LG 32LC7D Service Manual page 19

5-2. In case there is no display on the screen in specific modes
(1) Symptom
1) There is no screen display from a specific input mode
(RF, AV, Component, RGB, DVI).
(2) Procedure check
1) Check the all input modes have normal display.
2) Check the video(main)/ data(sub), video(main)/ video(sub) have normal
displays from the PIP mode or DW mode(re-check it/ swap).
(3) In case of an unusual display in RF mode
Is the Tuner normal?
Yes
Is the CXA2069Q normal?
Yes
Block A
Is the FIL8548 normal?
(4) In case of an unusual display in side S-video/ AV mode
Is the Video input of the AV
Jack(P1400) normal?
Yes
Is the CXA2069Q normal?
Yes
Same as Block A
No
Is the Tuner Cable connected?
No
Re-insert the cable
No
Are the Input voltage, IIC
Communication and HV sync normal?
No
Are the input voltage, IIC
Communication and HV sync normal?
No
Check the input source
No
Are the Input voltage, IIC
Communication and HV sync normal?
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Yes
Are the Input voltage, IIC Communication
and CVBS output normal?
Replace the Tuner.
No
Replace the IC.
No
Replace the IC.
No
Replace the IC.
No