42LB1R (CHASSIS:LP7BA) - LG TV Service Manual (repair manual). Page 22

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15. In case of becomes un
usua
l d
isplay
 from comp
onent1 mo
de(main/sub)
16. In case of becomes un
usua
l d
isplay
 from component 2 mode(main/su
b)
17. In case of becomes un
usua
l display
 from RGB mode(main/sub)
Is normal video
 input
of the JK102?
(Check L126, L127, L128)
Check the input source
Is normal video
 input
of  the JK103?
(Check L129, L130, L131)
Is normal R, G, B input
and H,V s
ync 
of the JK500?
(Check R509, R511, R512
R513, R5
15)
Check the input source
Check the input source
Chan
ge IC(IC7
00)
Chan
ge IC(IC7
00)
Chan
ge IC(IC7
00)
YE
S
NO
YE
S
NO
YE
S
NO
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