LG 42LK430 - Video Signal Troubleshooting; Digital TV Video Issues; Analog TV Video Issues

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2. Digital TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703.
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check IF_P/N Signal
TU3700 10/11 Pin
Replace IC3703.
Check Mstar LVDS Output.
Replace Mstar(IC101) o r Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
3. Analog TV Video
Check RF Cable & Signal.
Check Tuner 3.3V Power.
L3703
Replace L3703.
Check Tuner 1.8V Power.
IC3703 2 pin : 1.8V
Check CVBS Signal.
TU3700 8 Pin
Replace IC3703.
Check Mstar LVDS Output.
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.