LG LGXBR342 Service Manual page 77

Sled operating is abnormal
Is there sled
control signal output?
(IC103 pin 8,9)
YES
Is there
sled drive signal input?
(IC105 pin 28,29)
YES
Is there
sled drive voltage output?
(IC105 pin 34~37)
YES
Is there
sled drive voltage output?
(CN102 pin 1,2,3,4)
NO
Check the connection CN102.
NO
Replace the IC103
•Check the connection of IC105 pin 28,29.
NO
•Replace the IC105.
•Check the R132,R133.
NO
Replace the IC105
•Check the connection of IC302 pin 91.
•Replace the IC302.
YES
Replace the sled motor.
3-101
Is DRV-CTRL1
signal "H"?
(IC105 pin23)
YES
NO