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LG GWA-4164B Service Manual page 76

Dvd/cd rewritable drive
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Focus Servo is unstable
Is FE signal
output normal in Focusing
Up/Down?
(IC121 pin25*)
YES
Is FDRV signal
output normal in Focusing
Up/Down?
(IC201 pin 62)
YES
Go to "Focus Actuator
operating is abnormal"
Focus Actuator operating is
abnormal
Is there Focus
Search control signal input?
(IC301 pin5)
YES
Is there Focus
Search drive voltage output?
(IC301 pin 51,52)
YES
Check the connection CN101 pin40,41.
Replace the Pick-Up.
80
NO
Check Pickup Read Power
is 1.3~1.7mW?
Replace the IC121.
NO
Replace the IC201.
Check the connection of IC201 pin 62.
NO
Check the communication line between
IC121 and IC201.
Replace the IC201.
NO
Is DRVMUTE2 signal "H"?
(IC301 pin 35)
YES
Replace the IC301.
NO
Replace the Pick up.
* IC121 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 IC121 pin 32.
Replace the IC121.

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