ELEKTOR FORUMS

Has anybody got some surface mount soldering techniques

The first way I was taught to replace surface mount parts some years ago (like 10 years ago).

How to replace surface mount parts.
(1) Take off the old part,
(2) Simultaneously heating and rubbing tined copper braid known as solder braid using a standard hot iron to soak up any old solder,
(3) Clean up tracks with isopropyl alcohol and tooth brush,
(4) Then apply a thin trace of solder paste over the copper tracks from a small syringe of paste,
(5) Then put the surface mount IC on top and blow hot air over it until the paste melts and solders the part in place.

WARNING
One problem when you take off a part for the first time some people make is they pull too hard and the tracks come away
THE PARTS ARE NOT HEAVY you just need the tiniest effort to remove the part when the solder has melted.



One of the disadvantage of using hot air is some times you can easily "blow off" other nearby components.
and found that one idea might be to use "solder paste & soldering iron"

Interesting that is not what I read in Elektor magazine a few months ago, or what I found on the web via google, and then there are the jokers at work who never did any electronics training and they "know everything"

There was a question was going to appear on part two posting on trying to find a suitable syringe to fill with paste,
but due to the long response time the question has gone away.

Only suggestions to soldering or desoldering chips is to not solder consecutive leads. This can lead to overheating & damaging the chip. Whenever possible stagger pins & sides of the chip to allow heat to go dissipate rather than keep build.

Gold Contact Repair Kit