LG 42LY750H Service Manual page 20

Analog RF Video Trouble Shooting guide
Check RF cable & signal
Y
Check TU6500 Pin8
(Video output)
Y
Check tuner 5V power L6501
Y
Check tuner 3.3V power L6500
Y
Check tuner 1.8V power IC6500
2pin : 1.8V
Y
Check MTK LVDS output
Digital RF Trouble Shooting guide
Check RF cable & signal
Y
Check tuner 5V power L6501
Y
Check IIC Signal
TU6500 Pin# 3, 4
Y
Check DIF Signal
TU6500 Pin#10,11
Y
Check X100
and application circuit
Replace IC105
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Only for training and service purposes
N
Replace Tuner.
Y
N
Check IC2404
N
Check IC2405
N
Replace IC6500
N
Replace IC105
N
Check IC2404
N
Replace TU6500
N
Replace TU6500
N
Replace X100
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N
Replace IC2404
N
Replace IC2405
N
Replace IC2404
LGE Internal Use Only