Audio Troubleshooting - LG HCS6000A Service Manual

6. AUDIO TROUBLESHOOTING

(1) NO ATSC Audio
1) Check IC400 and Surroundings
1.8V & 3.3V are supplied to IC400?
Data is input from TU300 to IC400(A11,
E19, A20)?
Data is output from R424?
Fig.01
3.072MHz clock is output from R422?
Fig.02
48kHz clock is output from R421?
Fig.03
YES
YES
YES
YES
NO
NO
NO
NO
NO
3-26
Check the Power Supply Part.
Check Tuner Part.
Check the surroundings of IC401.