LG 32LP560M Service Manual page 22

Composite / RGB-PC Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK1700, P800
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at C236, C237, C244, C245 because it's more easy to check.
Can you see the normal waveform?
Y
Check Audio AMP output
L503,L504,L505,L506
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
HDMI Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK800, JK801, JK802
Can you see the normal waveform?
Y
Check Audio AMP output
L503,L504,L505,L506
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
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Only for training and service purposes
N
Replace JK1700, P800
N
Replace L503,L504,L505,L506
N
Replace JK800, JK801, JK802
N
Replace
L503,L504,L505,L506
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