That board is the spindle board. The connector is the enable and is being used to signal E-stop occured. The pins could just be jumped and it would work.

If your 100% sure BOB is getting signals then start by making sure power is getting to the Bob.
The schematic shows that the E-stop controls a relay which provides 12v to power the BOB and the spindle board. The E-stop on the BOB is just shorted to Gnd and isn't actually used thru a E-Stop button.

This is a simple BOB and should work if provided with power and signals. Nothing else external controls it's functions ie: enable, charge pump etc.
If its getting power/signals and your pin settings are correct then it will work. So if it's not then call it dead and move on.


Sent from my SM-T580 using Tapatalk