LG LGXBR342 Service Manual page 24

VCR ELECTRICAL TROUBLESHOOTING GUIDE
(B) No Sound
No Sound.
Check the Vcc of IC701 Pins1, 11, 19,
22, 33.
Check the Tuner SiF signal at IC701
Pin2.
Check the oscillator of IC701 Pins5, 6.
Check the Audio of IC701 Pins30, 31.
Check the Audio of IC801 Pins2, 3.
Check the Audio of IC801 Pins16, 17.
YES
YES
YES
YES
YES
YES
NO
NO
Check the Tuner SIF of TU701 Pin22.
NO
NO
Check the IIC Clock and Data at IC701
Pins12, 13.
NO
Check the signal flow from IC701
Pins30, 31 to IC801 Pins2, 3.
NO
Check the IIC Clock and Data at IC801
Pins42, 43.
3-16
Check 5.2V Line.
Replace X751