LG 42PT81 Service Manual page 23

15. In the case of an unusual display in component 1 mode(main/sub).
Is the video
input of the JK102
normal? (Check L126,
L127,L128)
Yes
Change the IC(IC700)
16. In the case of an unusual display in component 2 mode(main/sub).
Is the video
input of the Jk103 normal?
(Check L129, L130,
L131)
Yes
Change the IC(IC700)
17. In the case of an unusual display in RGB mode(main/sub).
Is the
R, G, B input
and H, V sync of the
JK500 normal?(Check R509,
R511, R512, R513,
R515)
Yes
Change the IC(IC700)
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Only for training and service purposes
No
Check the input source.
No
Check the input source.
No
Check the input source.
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