LG 40LX560H Service Manual page 23

9. AV/RGB-PC Audio in Trouble shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check P3300, JK5001
Can you see the normal waveform?
Y
Measure waveform at C209, C211 because it's more easy to check.
Y
Check Audio AMP output
L5503,L5504,L5505,L5506
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
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Only for training and service purposes
N
Check the input of Mstar(IC101).
Can you see the normal waveform?
N
Replace P3300, JK5001
Replace L5503,L5504,L5505,L5506
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