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55LV3700 (CHASSIS:LA12B) - LG TV Service Manual (repair manual). Page 54

Read LG 55LV3700 (CHASSIS:LA12B) Service Manual online

3. Trouble shooting - No video (Analog TV video)
Check RF Cable & Signal
Check Tuner 3.3V Power
L5105
Replace L5105
Check Tuner 1.2V Power 
IC5103  2 pin : 1.2V
Check CVBS Signal
TU5101 11 Pin
Replace IC5103
Check Tuner 5V Power
L5101, L5103
Check IC507
ok
ok
ok
ok
ok
No
No
No
No
No
Replace IC507
No
Bad Tuner. Replace Tuner.
Replace  L5101, L5103
ok
Check BCM LVDS Output
Replace BCM( IC101) or Main Board.
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