I have a LED Matrix just like this one
but couldn't find the data sheet for it (1855AS) I asked around in my country and one guy told me to try attaching one side to 5v and the other to GND. Some LEDs worked fine and others didn't light up at all. In the end one if not more got burned.
So I'm here asking if anyone can tell me a way to figure out how it works. I would appreciate the help!