Read LG 50PT350B-SG (CHASSIS:PB12K) Service Manual online
9. All Source Audio Trouble Shooting
Make sure you can’t hear any audio
Y
Check Connector P700
N
Y
Y
Check Speaker
Replace Connector
Check Signal
L700, L701, L702, L703
N
Replace one of
Capacitor, Register
& Recheck
Y
Check IC700 Power
17V, 3.3V
L511, L509
N
Replace It & Recheck
Y
Check Mstar S7LR I2S Output
R711, R712, R713, R714
N
Replace It & Recheck
Y
Maybe Mstar S7LR(IC101)
has problems
Replace Speaker
N
N
Maybe STA368 has problems.
Replace It
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