Read LG 32LP560M (CHASSIS:LA3AA) Service Manual online
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Composite Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK1700
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at C217 because it’s more easy to check.
Can you see the normal waveform?
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.
Replace JK1700
N
HDMI Video 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 HDCP key NVRAM(IC103)
Power & I2C signal
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.
Replace JK800, JK801, JK802
N
Replace IC103
N
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