So I was out riding my diy board last month when mid acceleration I hear a pop and then there was nothing from my board. Sadly I could not react quickly enough and I feel on my face (quite literally…) Now that my road rash has healed and I’ve had some time to start to forget about the fall I wanted to see what actually broke so I took the cover off the bottom to check the battery and that seems fine. Next I tried plugging in the loop key and I can see the ESC light up, (I thought for sure that was what failed but maybe not how I had imagined it did) when I pull the trigger on the remote I see the signal light blink and I can hear a clicking nose coming from the ESC but the motor does nothing. I’m thinking maybe something else in the ESC broke or maybe the motor is dead? How do I test the ESC and motor to see which is broken? Pic of my board for attention 
what happens if u try to do motor detection?
I didn’t even think to try plugging the ESC into the computer. It’s been 2 years since I built it lol I’ll try that today and report back
If the motor detection doesn’t work you can test the motor with simple Multimeter. Measure the resistance between all three leads in all combinations eg (1-2, 1-2, 1-3, 2-3) they should all read close to the same resistance, (note do this with the motor disconnected from the esc)
If you don’t have or don’t want to buy a multimeter you can get a feel for the motor if you disconnect it completely from the esc and then spin the motor with the leads not touching. If you hold two of them together and then spin the motor you should get some resistance, repeate with all permutations of the leads. If they all feel roughly the same the motor is probably fine.