Read LG 42LH50YD (CHASSIS:LJ91C) Service Manual online
9. All Source Audio Trouble Shooting
Make sure you can’t hear any
audio
Y
Check Connector P500
N
Y
Y
Check Speaker
Replace Connector
Check Signal
L504, L506
N
Replace one of
L508/L509/L510/L511/L504/L506
& Recheck
Y
Check IC500 Power
20V, 3.3V, 1.8V
L500,L501,L502,L503,IC504
N
Replace It & Recheck
Y
Check BCM3556 I2S Output
R148, R149, R150
N
Replace It & Recheck
Y
Maybe BCM3556(IC100)
has problems
Replace Speaker
N
N
Maybe NTP3100 has problems.
Replace It
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