I have a matrix - the SEY2344NK 10A SENIOR model - and it has some strange connections. I was looking for the datasheet but it simply isn't coming up in Google. Anyone knows about it and its connections? Wiring to a MAX7219?
Perhaps if you posted detailed images of the front and back of the 'matrix' someone might recognize it. The part number SEY2344NK doesn't show up at all in a Google search. The NK part might be for Shenzhen Nick Optoelectronic Technology Co.,Ltd
I dare say you will have to just sit there with a 5 or 6V power source (Arduino?), a 330 ohm resistor in series with a couple of "wander" leads with which you probe the pins and annotate a diagram to make out which correspond to which LED lighting.
As a hint however, note the number of pins in the two rows, and the dimensions of the array (such as 8 by 8 or 5 by 7 or whatever) and look up diagrams for pinouts of similar arrays and see if they match to your probings.