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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
Testing out the LED matrix (disconnected from MAX7219 driver board) w/ a 5V source and a 470 ...1K Ohm resistor will tell you... and then you do the same with a single LED and the driver board... that will tell you what is broken... or it may just have been a cold soldering point... had those duds when working w/ flip-dots... it just did not want to work, and that's the procedure I used to get to the bottom of the issue.