Read LG 42LT777H (CHASSIS:LA2FZ) Service Manual online
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Digital RF Trouble Shooting guide
Check RF cable & signal
Check tuner 5V power R8953
Y
Check IIC Signal
TU8900 Pin#4,12
Y
Check DIF Signal
TU8900 Pin#6,14
Y
Check X100
and application circuit
Check IC2404
Replace TU8900
Replace TU8900
N
N
N
Replace IC105
N
Replace IC2404
N
Y
Replace X100
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