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Only for training and service purposes
8. AV/Component Audio (in) Trouble shooting guide
Check input signal format.
Is it supported?
Check JK3402
Can you see the normal waveform?
Replace JK3402
Y
N
Check AC cable for damage
For damage or open conductor
Y
Y
Check the input of M14+(IC101).
Measure waveform at C3404, C3405, C3406 because it’s more easy to check.
Can you see the normal waveform?
Y
Check Audio AMP output
L5602,L5603,L5604,L5605
Y
Replace L5602,L5603,L5604,L5605
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.
Summary of Contents for 40LX770H
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