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42LK550 (CHASSIS:LA12B) - LG TV Service Manual (repair manual). Page 53

Read LG 42LK550 (CHASSIS:LA12B) Service Manual online

Check RF Cable & Signal
Check Tuner 3.3V Power
L5105
Replace L5105
Check Tuner 1.26V Power 
IC5103  2pin : 1.26V
Check IF_P/N Signal
TU5101 17/18 Pin
Replace IC5103.
Check Tuner 5V Power
L5101, L5103
Check IC507
Check  BCM LVDS Output
Replace  or BCM( IC101) or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
No
Replace IC507
No
Bad Tuner. Replace Tuner.
Replace L5101, L5104
ok
2. Trouble shooting - No video (Digital TV video)
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