LG 42LK450A Service Manual page 15

2. Digital TV Video
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L3703
ok
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
ok
Check IF_P/N Signal
TU3700 10/11 Pin
ok
Check Mstar LVDS Output.
3. Analog TV Video
Check RF Cable & Signal.
ok
Check Tuner 3.3V Power.
L3703
ok
Check Tuner 1.8V Power.
IC3703 2 pin : 1.8V
ok
Check CVBS Signal.
TU3700 8 Pin
ok
Check Mstar LVDS Output.
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Only for training and service purposes
No
Replace L3703.
No
Replace IC3703.
No
Bad Tuner. Replace T uner.
No
Replace Mstar(IC101) o r Main Board.
No
Replace L3703.
No
Replace IC3703.
No
Bad Tuner. Replace Tuner.
No
Replace Mstar(IC101) or Main Board.
- 15 - LGE Internal Use Only