Read LG 55LK520 (CHASSIS:LA01U) Service Manual online
Trouble shooting guide
3. Analog 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 CVBS Signal
TU3702 11 Pin
Replace IC3703 .
Check Tuner 5V Power
L3702
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
Check
IC411
No
Replace
IC411
No
Replace L3702
ok
※ When the PCB is EAX63529602
IC411 is not available.
In this case, check IC406 is 5V or not
Click on the first or last page to see other 55LK520 (CHASSIS:LA01U) service manuals if exist.