The MCU (inverter) is part of the motor on these. Changing it isn't hard but it isn't cheap either. However since the motor clearly works to some degree that makes that diagnosis a little more iffy. CCU/MCU problems are a constant nuisance for all of us who work on these things.
With the motor action you see I lean toward the CCU because I've changed more CCUs than MCUs on these but anything is possible. The two CPUs talk to each other through out the cycle so it could be either part or even a wiring issue.
You can try the standard test for these issues first but it isn't definitive really.
Hopefully your dryer isn't stacked on top of the washer.
1)Unplug the washer and remove the top panel. Screws (3) are along back edge. Panel slides back to remove.
2)Locate CCU at right front corner. It'll be the gray plastic thing with alot of blue and pink wires plugged in.
3)Look for the MI3 connector. It will be a white connector with 3 blue wires. You'll see the "MI3" molded in the plastic of the CCU case if you look carefully That feeds instructions to the MCU down on the motor. I think it is on the top edge but don't quote me. Look along rear edge first. If it is up top you'll probably need to dismount CCU to open the cover. There is a little tab that engages the metal frame near back of CCU.
4) Plug power cord back in
5)Try to start a wash cycle.
Report the results back here.
Also do you have access to a multimeter to electrical testing?
For reference here are the MCU and CCU. These guys allow returns on electrical parts which is great for problems like yours.
Anyone else with ideas please jump in!