50PB4RT-MA (CHASSIS:PP78B) - LG TV Service Manual (repair manual). Page 19

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11. In the case of becomes unusual display from SCART 2 mode(main)
12. In the case of becomes unusual display from SCART 2_YC mode(main)
Is normal video
input of the A/V jack?
(Check R115)
Check the input source
Is normal video
input of the A/V jack?
(Check R115, R149)
Check the input source
Same as Block A
Same as Block A
YES
NO
YES
NO
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