LG 42PG3000 Service Manual page 21

5-2. In case of does't display the screen into specific mode
(1) Symptom
1) The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check following
1) Check the all input mode should become normality display.
(3) In case of becomes unusual display from RF mode
Is the Tuner normal?
Yes
Block A
Is the IC100(LGE7383C)
normal?
(4) In the case of becomes unusual display from side S-video/AV mode
Is the Video input of the AV
Jack(JK700, 707)normal?
Yes
Same as Block A
(5) In the case of becomes unusual display from Component, RGB mode
Is theR,G,B input and H,V Sync
of the JK701,703 normal?
Yes
Same as Block A
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Only for training and service purposes
No
Is the Tuner Cable connected?
No
Re-insert the Cable.
No
Is normal the Input voltage, IIC
Communication?
No
Check the input source and Cable
No
Check the input source
Yes
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Is the Input voltage, IIC Communication
and CVBS output normal?
Replace the Tuner.
No
Replace the IC.
LGE Internal Use Only
No