LG 42PC55 Service Manual page 24

5. In case of occurring strange screen into specific mode
5-1. In case the OSD does not displayed
(1) Symptom
1) LED is green.
2) The minute discharged continuously becomes Accomplished from module.
(2) Check following
Is the LVDS cable
normal ?
Yes
Is the VSC Board
normal?
Yes
Is the Ctrl Board of
Module normal?
No
Is the LVDS cable
connected well?
No
Cable inserts well.
No
Does the FIL8548
IC(IC700) Operates ?
No
Replace FIL8548
IC(IC700)
No
Replace Ctrl B/D.
Yes
Replace the cable.
Yes
Replace the VSC B/D