LG RH1777 Service Manual page 69

Focus Servo is unstable
Is FE signal
output normal in Focusing
Up/Down?
(LIC121 pin25*)
YES
Is FDRV signal
output normal in Focusing
Up/Down?
(LIC201 pin 62)
YES
Go to "Focus Actuator
operating is abnormal"
Focus Actuator operating is
abnormal
Is there Focus
Search control signal input?
(LIC301 pin5)
YES
Is there Focus
Search drive voltage output?
(LIC301 pin 51,52)
YES
Check the connection
LPM101 pin40, 41.
Replace the Pick-Up.
NO
Check Pickup Read Power
is 1.3~1.7mW?
Replace the LIC121.
NO
Replace the LIC201.
Check the connection of LIC201 pin 62.
•
NO
Check the communication line between
•
LIC121 and LIC201.
Replace the LIC201.
•
NO
Is DRVMUTE2 signal "H"?
(LIC301 pin 35)
YES
Replace the LIC301.
4-7
NO
Replace the Pick up.
* LIC121 pin25 is MOUT2(FEP Monitor2).
After disc recognition action, Monitor port
is off. So, please check FE signal during
disc recognition.
NO
Check the connection of LIC121 pin 32.
Replace the LIC121.