LG 43LX560H Service Manual page 22

7. RGB-PC Video Trouble shooting guide
Check input signal format.
Is it supported?
YES
Check AC cable for damage
For damage or open conductor
YES
Check P3300
Can you see the normal waveform?
YES
Check the input of Mstar(IC101).
Measure waveform at R234, R235
because it's more easy to check.
Can you see the normal waveform?
8. Analog RF Audio Trouble Shooting guide
Check RF Cable & Signal
Y
Check TU3001 Pin1 (SIF Output)
Can you see the normal signal?
Y
Check Audio AMP output
L5503,L5504,L5505,L5506
Y
Check IC5600
Y
Check the input of Mstar (IC101).
Measure waveform at C115, C116 because it's more easy to
check.
Can you see the normal waveform?
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Only for training and service purposes
NO
You should replace TUNER.
Could you measure voltage of TU3001& IIC lines?
N
Are they all normal?
N
Replace L5503,L5504,L5505,L5506
N
Replace IC5600
N
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P3300 may have problem. Replace this Jack.
This board has big problem
YES
because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again,
You should decide to replace Mstar or not.
Y
After checking audio signal line, you should decide to replace item or not.
N
You should check power line & IIC lines.
LGE Internal Use Only