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LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. AV/Component Trouble Shooting guide
Y
Check input signal format.
Is it supported?
Check JK3200/JK3202/JK3203
Can you see the normal waveform?
Check AC cable for damage
For damage or open conductor
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.
JK3200/JK3202/JK3203 may have
problem. Replace this Jack.
Y
Y
N
Y
Check input signal is supported format
Check JK3402
Can you see the normal waveform?
Check AC cable for damage or open
conductor
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?
JK3402 may have problem.
Replace this Jack.
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.
Y
Y
N
N
6. HDMI Video Trouble Shooting guide
Summary of Contents for 40LX770H
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