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LG Electronics. Inc. All rights reserved.
Only for training and service purposes
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?
Check the speaker output wafer P5600.
Can you see the normal waveform?
After checking audio signal line, you should decide
to replace item or not.
Y
Check Audio AMP output
L5503,L5504,L5505,L5506
Can you see the normal waveform?
Y
Y
Check the connector & Speaker
N
This board has big problem because Main chip
(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,
you should decide to replace this or not.
N
N
Summary of Contents for 40LX770H
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