55SL8500-ZA (CHASSIS:LD91K) - LG TV Service Manual (repair manual). Page 19

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10. AV2 No Video Out Problem
Check Spec (Refer to User Manual)
Is it supported?
Check the SCART Cable
YES
YES
Check MAIN B’D C1122
Video Signal ?
NO
MAIN B’D JK1101 Check
YES
MAIN B’D C1109
Video signal ?
NO
Replace MAIN B’D IC 100
11. Component No Video / No Color Problem
Check Signal format
Is it supported?
Check the Component Cable
YES
MAIN B’D JK400 Check
Replace MAIN B’D JK400
YES
NO
Check MAIN B’ D R419
Video Signal ?
YES
NO
Check MAIN B’D C215, C209 (Y)
C214 (RED)
C216 (BLUE)
Video Signal ?
Replace
MAIN B’D C215 or C209 or C214 or C216
NO
Replace MAIN B’D IC 100
YES
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