Read LG 27LS5400 / 27LS540T (CHASSIS:LD02M) Service Manual online
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3. No Video - TV
Check Tuner(TU2601 or 02 or 03)
SIF #6 CVBS #8
Replace Tuner(TU2601 or 02 or 03)
Recheck
N
Y
Check RF Cable
Y
1. Check Tuner(TU2601 or 02 or 03 #5) Power (3.3V)
2. Check IC803 Output voltage(3.3V)
Replace IC803
Y
N
Check Tuner(TU2601 or 02 or 03) I2C Signal
SCL(R2609), SDA(R2610)
Check IC101
N
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
Replace IC805
Replace IC806
Y
N
Check Tuner(TU2601 or 02 or 03) I2C Signal
SCL(R2609), SDA(R2610)
Check IC101
N
Y
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