LG 27LS5400 / 27LS540T (CHASSIS:LD02M) Service Manual ▷ View 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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4. No Video - Component
Check input signal format
Is it supported?
Check signal
R239,R237,R241
C220,C218,C222
Replace R239,R237,R241
C220,C218,C222
Y
N
Check JK400
Replace JK400 or
Check Device
Y
N
Y
IC101 has problem
Y
Check Component Cable
Wave form of C220
Wave form of C218
Wave form of C222
Wave form of Comp Y
Wave form of Comp Pb
Wave form of Comp Pr
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5. No Video - RGB
Check input signal format
Is it supported?
Check Hsync, Vsync
R4024, R4025
Replace R4024, R4025
Check signal RGB
R228,R230,R232
C204,C206,C208
N
Check P400
Replace P400 or
Check Device
Y
N
Y
Replace R228,R230,R232
C204,C206,C208
N
IC101 has problem
Y
Check RGB Cable
Wave form of R4025(Vsync)
Wave form of R4024(Hsync)
Wave form of R230/C206
Wave form of R228/C204
Wave form of R232/C208
Y
Y
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6. No Video - HDMI
Check input signal format
Is it supported?
Y
Check JK600/JK601
for proper connection or damage
Replace connector
Y
N
Y
Check HDMI Cable for damage
or open connector
Check I2C Signal (JK600/601)
(#15, #16)
Re download EDID data
Y
N
Check HDCP Key (IC101)
Replace Scaler(IC101)
N
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