LG 40LX770H Service Manual page 26

10. Audio out Trouble shooting guide
Check the output of Main IC(IC101).
Measure waveform at IC5600(Pin7, 8, 10, 11, 14).
because it's more easy to check. Can you see the
normal signal?
Y
Check Audio AMP output
L5503,L5504,L5505,L5506
Can you see the normal waveform?
Y
Check the speaker output wafer P5600.
Can you see the normal waveform?
Y
Check the connector & Speaker
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Only for training and service purposes
This board has big problem because Main chip
N
(M14+) have some troubles.
After checking thoroughly all path once again,
You should decide to replace M14+ or not.
After checking the Power & I2C & Reset of this chip,
N
you should decide to replace this or not.
After checking audio signal line, you should decide
N
to replace item or not.
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