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42LC41 (CHASSIS:LP78A) - LG TV Service Manual (repair manual). Page 21

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5. In case of becomes unusual display from rear AV mode.
Is video input of
the A/V jack normal?
(Check R172)
Yes
Sam as Block A
Check the input source.
No
6. In case of becomes unusual display from Side AV mode.
Is video input 
of the A/V jack normal?
(Check CN703
Pin9)
Yes
Sam as Block A
Check the input source.
No
CN703
Pin 11
CN703
Pin 1,3
7. In case of becomes unusual display from Side S-Video mode.
Is video input 
of the A/V jack normal?
(Check CN703
Pin9)
Yes
Sam as Block A
Check the input source.
No
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