Read LG 42LT760H-SA (CHASSIS:LJ3AZ) Service Manual online
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Analog RF Video Trouble Shooting guide
Check RF cable & signal
Y
Check TU6500 Pin8
(Video output)
Y
Check tuner 5V power R6513
Y
Check tuner 3.3V power L6502
Y
Check tuner 1.8V power IC6501
2pin : 1.8V
Y
Check MTK LVDS output
Replace Tuner.
N
Check IC2404
Replace L6502
Replace IC6501
N
N
N
Replace IC105
N
Replace IC2404
N
Y
Digital RF Trouble Shooting guide
Check RF cable & signal
Check tuner 5V power R6513
Y
Check IIC Signal
TU6500 Pin#3,4
Y
Check TS Signal
TU6500 Pin#17,18,19,27
Y
Check X100
and application circuit
Check IC2404
Replace TU6500
Replace TU6500
N
N
N
Replace IC105
N
Replace IC2404
N
Y
Replace X100
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