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From: "Stephen Ecob (stephen DOT ecob AT sioi DOT com DOT au) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Wed, 28 Jun 2017 08:24:08 +1000
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Subject: Re: [geda-user] Cheapest solution for 100 pin tqfp processor
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Precedence: bulk

I routinely hand solder 0.5mm pitch 144 pin TQFP FPGAs.  Excellent
flux is essential - I use Electrolube SMFL aerosol flux with a
dispenser tube.  My procedure is:

1. place the part and solder two corner pins
2. check alignment with a USB microscope, adjust as necessary
3. spray plenty of SMFL
4. with a fine tipped iron and good quality 60/40 solder form a small
solder ball and drag it along a row of pins.
5. repeat step 4 for the other sides
6. clean up shorts with copper solder wick and more SMFL
7. clean up flux with IPA
8. check for dry joints and tiny shorts with a pin and USB microscope.
Fix with SMFL, solder and solder wick as required.
9. final clean with IPA

Stephen Ecob
Silicon On Inspiration
Sydney Australia
www.sioi.com.au