LG RH4820W Service Manual page 65

Track Servo is unstable
Is TE signal
output normal in focusing
ON and tracking OFF?
(IC107 pin 82)
YES
Is TE signal
input normal in focusing
ON and tracking OFF?
(IC202 pin 139)
YES
Is there TDRV
signal output in tracking ON?
(IC202 pin 147)
YES
Check the IC105 and pick-up referring to
"Focus Actuator operating is abnormal".
NO
(E, F, G, H)output normal?
(CN101 pin 5, 8, 9, 12)
Replace the IC107.
NO
Check the connection between
IC202(pin139)and IC107(pin 82).
NO
3-85
Is pick-up
YES
•Check the pick-up FFC.
•Replace the pick-up.
Replace the IC202.
NO