Read LG 47LH9000 (CHASSIS:LD91I) Service Manual online
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Check RF Cable
MAIN B’ D L821 = 5V ?
YES
MAIN B’ D L1202 = 3.3V ?
NO
Replace MAIN B’ D IC809
YES
NO
Replace MAIN B’ D IC808
MAIN B’ D C810
Pin #2 = 1.2V ?
Replace MAIN B’ D IC804
YES
NO
YES
Replace MAIN B’ D IC 100
4. Analog TV Video Problem
Check Signal format
Is it supported?
Check the SCART Cable
YES
MAIN B’ D JK1100 Check
Replace JACK B’ D JK1100
YES
NO
Check MAIN B’ D R1117
Video Signal ?
NO
YES
Check MAIN B’ D C210
Video Signal ?
Replace
MAIN B’ D C210
NO
Replace MAIN B’ D IC 100
YES
5. AV1(SCART CVBS) No Video Problem
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