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LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. AV Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK3402
Can you see the normal waveform?
Y
Check the input of LG1311 (IC101).
Measure waveform at C3404 because it’s more easy to check.
Can you see the normal waveform?
Y or N
This board has big problem because Main chip (LG1311, IC101) have some troubles.
After checking thoroughly all path once again, You should decide to replace Main IC or not.
Replace JK3402
N
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