LG V9120W Service Manual page 30

(B) No Sound
No Sound.
Check the Vcc of IC751 Pins1, 11, 19,
22, 33.
Check the Tuner SiF signal at IC751
Pin2.
Check the oscillator of IC751 Pins5, 6.
Check the Audio of IC751 Pins30, 31.
Check the Audio of IC801 Pins2, 3.
Check the Audio of IC801 Pins16, 17.
Check the Audio of IC802 Pins3, 5.
Check the Signal flow from IC802
Pins3, 5, JK902.
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
Check the Tuner SIF of TU701 Pin22.
NO
NO
Check the IIC Clock and Data at IC751
Pins12, 13.
NO
Check the signal flow from IC751
Pins30, 31 to IC801 Pins2, 3.
NO
Check the IIC Clock and Data at IC801
Pins42, 43.
NO
Check the signal flow from IC801
Pins16, 17 to IC802 Pins11, 16.
3-19
Check 5.0V Line.
Replace X751