Read LG 42CL11-UA (CHASSIS:LA92A) Service Manual online
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8. All Source Audio
Check Mstar I2S Output
R604, R605, R606
Check IC600 Power
*20V, 3.3V, 1.8V.
OK
OK
Make sure you can’t hear any audio.
OK
First check the TV SPEAKER Menu
(Menu > Sound > TV Speaker)
Toggle the menu.
OK
Check Mstar AUDIO_MASTER_CLK
R603
OK
Check Connector & P600
Check Regulator IC601, IC704
No
Check signal line. Or replace IC100.
No
Replace Mstar(IC100) or Main board.
No
No
Check Output Signal P600 1, 2, 3, 4 pin.
OK
Replace NTP(Audio AMP)
IC500.
No
Replace connector if found to be damaged.
No
OK
Check speaker resistance
and connector damage.
Replace speaker.
No
*20V Voltage is dependent on model.
32/36LH20, 32LH30 => 24V
19/22LH20 => 15V(pin1 or 2)
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