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8. 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 JK4600
Can you see the normal waveform?
Y
Check the input of MTK(IC105).
Measure waveform at C610, C611 because it's more easy to check.
Can you see the normal waveform?
Y
Check Audio AMP output L5402,
L5403, L5404, L5405.
Y
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.
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Only for training and service purposes
N
Replace JK4600.
N
Replace L5402, L5403, L5404,
L5405.
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LGE Internal Use Only
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