LG 24LN451B Service Manual page 15

3. No Video - Digital TV
Check RF Cable
Y
1. Check Tuner(TU3700 #5) Power (3.3V)
2. Check IC803 Output voltage(3.3V)
Y
1. Check Tuner(TU3700 #7) Power (1.8V)
2. Check IC805 Output voltage(1.8V)
Y
Check Tuner(TU3700) I2C Signal
SCL(R3735), SDA(R3736)
Y
Check Tuner(TU3600)
Data, CLK, SYN, VAL
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Only for training and service purposes
N
N
N
N
Replace Tuner(TU3600)
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Replace IC803
Replace IC805
Check IC101
Recheck
LGE Internal Use Only