LG 42PC51 Service Manual page 19

5. In the case of an unusual display in rear AV mode.
Is video input of
the A/V jack normal?
(Check R172)
Yes
Sam as Block A
6. In the case of an unusual display in Side AV mode.
Is the video input
of the A/V jack normal?
(Check CN703
Pin9)
Yes
Sam as Block A
7. In the case of an unusual display in Side S-Video mode.
Is the video input
of the A/V jack normal?
(Check CN703 Pin1,
Pin3)
Yes
Sam as Block A
No
Check the input source.
No
Check the input source.
No
Check the input source.
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