LG MDV902 Service Manual page 57

C
LASER
TURNS ON WHEN
READING DISC?
YES
PUT DISC IN TRAY.
DOES SPINDLE
ROTATE?
YES
D
DVDLD
NO
OR CDLD OUTPUT
PROPERLY?
COLLECTOR
VOLTAGE OF POWER
TRANSISTOR IS OK?
(Q405, Q406)
CHECK CABLE CONNECTION
BETWEEN PDM01 AND
PICK-UP HEAD.
PROPER
NO
SPINDLE SIGNAL
ON ES8381.
SPIN+ &
SPIN- OUTPUT
PROPERLY?
CHECK THE CABLE
CONNECTION BETWEEN
PDM03 AND MD
4-4
NO
YES
NO
YES
NO
YES
NO
YES
CHECK THE LASER POWER
CIRCUIT BETWEEN ES8381
AND POWER TRANSISTOR.
(Q405, Q406)
CHECK THE RELATED
CIRCUIT OF LASER
POWER TRANSISTOR.
CHECK THE SPINDLE
RELATED CIRCUIT ON
ES8381
CHECK THE SPINDLE
CONTROL OF MOTOR
DRIVER (IC404).