LG 42PT81 Service Manual page 20

6. In the case of an unusual display in rear S-Video mode(Main).
No
Is the video input
Check the input source.
of the A/V jack normal?
Yes
Sam as Block A
7. In the case of an unusual display in Side AV mode(Main).
No
Is the video input
Check the input source.
of the A/V jack normal?
Yes
Sam as Block A
8. In the case of an unusual display in Side S-Video mode(main).
Is the video
No
input of the A/V jack
Check the input source.
normal? (Check R339,
R341,L310)
Yes
Sam as Block A
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