Dvd not spinning properly

The disc will not spion until the optics realize that a disc is there. Try cleaning the lens using a cotton swab and alcohol. If that fails, then the optics are at fault and need to be replaced. It is possible that the spindle motor (one that spins the disk) is faulty. Unfortunately, that is not a part that is available from Sony. Because of the way the whole optics assembly is built and alignd, this part is not a replaceable part. Try playing a CD. If the CD plays but the DVD does not, that indicates that the optics are failing as the DVD requires more laser power to function properly.
Dan

Take it to the aurthorised sony service center may be the lense require tuning on the preset or needs to be replaced.

Unfortunately, it sounds like this unit needs a new stepper motor.