LG 42PC51 Service Manual page 21

11. In the case of an unusual display in component 1 mode.
Is the video
input of the A/V jack
normal? (Check R248,
R249,R250)
Yes
Change IC(IC500)
12. In the case of an unusual display in component 2 mode.
Is the video
input of the A/V Jk202
normal? (Check R241,
R242, R243)
Yes
Change IC(IC500)
13. In the case of an unusual display in RGB mode.
Is the
R, G, B input
and H, V sync of the
JK201 normal?(Check R220,
R221, R253, R254,
R255)
Yes
Change IC(IC500)
No
Check the input source.
No
Check the input source.
No
Check the input source.
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