I have NO IDEA if this is L7 board! If not, please move the topic accordinhgy, thanks!
So I bought my laser from Banggood on Sep 2016.
It worked nicely until couple months ago when it basically sat on my bench for a while and when I tried to do some light lasering wouldn't move motors anymore. So I just said fudge it and ordered EleksMaker Mana SE board and it arrived and everythings fine and dandy. But I have 'half working' controller board and was wondering if I could fix it and use it to build other machine.
Image of the board is attached.
The arduino nano board is working.
1 of the stepper motor controllers was not working as when it was attached to whole board my computer didn't recognize arduino. I changed 'new' controllers and then computer recognizes the arduino. But now the motors won't run and I can't turn on the laser from any software. Weak laser button ligths the laser properly.
So I was wondering if somebody knows what might be wrong with the board and if it's fixable. I can do some soldering but I really don't have any idea how electronics actually work, I just plug things in and most times they work

Also have multimeter so can make some measurements if needed.
EDIT: forgot to attach the image, d'oh!