LG LGXBR342 Service Manual page 78

Spindle operating is abnormal
Is there
spindle control signal input?
(IC105 pin 24)
YES
Is there
spindle drive voltage output?
(IC105 pin 9,11,18)
YES
Replace the Spindle Motor
NO
spindle control DSP
output(IC202 pin 145)?
•Check the R147,R149.
•Replace the IC106
NO
SFG signal input?
•Check the connection of IC105 pin 21.
•Check the connector CN103.
•Replace the IC105.
3-102
Is there
YES
Replace the IC202.
Is there
(IC302 pin 28)
YES
OK
NO
NO