Read LG 42LD550 (CHASSIS:LA02B) Service Manual online
2. Digital TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L701
Replace L701
Check Tuner 1.2V Power
IC700 2pin : 1.26V
Check IF_P/N Signal
TU700 17/18 Pin
Replace IC700.
Check Tuner 5V Power
L700
Check IC8003
Check FRC and BCM LVDS Output
Replace Mstar(IC9001) or BCM( IC900)
or Main Board.
or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
No
Replace IC8003
No
Bad Tuner. Replace Tuner.
Replace L8007
ok
Click on the first or last page to see other 42LD550 (CHASSIS:LA02B) service manuals if exist.