42PG3000-ZA (CHASSIS:PD83A) - LG TV Service Manual (repair manual). Page 21

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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
(4) In the case of becomes unusual display from side S-video/AV mode
(5) In the case of becomes unusual display from Component, RGB mode
Is the Tuner normal?
Is the Tuner Cable connected?
Re-insert the Cable.
Yes
No
No
Is the IC100(LGE7383C)
normal?
Replace the Tuner.
No
Is the Input voltage, IIC Communication
and CVBS output normal?
Yes
Is normal the Input voltage, IIC
Communication?
No
Block A
Replace the IC.
No
Is the Video input of the AV
Jack(JK700, 707)normal?
Yes
Check the input source and Cable
No
Same as Block A
Is theR,G,B input and H,V Sync
of the JK701,703 normal?
Check the input source
No
Yes
Same as Block A
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