LG RH1777 Service Manual page 67

Sled operating i s abnormal.
Is there Sled
control signal output?
(LIC201 pin 68,69)
YES
Is there
Sled drive voltage input?
(LIC301 pin 29,30)
YES
Is there
Sled drive voltage output?
(LIC301 pin37,38,39,40)
YES
Is there
Sled drive voltage output ?
(LPM302 pin 1,2,3,4)
NO
Check the Connection LCN302.
NO
NO
Check the LR316, LR317.
NO
Is DRVMUTE2 signal 'H'?
(LIC301 pin 35)
YES
Replace the LIC301.
YES
Replace the Sled Motor.
4-5
Replace the LIC201.
NO
Check the connection of LIC121
pin 32.
Replace the LIC121.