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42LD550 (CHASSIS:LA02B) - LG TV Service Manual (repair manual). Page 49

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3. Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L701
Replace L701
Check Tuner 1.2V Power 
IC700   2 pin : 1.2V
Check CVBS Signal
TU700  11 Pin
Replace IC700.
Check Tuner 5V Power
L700
Check IC8003
ok
ok
ok
ok
ok
No
No
No
No
No
Replace IC8003
No
Bad Tuner. Replace Tuner.
Replace  L8007
ok
Check FRC and BCM LVDS Output
Replace Mstar(IC9001) or BCM( IC900)
or Main Board.
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