Your SMOOTH motor controller chip appears to have failed. Assuming the spindle motor is OK, your most expedient solution is to replace the board and transfer the 8-pin serial flash memory chip at U12 from patient to donor. If you have a multimeter, you should test the motor windings. There are three phases plus a common terminal. The phase-to-common resistance should be of the order of 3 ohms. Phase-to-phase should be 6 ohms or thereabouts.
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