Problem with China clone Ultimaker 2 2.1.4 (max current)

I hade a problem with my verry verry cheap China clone Ultimaker board Ver. 2.1.4
The stepper of the Z axis and all the other axis worked but they had no torque.
After a long search I found the reason.
The current sense resistance are wrong, it should be 0.05 Ohm and mounted are 0.5 Ohm. First I thought that my mechanic was to strong so I decide to a test and connected an external stepper driver on the testpins and the mechanic is not the problem. In the video you can see my test and I added 2 pictures 1 from the wrong resistor and the other ist the schematics of the driver.

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CNC control

I presented in a old post the parts of the CNC control. I use 2 stepper driver for the y axis an one for the x and z axis. I mounted the breakout board on the MDF panel but I didn’t use it, it’s only to know where it is. For the control of the CNC I choose Estlcam. It work like GRBL and need a Arduino uno for the control, so I connect the Arduino directly to  the drivers. Between the driver I installed an old CPU fan to cool the driver. I don’t know if the fan is necessary. Here a few pictures on the control.

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