LG 22LS3700 - Video Signal Troubleshooting

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Only for training and service purposes
2. Digital TV Video
3. Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 pin 2 : 1.8V
Check DIF[P]/[N] Signal
TU3704 Pin 10/11
Replace IC3703
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 pin 2 : 1.8V
Replace IC3703 .
Check Mstar LVDS Output
Replace Mstar (IC101) or Main Board.
ok
ok
ok
No
No
No
Check CVBS Signal
TU3704 8 Pin
ok
No
Bad Tuner. Replace Tuner.