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Jumpering Optocouplers does indeed not improve functionallity. I ended up doing so though because I used the Optocouplers from the board to properly isolate the input (PC) from the Stepper driver....

Did you invert the enable Signal? It needs to be set as low to disable steppers, high to enable them. I didn't do that the first time i tried my board and had the same problem.

Also the mod's...

Replacing C25, C26, C27 [marked in orange] (Below the heatsink connected to pin 7 - OSC and Ground) and desoldering "the current saving feature" R55, R60, R61 [marked in red] (between heatsink and...

I'm taking care of that with a selfmade opticaly isolated arduino shield (I'm using arduino and grbl)

C25, C26, C27 (Below the heatsink connected to pin 7 - OSC and Ground) should be the caps that...

I got myself the "newest" edition of this board (chinese blue tb6560 3 Axis). The same one Jamb00 and jmp2014 got.

245532
245534
245536

There are now no smd or other components mounted on the...