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50PZ540-UB, 50PZ550-UA (CHASSIS:PU13A) - LG TV Service Manual (repair manual). Page 58

Read LG 50PZ540-UB / 50PZ550-UA (CHASSIS:PU13A) Service Manual online

Great Company  Great People
All Source Audio Trouble Shooting
Make sure you can’t hear any audio
Check Signal (PWM)
L300 L301
Replace L300 L301
Y
N
Check  Power 
16V(C325), 3.3V(L302)
Check 16V(C325), 3.3V(L302)
Y
N
Check Connector
P300
Check BCM I2S Output
R305~R307
Y
Replace IC501.
N
Check speaker for damage.
Y
Check IC300 Status 
/PDN(#19), /Reset(#25) is High?
Replace IC300
N
Replace P300
N
Replace the Speaker
N
Y
Y
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