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42LW5600 (CHASSIS:LA12C) - LG TV Service Manual (repair manual). Page 65

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Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1105
Y/PB/PR signal Line
ok
ok
ok
No
Replace Jack
Check COMP_DET Signal
Replace R1114 or R130
No
ok
No
Check BCM LVDS Output
Replace BCM( IC101) or Main Board.
5. Trouble shooting - No video (Component)
ok
No
Check FRC IC LVDS Output
Replace FRC ICIC5201) or Main Board.
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