Samsung ww90t4540ax/eu machine won't spin

[Typr345]

Hello, 

I have a Samsung washing machine and yesterday it decided it no longer wants to run a cycle.

It sounds like it's trying to get going but makes a small almost straining noise and runs a sequence again. It does this on loop until I turn it off and the mains.

I tried running diagnostic but I just get -: as a display. I'm guessing I'm doing something wrong here? I turn the machine off, and turn it back on again holding whilst the third and fourth button from left down. 

When I try and turn the drum it has resistance and almost jitters as I turn it. However, if I disconnect the motor from the PCB the drum and motor turn smoothly again. Plug the connector back into the motor, and I get resistance again. Even with mains power turned off.

Any help or guidance on this would be greatly appreciated.

[Whitegoodshelp]

Hi. Is the tension created by the belt causing the motor or drum to catch on something? Is there any play in the shaft of either?