LG 42LG30 Service Manual page 16

Digital TV Video
Check RF Cable
Y
Check Tuner 5V Power
IC710 #3 Pin
Y
Check IF_P/N Signal
Y
Check Demodulator Input Clock
X400 (25MHz)
Y
Check IC400(LGDT) Output
-. AR401, AR402
Y
Check Mstar LVDS output
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Only for training and service purposes
N
Replace IC710
N
Bad Tuner. Replace Tuner.
N
Replace it X400
N
Replace IC400
N
Replace Mstar(IC100)
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LGE Internal Use Only