LG 32LG710H Service Manual page 54

Audio out Trouble shooting guide
Check the output (Pin AD20,AF21,AE20) of BCM3549(IC100).
Measure waveform at R1148,R1147,R1146
because it's more easy to check. Can you see the normal signal?
YES
Check the input (Pin 17,18,19) of NTP3100((IC301).
Can you see the normal waveform?
YES
Check the output (Pin 30,31,36,37,47,48,53,54) of NTP3100((IC301).
Can you see the normal waveform?
YES
Check the speaker output wafer P300.
Can you see the normal waveform?
YES
Check the connector & Speaker
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Only for training and service purposes
This board has big problem because Main chip(BCM3549) have some troubles.
NO
After checking thoroughly all path once again,
You should decide to replace BCM3549 or not.
NO
After checking audio signal line, you should decide to replace item or not.
NO
After checking the Power & I2C & Reset of this chip,
you should decide to replace this or not.
NO
After checking audio signal line, you should decide to replace item or not.
LGE Internal Use Only