LG RH1757 Service Manual page 67

Spindle operating is abnormal
Is there
Spindle control DSP output?
(LIC201 pin70)
YES
Is there
Spindle drive voltage output?
(LIC301 pin 11, 13, 16)
YES
Is there
Spindle drive voltage output?
(LIC301 pin 1, 2, 3)
NO
Check the Connection LPM301.
NO
Replace the LIC201.
NO
Is there
FG signal input?
(LIC201 pin 71)
YES
OK
YES
Replace the Spindle Motor.
4-6
NO
Check the output of LIC301 pin 43.
Check the connector LPM301.
Replace the LIC301.