LG 42LF66-ZE Service Manual page 23

2) In case of does't display the screen into specific mode
(1) Symptom
- The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check follow
(1) Check the all input mode should become normality display.
(1) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become
normality display from the PIP mode or DW mode. (Re-Check it Swap)
(3) In case of becomes unusual display from RF mode
Is normal the
Tuner?
Yes
Is normal the
CXA2069Q?
Yes
Block A
Is normal the
FIL8548?
No
Is the Tuner Cable
connected well?
No
Cable inserts well.
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Is normal the Input voltage, IIC
Communication and HV sync?
Yes
Is normal the Input voltage, IIC
Communication and CVBS output?
Yes
Yes
- 23 -
No
Replace Tuner
Replace IC
Replace IC