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55LM5800, 55LM580Y (CHASSIS:LB21B) - LG TV Service Manual (repair manual). Page 18

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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) or Main Board
.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner
.
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 2 pin : 1.8V
Replace IC3703 .
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
ok
ok
ok
No
No
No
Check CVBS Signal
TU3700 8 Pin
ok
No
Bad Tuner. Replace Tuner
.
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