LG 55G2 Service Manual page 70

4. Trouble shooting - No video (AV)
Check input signal format.
Is it supported?
ok
Check AV Cable for damage
for damage or open conductor
ok
Check JK3800 CVBS Signal Line
AV1_CVBS_IN : L504
ok
Check CVBS_DET Signal
AV1_CVBS_DET : R3810
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 R3810 or Jack
No
Replace LG1152A(IC101)
or Main Board.
No
Replace IC100 or Main Board.
LGE Internal Use Only