LG LST-4200A Service Manual - Page 19

AUDIO Part

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2. AUDIO Part (1) When there is no NTSC Audio. 1) Check IC203 and its around circuits. NO Are 1.8V and 3.3V supplied to IC203? YES Does data come from NO HA_DACLRCH(IC203(G3)? YES Does 3.072MHz clock come from NO R230? YES Does 48kHz clock come from R229? NO Check Power Supply part. Check around circuits of IC203. 3-10

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3-10
2. AUDIO Part
(1) When there is no NTSC Audio.
NO
NO
NO
NO
YES
YES
YES
1) Check IC203 and its around circuits.
Are 1.8V and 3.3V supplied to IC203?
Does data come from
HA_DACLRCH(IC203(G3)? <Fig.01>
Does 48kHz clock come from R229?
<Fig.03>
Does 3.072MHz clock come from
R230?<Fig.02>
Check Power Supply part.
Check around circuits of IC203.