Read LG 42LY99-ZC (CHASSIS:LD75C) Service Manual online
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4-2. In case of does't display the screen into specific mode
(1) Symptom
- There is no screen display from specific input mode.
(RF, AV, Component, RGB, DVI).
(2) Check following
1) Check the all input modes have normal display.
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) have normal display from
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) have normal display from
the PIP mode or DW mode. (Re-Check it Swap)
(3) In case of becomes unusual display from RF mode
Is the Tuner
normal?
Is the Input voltage, IIC Communication
and CVBS output normal?
and CVBS output normal?
Replace the Tuner.
Is the Tuner Cable
connected?
Re- inserts the cable.
Yes
No
No
No
Yes
Is the CXA2069Q
normal?
Replace the IC.
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Yes
No
No
Replace the IC.
No
Is the FIL8548
normal?
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
No
Block A
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