Hi! I have MAX7219 and I controlled matrix and 7 segment display with it and everything worked good. Last week I saw big bug. Some leds on matrix are constantly ON, and 7 segment display won't turn on any segment. I bought new marix module with new ic max7219, and nothing has changed, also I replaced arduino mcu and things are same.
Please tell me what causes that and how I can fix that. I am searching for topics on forums about same problem but i didn't found answer.
Sorry for my bad English.