LG 42LG30 Service Manual page 22

All Source Audio
Make sure you can't hear any audio
Y
Check Mstar I2S Output
R1048, R1050, R1051
Y
Check IC501 Power 16V, 3.3V, 1.8V
Y
Check Output Signal
L503, L504
Y
Check Connector & P500
Y
Check speaker resistance and cone for
damage.
Digital TV Audio
Check video output
Y
Follow procedure All source audio trouble
shooting guide
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Only for training and service purposes
N
Check signal line. Or replace IC100
N
Check power supply regulator & line.
N
Replace NTP or check output line.
Replace connector if found to be
N
damaged
Y
Replace speaker
Follow procedure digital TV video
N
trouble shooting guide.
N
Replace Mstar IC
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LGE Internal Use Only