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27LS5400, 27LS540T (CHASSIS:LD02M) - LG TV Service Manual (repair manual). Page 15

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2. No Picture
Module 
Back Light On ?
Check WLED_ENABLE high
R1127
Check IC101
Replace Main Scaler IC
N
N
Check Panel clock
P1002(#10,11,22,23)
Check IC101
Repair Main B/D
N
Check Panel power
P1002(#1,2,3) 5V
IC802 Output 5V
Replace  IC802
N
Y
Replace T-con
Board or module 
Check FFC Cable for damage 
or open conductors.
Replace Cable
N
Y
Y
Y
Check LED Driver output
(P1101/P1103 #1,2,5,6)
Check LED Driver IC1100 
Replace LED Driver IC
N
Y
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