Read LG 60PZ750-UG (CHASSIS:PU12A) Service Manual online
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All Source Audio Trouble Shooting
Make sure you can’t hear any audio
Check Signal (PWM)
L1600~L1603
Replace L1600~L1603
Y
N
Check Power
17V(L1604), 3.3V(L1605)
Replace 17V(L1604), 3.3V(L1605)
Y
N
Check Connector
P1600
Check BCM I2S Output
R1605~R1608
Y
Replace IC501.
N
Check speaker for damage.
Y
Check IC16000 Status
/PDN(#23), /Reset(#30) is High?
Replace IC1600
N
Replace P1600
N
Replace the Speaker
N
Y
Y
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