LG GWA-4164B Service Manual page 74

Sled operating is abnormal.
Is there Sled
control signal output?
(IC201 pin 68,69)
YES
Is there
Sled drive voltage input?
(IC301 pin 29,30)
YES
Is there
Sled drive voltage output?
(IC301 pin37,38,39,40)
YES
Is there
Sled drive voltage output ?
(CN302 pin 1,2,3,4)
NO
•
Check the Connection CN302.
78
NO
NO
•
Check the R316, R317.
NO
Is DRVMUTE2 signal 'H'?
(IC301 pin 35)
YES
Replace the IC301.
YES
Replace the Sled Motor.
Replace the IC201.
NO
Check the connection of IC121
pin 32.
Replace the IC121.