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LG Electronics. Inc. All rights reserved.
Only for training and service purposes
7. Analog RF Audio Trouble Shooting guide
Check RF Cable & Signal
Check Audio AMP output
L5602,L5603,L5604,L5605
Y
Check TU8900 Pin2 (SIF Output)
Can you see the normal signal?
Y
Could you measure voltage of TU8900& IIC lines?
Are they all normal?
N
You should check power line & IIC lines.
N
You should replace TUNER.
Y
Check IC5600
Y
Replace IC5600
N
Replace L5602,L5603,L5604,L5605
N
Y
After checking audio signal line, you should decide to replace item or not.
8. AV/Component Audio (in) Trouble shooting guide
Check input signal format.
Is it supported?
Check JK3400
Can you see the normal waveform?
Replace JK3400
Y
N
Check AC cable for damage
For damage or open conductor
Y
Y
Check the input of M14+(IC101).
Measure waveform at C3403 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 32LX770M
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