Re: Inexpensive hot-air tools (was: Re: [QRPLabs] looking for technics to replacing the IC4 FST3253
Shirley Dulcey KE1L
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That works just fine for the parts it's designed for, and a METCAL is the top of the line for conventional soldering equipment. It's more than most ham builders need, but use it if you've got it!
But it's useless for soldering BGA parts unless METCAL has a plate that covers the entire top surface of a chip. Even then, hot spots might be an issue. The solder points are UNDER the chip, so there is no way to get to them with conventional soldering iron techniques.
My understanding is that if reflowing the entire board is not possible, as it is not if the board has components on both sides or heat-sensitive parts such as plastic-body trimmers have been added after the original primary soldering, the best technique for handling BGA parts is a hot air station combined with a preheater for the underside of the board. I haven't attempted it -- too challenging for me!
Fortunately for us, QRP Labs kits do not contain any BGA components or any other similarly impossible packages.
On Mon, Nov 9, 2020 at 4:35 PM Mel Farrer via groups.io <email@example.com> wrote: