LG 40LX770H Service Manual page 22

5. AV/Component Trouble Shooting guide
Check input signal is supported format
Y
Check AC cable for damage or open
conductor
Y
Check JK3402
Can you see the normal waveform?
Y
Check the input of Main IC(IC101).
Measure waveform at C3404, C3405,
C3406 because it's more easy to check.
Can you see the normal waveform?
6. HDMI Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK3200/JK3202/JK3203
Can you see the normal waveform?
Y
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.
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Only for training and service purposes
JK3402 may have problem.
N
Replace this Jack.
This board has big problem because
N
Main chip (M14+) have some troubles.
After checking thoroughly all path once
again, You should decide to replace
M14+ or not.
JK3200/JK3202/JK3203 may have
N
problem. Replace this Jack.
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