Read LG 22LQ630H (CHASSIS:LA1EX) Service Manual online
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7. RGB-PC Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK801/JK802
Can you see the normal waveform?
Y
Check HDCP key NVRAM(IC103)
Power & I2C signal
Y
Check the input of Mstar(IC101).
Measure waveform at R4024, R4025 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 JK801, JK802
N
Replace IC103
N
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