Read LG 42LG70YD (CHASSIS:LJ83A) Service Manual online
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Check RF Cable
Check CVBS signal
TU800 #17 Pin
Check RF signal,
Maybe Tuner(TU800) has problems
Check CVBS signal
IC808 #8 Pin
Check CVBS signal
C658
Y
Y
N
Check Tuner 5V Power
IC802 #3 Pin
Replace it
Y
N
Y
Replace IC808 or check L800 5V power
N
Replace it
N
Y
Maybe BCM3553(2)(IC100) has
problems
4. Analog TV Video
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