LG RH7521W Service Manual page 74

Focus Servo is unstable
Is FE signal
output normal in Focusing
Up/Down?
(LIC201 pin 87)
Is FDRV signal
output normal in Focusing
Up/Down?
(LIC301 pin 124)
Go to "Focus Actuator
operating is abnormal"
Focus Actuator operating is abnormal.
Is there focus
search control signal input?
(LIC502 pin 5)
Is there focus
search drive voltage output?
(LIC502 pin 51,52)
•Check the connection CN102 pin 40,41.
•Check the connector LCN201.
Replace the pick-up. After replacing Perform
5. Optical Power Setting from 'How to use Test tool'.
NO
YES
NO
YES
NO
YES
NO
YES
Replace the LIC201.
•Check the R534.
•Replace the LIC201.
• Check the connection of LIC301 pin 124.
• Check the communication line between
LIC205 and LIC301.
• Replace the LIC205.
Is DRV-CTRL1
signal "H"?
(LIC502 pin 35)
YES
Replace the LIC502.
• Replace the IC301.
NO