How to check if A4988 is fried?

Support Motor controllers/drivers and motors
23

We have made a basic A4988 and DRV8825 tester
https://www.ebay.com/itm/164517721643

24

HI, everyone i bought four A4988 driver board insert it into cnc shield and i adjust the voltage REV for the motor and i discover later that one the driver voltage reverence adjuster did not respond if i began to turning it the voltage rev and the voltage keep remain 0.001,what can i do to it

25

Hello.

Just to confirm, it sounds like all of your drivers were working at some point, and now on one of the drivers is not working and VREF will not adjust when you turn the potentiometer; is that correct?

Can you post some pictures of your drivers and your setup, including ones that show all of your soldered connections and how you are measuring VREF?

- Patrick