Read LG 55LK520 (CHASSIS:LA01U) Service Manual online
Trouble shooting guide
2. Digital TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.2V Power
IC3703 2 pin : 1.2V
Check IF_P/N Signal
TU3702 17/18 Pin
Replace IC3703
Check Tuner 5V Power
L3702
Check
IC411
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
No
Replace
IC411
No
Bad Tuner. Replace Tuner.
Replace L3702
ok
※ When the PCB is EAX63529602
IC411 is not available.
In this case, check IC406 is 5V or not
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