LG 42PG20D Service Manual page 17

(5) In the case of becomes unusual display from Component, RGB mode
Is the R,G,B input and H,V
Sync of the JK104 normal?
Yes
Same as Block A
(6) In the case of becomes unusual display from HDMI mode
Is the HDMI(IC201)
normal?
Yes
Same as Block A
(7) In the case of becomes unusual display from component mode
Is the Video input of
component jack normal?
Yes
Same as Block A
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No
Check the input source
No
Is the TMDS waveform between the
IC and HDMI jacks normal?
No
Check the input source
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No
Replace the IC201.
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