Zenith XBR411 Manual page 24

VCR ELECTRICAL TROUBLESHOOTING GUIDE
(B) No Sound
No Sound.
Check the Vcc of IC801 Pins15, 32, 36,
46.
Check the Tuner SiF signal at IC801
Pin57.
Check the oscillator of IC801 Pin51.
Check the Audio of IC801 Pins78, 80.
YES
YES
YES
YES
NO
NO
Check the Tuner SIF of TU701 Pin22.
NO
NO
Check the IIC Clock and Data at IC801
Pins37, 38.
3-16
Check 5.2V Line.
Replace X301