Really quick question. I'm working with 8x8 LED matrix made by Sure electronics (LE-MM103).
In LED or any other diode current flows from anode (positive) to cathode (negative), right?
So according to datasheet (I'm attaching screenshot) if I want to light up green LED in Row1, Col1 I need to connect + to pin 22, and negative to pin 24.
Well in reality it's opposite, it lights up when I connect it in reverse. Did I misread the matrix picture or it's just plain wrong?
Wellcome to real electronics. It is possible to have errors in datasheets. Reputable manufacturers have less and others more. Or if there several customers before you, it is more probable that errors are found and corrected before you notice them. Some vendors could not care less.
Have you tried to contact the seller?
LMI:
Wellcome to real electronics. It is possible to have errors in datasheets. Reputable manufacturers have less and others more. Or if there several customers before you, it is more probable that errors are found and corrected before you notice them. Some vendors could not care less.Have you tried to contact the seller?
Yeah I'll give them a shout. I spoke to Sure Electronics previously about other issues, and it's a little difficult to communicate with them, as you see "A" in the datasheet, "B" in reality but they insist is should be "C" 
It is more likely that you are misreading the orientation of the pins and the data sheet is in fact correct. It is just the pins you are using are not the pins you thing they are using.
Don't know about "C" but in these displays the "A" and "B" refer to inverse polarity versions, so if you are looking at the "A" datasheet and have a "B" device, that would exactly explain it.
Ok I wish I never mentioned abc stuff, it has nothing to do with my question. I simply wanted to know according to the image that I attached and pins configurations I mentioned, who is wrong: me or that schematic? 
If you saw that image and wanted to light up led in row 1, col 1, how would you wire it polarity wise?
bratan:
If you saw that image and wanted to light up led in row 1, col 1, how would you wire it polarity wise?
I would wire it as you did in your initial post. Assuming that wiring it backwards to work holds true for several other examples (say all 4 corners) then the datasheet is wrong (or the wrong datasheet)or the matrix is wrong.
Riva:
I would wire it as you did in your initial post. Assuming that wiring it backwards to work holds true for several other examples (say all 4 corners) then the datasheet is wrong (or the wrong datasheet)or the matrix is wrong.https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Components/LED/YSM-1288CR3G2C2.pdf
Thank you! So I'm not crazy! I will contact manufacturer and let them know again. So far they have no idea what I'm talking about 
here's reply I got from them.
We feel sorry for that the item is cathode in introduction and the item you received is anode.
Hope that you can understand.
Could you please kindly tell us that you need cathode or anode?
I think the reply means that they're sorry you have instructions for the common cathode version but have a common anode one at hand; they seem to have both available and they want you to tell them which version you prefer.
JimboZA:
I think the reply means that they're sorry you have instructions for the common cathode version but have a common anode one at hand; they seem to have both available and they want you to tell them which version you prefer.
That might be it Datasheet doesn't distinguish tho...
JimboZA:
I think the reply means that they're sorry you have instructions for the common cathode version but have a common anode one at hand; they seem to have both available and they want you to tell them which version you prefer.
That's what I was getting at as this is generally the case for these displays; they have "A" and "B" version with opposite polarity, but there seems to be only one version of the datasheet for this particular display number for this particular manufacturer, so it remains a puzzle.
bratan:
Datasheet doesn't distinguish tho...
Often get the impression that the datasheet gets done in a hurry at that "Oh crap, we didn't do the datasheet!" moment....
Just wanted to drop a quick note. They sent me new LEDs and I did get them, and surprise surprise they are common anode! Same exact model number tho