LG 55G2 Service Manual page 71

5. Trouble shooting - No video (Component)
Check input signal format.
Is it supported?
ok
Check Component Cable
for damage or open conductor.
ok
Check JK3801
COMP1_Y, COMP1_Pb,
COMP1_Pr signal Line
ok
Check COMP1_DET Signal
ok
Check L9 Ace(IC101) Chip
ok
Check L9 D-chip (IC100) Chip
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Only for training and service purposes
No
Replace Jack
No
Replace R3806 or Jack
No
Replace IC101
No
Replace IC100 or Main Board
LGE Internal Use Only