LG RC-185 Service Manual page 33

VCR ELECTRICAL TROUBLESHOOTING GUIDE
(B) No Sound
No Sound.
Check the Vcc of IC1501 Pins4, 9, 14, 21, 24, 29, 34, 38,
43, 46, 52, 75, 78, 82, 89, 98, 104, 110, 117, 123, 125, 131,
137, 144, 146, 152, 158, 164, 1878,186, 194,196..
Check the Vcc of IC1501 Pins 3, 31, 72,
82, 123, 144, 170, 190
Check the Tuner SiF signal at IC1501
Pin2.
Check the oscillator of IC1501 Pins66, 67.
Check the Audio of IC751 Pins30, 31.
Check the Audio of IC1501 Pins184, 185.
Check the Audio of IC801 Pins16, 17.
Check the Audio of IC802 Pins21, 25.
Check the Signal flow from IC802
pins21, 25, JK905 Pins1, 3.
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
Check the Tuner SIF of TU701 Pin16.
NO
NO
Check the IIC Clock and Data at IC1501
Pins59, 60
NO
Check the signal flow from IC1501
Pins184, 185 to IC801 Pins2, 3.
NO
Check the IIC Clock and Data at IC801
Pins42, 43.
NO
Check the DVD Board Audio Path.
3-19
Check 3.3V Line.
Check 3.3V Line.
Replace X1501