42LY99-ZC (CHASSIS:LD75C) - LG TV Service Manual (repair manual). Page 19

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(7) In the case of becomes unusual display from SCART1 mode
Is Video input 
of the A/V jack(J1200)
normal? 
Yes
Check the input source.
No
Same as Block A.
(8) In the case of becomes unusual display from SCART2 mode
Is Video input 
of the A/V jack(J1201)
normal?
Yes
Check the input source.
No
Same as Block A.
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