LG 55G2 Service Manual page 69

3. Trouble shooting - No video (Analog 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 CVBS Signal
TU6500 8 Pin
ok
Check CVBS buffer
Q6501(Emitter)
ok
Check CVBS signal at destination
R571, C549
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 TR. Replace TR.
No
Bad Resistor or Capacitor.
Replace Resistor or Capacitor.
No
Replace IC101
No
Replace IC100 or Main Board.
LGE Internal Use Only