LG 42PW340 Service Manual page 60

9. All Source Audio Trouble Shooting
Make sure you can't hear any audio
Y
Check Speaker
Y
Check Connector P700
Y
Check Signal
L700, L701, L702, L703
Y
Check IC700 Power
17V, 3.3V
L511, L509
Y
Check Mstar S7R I2S Output
R711, R712, R713, R714
Y
Maybe Mstar S7R(IC101)
has problems
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Only for training and service purposes
N
Replace Speaker
N
Replace Connector
Replace one of
N
Capacitor, Register
& Recheck
N
Replace It & Recheck
N
Replace It & Recheck
N
Maybe STA368 has problems.
Replace It
LGE Internal Use Only