Reply To: Need a little help troubleshooting…


Looking at the schematic I see that the common thing between “L” and “O” is Row11 which comes from pin14 (one corner) on ht16k33. Row11 is also used for segment “E” on the alnum digits and that segment is the bottom right.
Since both the main and l&k board has issues the first action is to just put a solder iron on pin14 on the ht16k33 chip. I would guess that it’s not soldered properly since looking at the traces they go out from that point in different directions, one to the jumper cable and one to the LEDs on the board.