be enough to reattach a broken connection. Hot air will not do what is needed because no pressure is being applied to the pins.
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Post by gregstv on Mar 11, 2016 16:46:56 GMT -5
Also use a tiny bit of thin resin core solder. This will add a bit of flux and help the joint reflow. With the age of the boards the solder is dry and needs a bit of flux. When you are done clean with IPA. I use a pressure pack of IPA from J-Car and a small brush. When your finished it should look like new. If there are heavy ground planes you will find warming the board up will help a lot.
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Post by Casethecorvetteman on Mar 11, 2016 23:08:21 GMT -5
Thanks blokes.
I watched some videos they used a flat tip and dragged it straight over the pins using a flux pen etc.
They made it look very easy!!
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