LG RH4820W Service Manual page 64

Focus Servo is unstable
Is FE signal
output normal in Focusing
Up/Down?
(IC107 pin 86)
YES
Is FDRV signal
output normal in Focusing
Up/Down?
(IC202 pin 146)
YES
Go to "Focus Actuator
operating is abnormal"
Focus Actuator operating is abnormal.
Is there focus
search control signal input?
(IC105 pin 53)
YES
Is there focus
search drive voltage output?
(IC105 pin 45,46)
YES
•Check the connection CN101 pin 35,36.
•Check the connector CN101.
Replace the pick-up.
NO
NO
• Check the connection of IC202 pin 146.
NO
• Check the communication line between
IC106 and IC202.
• Replace the IC106.
Is DRV-CTRL1
NO
Replace the IC105.
• Check the connection of IC302.
• Replace the IC302.
3-84
Replace the IC107.
•Check the R158.
•Replace the IC107.
signal "H"?
(IC105 pin 23)
YES
NO