Read LG 42LV5400 (CHASSIS:LA12E) Service Manual online
8. Trouble shooting - No Audio (all audio source)
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P1702
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC1702)
ok
No
Check Connector & P1702
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(IC1702) Power
*24V, 3.3V
No
Check Regulator L1709,L1710,L1711
Check Mstar I2S Output
R1754,5,6
No
Check signal line.
Or replace BCM( IC101)
Check AUDIO_MASTER_CLK
R1753
No
Replace BCM( IC101) or Main Board.
ok
Check AMP I2C Line
R1710,1711
No
Check signal line.
Or replace BCM( IC101)
Click on the first or last page to see other 42LV5400 (CHASSIS:LA12E) service manuals if exist.