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37LH3000, 37LH3010, 37LH3020, 37LH3040 (CHASSIS:LD91A) - LG TV Service Manual (repair manual). Page 55

Read LG 37LH3000 / 37LH3010 / 37LH3020 / 37LH3040 (CHASSIS:LD91A) Service Manual online

Check Signal format
Is it supported?
Check the CVBS Cable
YES
MAIN B’D JK402 Check
Replace MAIN B’D JK402
YES
NO
Check MAIN B’D R400
Video Signal ?
NO
YES
Check MAIN B’D C217
Video Signal ?
Replace MAIN B’D C217
NO
Replace MAIN B’D IC 100
YES
Making 
Revision 
2009. 2 . 1
 LCD TV
Symptom
AV3(CVBS) No Video Problem
26~42LH2000
32~47LH3000/LH4000
10/34
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