Today after I took 4th covid vax jab. I can't move much since my arm hurts xD. So I decided to revisit this project after I've been working on oscilloscope project and before I go back to Bangkok (Uni) soon.

Jump to the pinout. I already found the LED pinout of this keyboard. It turned out that each row (1-3) has its own LEDs. They share cathode (-) on same row. So pin 20, 21 and 24 are LED cathode pin for row number 1 2 and 3. These LEDs separated anode (+) pin. Pin 7 is for left side and pin 22 is for right side.  So the configuration is something like this :