Step 15: Attach the Chip to the Bottom of the Matrix Board
In this photo, we are looking at the bottom wing of the matrix board. The bottom is the side below LED row #1. The notch on the chip is facing to the left (and again very hard to see in photo).
The holes on the bottom wing of the matrix card have flat slots just below the v-bars that should perfectly accept the pins of the chip and perfectly align them with the waiting V-bars. If not, then just jam it in.
Note the unused hole at the far left of the wing. I'll get rid of that hole in the next version of the matrix board.
Solder the v-bar tips to the chip pins. If some of the v-bar tips are sticking out too far then clip them unceremoniously.