Sudden lost of Y2 slave control

Hi all;

My question is simple. No changes have been made to wiring or configuration, yet Y2 stopped working. I verified connectivity between the motor and the breakout board, all is good. I next tried swapping the plug position between my A axis and the Y2 axis, modified the hal file to reflect the swap and restarted LCNC. Now the X axis has joined the problem. Z still responds correctly.
What is more likely, a failure of my MESA 7i76U driver board or the breakout board or both?

Kind Regards,

My crystal ball has stopped working....
More info, pictures, configs...

On a 7I76U, if any of the 0..3 stepgen STEP or DIR outputs on TB2  have been
damaged, all 4 may be affected as they are driven by the same chips.
(U8 = 74ACT540  for the - outputs and U12 = 74ACT541 for the + outputs)

Thanks PCW;
Would it be more cost effective to replace the board or have it repaired?

Kind Regards,

You might do a simple output voltage check with no load to make sure the issue is with the 7I76U card

All  step/dir outputs should measure very close to 5V or 0V. nay on between voltages suggest a damaged
output driver chip

Mesa can repair the card for a nominal charge but shipping will add up.

Good morninig PCW;

Checked the voltages at the micro-stepper plugs this morning, all read either 0 v or 4.12 v, nothing in between. Although the high voltage is a bit low, I think it is within operational range. I'm not using an external 5 v supply for the board, though I have one to run my crosshair laser, so I could tap that supply if necessary. All of my dedicated power supplies 5, 12, 24 and 36 v are spot on their output voltages.

Not sure if it is the 7i76U or the 6i25 FPGA, which is configured as a 5i25, in the computer or something else that could be the issue. What is your suggestion at this point?