LG 40LX560H Service Manual page 19

4. Digital RF Trouble Shooting guide
Check RF Cable
Y
Check Tuner 5V Power
L3000
Y
Check IIC Signal
TU3001 #3, 4Pin
Y
Check IF Signal
TU3001 #10, 11 Pin
Y
Check X201
and application circuit
Y
Replace IC101
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Only for training and service purposes
N
Check L3000
N
Check IIC line and level shifter circuit
N
Check tuner application circuit or
replace tuner.
N
Replace X201
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Y
N
Replace L3000
Replace IC5000
LGE Internal Use Only