LG 55G2 Service Manual page 68

2. Trouble shooting - No video (Digital TV video)
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L6503
ok
Check Tuner 1.8V Power
IC6503 2pin : 1.8V
ok
Check DIF_P/N Signal
TU6500 10/11 Pin
ok
Check DIF at destination
C116, C117
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 L6503
No
Replace IC6503
No
Bad Tuner. Replace Tuner.
No
Bad Capacitor.
Replace Capacitor.
No
Replace IC101
No
Replace IC100 or Main Board.
LGE Internal Use Only