I have 484 enemies…
Solder balls, 0.55mm diameter.
Just testing my first 4 layer PCB with some second hand FPGA chips.
I am using old solder paste to build new balls… but with bad result. Two pins are missing (from used).
From left to right: from solder paste, using lead balls, original from factory.
Ahoy, there is problem with left chip and no problems with right chip. Same chip, but different package.
