LG 22LS5400/540T Service Manual page 16

3. No Video-TV
Check RF Cable
Y
1. Check Tuner(TU2601 or 02 or 03 #5) Power (3.3V)
2. Check IC803 Output voltage(3.3V)
Y
1. Check Tuner(TU2601 or 02 or 03 #7) Power (1.8V)
2. Check IC805 Output voltage(1.8V)
For TU2601, check #13 Power (1.23V) and IC806 also
Y
Check Tuner(TU2601 or 02 or 03) I2C Signal
SCL(R2609), SDA(R2610)
Y
Check Tuner(TU2601 or 02 or 03) I2C Signal
SCL(R2609), SDA(R2610)
Y
Check Tuner(TU2601 or 02 or 03)
SIF #6 CVBS #8
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Only for training and service purposes
N
N
N
N
N
Replace Tuner(TU2601 or 02 or 03)
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Replace IC803
Replace IC805
Replace IC806
Check IC101
Check IC101
Recheck
LGE Internal Use Only