Read LG 42LN549C / 42LN549E (CHASSIS:LJ3AC) Service Manual online
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No OSD Trouble Shooting
Check P1201
Voltage Level ST5V
Check
Power connector
Replace Power board
Check LVDS Cable
Check LCD Module
Control board
Y
N
Y
Y
Check Q706 OUT
Voltage Level 3.3V
Replace Q706
Y
N
Replace Cable
N
Digital TV Video Trouble Shooting
Check RF Cable
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has
problems
Check LGDT3304 Output
Clock(R404),
Data(AR436,437), Sync(R441)
Y
Y
N
Check Tuner 5V Power
IC701
Replace IC701
Y
N
Y
Maybe LGDT3304(IC400) has
problems
N
Maybe LGDT3304(IC400) has
problems
Check LD400 color
Bad Tuner. Replace Tuner.
None
red
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