Read LG 42LT670H (CHASSIS:LA2AF) Service Manual online
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Digital RF Trouble Shooting guide
Check RF cable & signal
Check tuner 5V power L3000
Y
Check IIC Signal
TU3001 Pin#3,4
Y
Check DIF Signal
TU3001 Pin#10,11
Y
Check X201
and application circuit
Check IC5000
Replace TU3001
Replace TU3001
N
N
N
Replace IC101
N
Replace IC5000
N
Y
Replace X201
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