LG Electronics 37LT760H-ZA 9. AV / RGB-PC Audio in Trouble Shooting guide

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9. AV / RGB-PC Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
This board has big problem because Main chip (MTK) have some troubles.
After checking thoroughly all path once again, You should decide to replace MTK or not.
Check JK4600/JK3604
Can you see the normal waveform?
Check Audio AMP output L5402,
L5403, L5404, L5405.
Check AC cable for damage
For damage or open conductor
Check the input of MTK(IC105).
Measure waveform at C610, C611, C319, C320 because it’s more easy to check.
Can you see the normal waveform?
Replace JK4600/JK3604.
Replace L5402, L5403, L5404,
L5405.
N
N
Y
Y
Y
Y
Y