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42LH301C (CHASSIS:LD91A) - LG TV Service Manual (repair manual). Page 57

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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 ?
NO
YES
Check MAIN B’D C209, C215 (Y)
C216 (Pb)
C214 (Pr)
Video Signal ?
Replace
MAIN B’D C209 or C214 or C215 or C216
NO
Replace MAIN B’D IC 100
YES
Making 
Revision 
2009. 2 . 1
13/34
 LCD TV
Symptom
Component No Video/
No Color Problem
26~42LH2000
32~47LH3000/LH4000
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