LG 42LF66 Service Manual page 22

4. In case of occur strange screen into specific mode
1) In case of does't display the OSD
(1) Symptom
1) LED is green.
2) The minute discharge continuously becomes accomplished from module
(2) Check follow
Is normal the LVDS
cable?
Yes
Is normal the VSC
Board?
Yes
Is normal the Ctrl
Board of Module?
No
Is the LVDS cable connected well?
Cable inserts well.
No
Operates the FIL8548 IC(IC700)?
Replace FIL8548 IC(IC700).
No
Replace Ctrl B/D.
Yes
No
Yes
No
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Replace Power Board.
Replace VSC B/D