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42PB4RTH-TB (CHASSIS:PP7BA) - LG TV Service Manual (repair manual). Page 22

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11. In the case of an unusual display in component 1 mode(main/sub).
Is the video
input of the A/V jack
normal? (Check L126,
L127,L128)
Yes
Change the IC(IC700)
Check the input source.
No
12. In the case of an unusual display in component 2 mode(main/sub).
Yes
Change the IC(IC700)
Check the input source.
No
Is the video
input of the A/V Jk103
normal? (Check L129,
L130, L131)
13. In the case of an unusual display in RGB mode(main/sub).
Yes
Change the IC(IC700)
Check the input source.
No
Is the
R, G, B input
and H, V sync of the
JK500 normal?(Check R509,
R511, R512, R513,
R515)
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