Hello,
I need some advice on how to rework sensitive SMT parts that are very close to other sensitive SMT parts.
(Attachment Link)
As you can see in the picture, this inductor is surrounded by electrolytics. I tried to solder this inductor to the board with solder paste and a heat gun, but one of the caps blew up.
My question is how can I rework a component without overheating the components right next to it?? What is the technique/strategy?
Thanks!
FYI, going by the picture, you way, way overheated those parts. Like, not just a little bit. You can see that from the black bubbling on the inductor, the melted plastic bases of the caps, etc.
Inductors are a pain, due to their huge thermal mass. You need some combination of a heat shield, heat from below, or do a much longer “presoak” at a moderate temperature, so that you only need a comparatively short blast of higher heat to get to a melt. My guess is you have a huge ground plane there too, so that not just the inductor’s mass is coming into play. This really speaks for using a generous presoak and heating from below. Then go in with an iron from above to actually solder the thing down.
P.S. At this point, you must consider all of those caps as having been wildly overheated, so you must replace them. I’d remove them, deal with the inductor, and then install the replacements.