Lost DIR control on X axis

Hi,

I'm running a prusa mendel with RAMPS 1.4.

During a print, my x-axis started acting up amd offset mid-print.

Now I no longer have DIR control on my x-axis
Pos and Neg move in the same direction.

I thought it was the stepper motor controller chip, but it is not
I've swapped the chips into various spots. Everything else always works fine and the X axis always has this issue.

Everything else on the machine seems to be working correctly.

Anyone have any ideas on how to fix this?

Thanks!
Steve

Had a similar problem in the post. Was a broken wire for the stepper

I thought about that. But when I connect that motor to the terminal for.a different axis it works fine

Is the end stop for that axis functioning correctly? Are you using Ramps, and if so, have you checked that the pin that connects the addition to the ramps board is making good contact? You should be able to probe the DIR pin on the stepper, the ramps board and he radii no and see where it is failing.

I am using a ramps 1.4. The connection between the dir on the stepper controller and board seems good. I've also tried several stepper controllers

Im fairly new to electronics, so I'm sure sure of the exact process of probing the pin to find the fail point.
Can you suggest a resouce that might contain those steps?

Also, the X axis end stop appears to be working correctly.

Cold solder joint on the ramps board to the connectors for the X-Axis stepper stick socket?