LG 42LN541C, Service Manual, Page: 17 / 34

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6. All Source Audio
Check the TV Speaker Menu
(Menu -> Audio -> TV Speaker)
On
ok
ok
Replace C535, C537, C538, R516, R517
Check Connector & P501
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC501) Power
24V, 3.3V
No
Replace Amp IC(IC501)
Check Output Signal P501
1, 2, 3, 4 pin.
No
Check Mstar AUDIO_MASTER_CLK
R148
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R503, R504
No
Check signal line. Or replace Mstar(IC101)
Replace Audio AMP IC(IC501) Check signal line, L505, L506
ok
No
7. Digital/Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L1003
Replace L1003
Check Tuner 1.8V Power
IC1001 2 pin : 1.8V
Check IF_P/N Signal
TU1002 6 Pin
Replace IC1001
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.