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26LC41, 26LC42, 26LC4R (CHASSIS:LP78A) - LG TV Service Manual (repair manual). Page 20

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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
Check the input source.
No
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
Check the input source.
No
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
Check the input source.
No
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