JVC HR-V506EL Service Manual page 40

(3) No sound (Hi-Fi Model)
No sound
Check the Vcc of IC751 Pins 1, 19, 33.
Check the Tuner SiF signal at IC751 Pin 2.
Check the oscillator of IC751 Pins 5, 6.
Check the Audio of IC751 Pins 30, 31.
Check the Audio of IC801 Pins 2, 3.
Check the Audio of IC801 Pins 18, 19.
YES
Check the signal flow from IC801
pins 18, 19 to JK901 Pins 1, 3.
YES
YES
YES
YES
YES
YES
NO
Check 5V power.
NO
Check the Tuner Audio of TU701 Pin 21.
NO
Replace X751.
NO
Check the IIC Clock and Data at
IC751 Pins 12, 13.
NO
Check the signal flow from IC751
Pins 30, 31 to IC801 Pins 2,3.
NO
Check the IIC Clock and Data at
IC801 Pins 42, 43.
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