LG 37LH250H Service Manual page 21

8. All Source Audio
Make sure you can't hear any audio.
OK
Check Mstar AUDIO_MASTER_CLK
OK
Check Mstar I2S Output
R604, R605, R606
OK
Check IC500 Power
*24V, 3.3V, 1.8V.
OK
Check Output Signal P600 1, 2, 3, 4 pin.
OK
Check Connector & P600
OK
Check speaker resistance
and connector damage.
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Only for training and service purposes
No
Replace Mstar(IC100) or Main board.
No
Check signal line. Or replace IC100.
No
Check Regulator IC601, IC704
No
Replace NTP(Audio AMP) IC500
No
Replace connector if found to be damaged.
No
Replace speaker.
- 21 - LGE Internal Use Only