LG 47LD920 (CHASSIS:LD01I) Service Manual ▷ View online
Screen
normal?
N
Y
Check external
device
connection
condition
device
connection
condition
Y
N
Check and
replace Link
Cable
replace Link
Cable
Normal?
Y
N
Screen
normal?
Replace Main B/D
Replace
module
module
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
-External Input
-Component
-RGB
-HDMI/DVI
End
Vertical/Horizontal bar, residual image, light spot
Request repair
for external
device
for external
device
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
☞A16
External device screen error-Color error
External
Input
error
Connect other external
device and cable
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
N
Y
Replace
Main B/D
Main B/D
Screen
normal?
Check screen
condition by
input
-External
Input
-Component
-RGB
-HDMI/DVI
condition by
input
-External
Input
-Component
-RGB
-HDMI/DVI
Request repair for
external device
external device
Component
error
RGB
error
HDMI/
DVI
Connect other external
device and cable
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
Replace
Main B/D
Main B/D
Screen
normal?
N
Y
Check S/W Version
Y
N
Check
version
S/W Upgrade
Y
N
Normal
screen?
End
Y
N
Replace T-Con Board
And Adjust VCOM
And Adjust VCOM
LGD Module
Replace
Module
Module
Other Module
Replace module
in abnormal displaying
after exchanging T-Con B'd
in abnormal displaying
after exchanging T-Con B'd
Screen
normal?
End
☞167
Established
date
Revised date
2008. 3 .05
5/13
LCD TV
Error
symptom
Standard Repair Process
☞A13
☞ A14/ A15
Check Test pattern
B. Power error
No power
Red lamp
display
Y
N
Check Power
On with local
key or
Remocon
On with local
key or
Remocon
Y
N
Normal
operation?
Check Power
On ‘”High”
On ‘”High”
Check AC cord
connection and
voltage
connection and
voltage
Check ST-BY
(Lamp)
(Lamp)
Replace
Power
B/D
Power
B/D
Measure voltage of each output of Power B/D
N
Y
Normal
voltage?
Replace Main B/D
N
Y
OK?
Replace Main B/D
N
Y
Normal
voltage?
Check ST-BY 5V
Check and fix outlet and power cord connected condition
Replace Power B/D
N
Y
Normal
voltage?
Replace Power
B/D
B/D
Y
☞A17
☞A18
☞A19
☞A20
Standard Repair Process
Established
date
Revised date
2008. 3 .05
6/13
LCD TV
Error
symptom
B. Power error
Off when on, off while viewing, power auto on/off
Error?
N
Y
Check Power Off
Mode
Mode
Fix A/C code/Outlet
and describe 3 wave
length
and describe 3 wave
length
Check A/C code
Check for 3 wave length
Check outlet
Replace Main B/D
Key Time
Out
CPU
Abnormal
On 15
Minute
Reset Off mode
(If Power Off mode
is not displayed)
Check Power B/D
voltage
is not displayed)
Check Power B/D
voltage
Y
N
Replace Main B/D
Normal
voltage?
Replace Power B/D
Replace Power B/D
N
Y
Normal?
End
※ Caution
Check and fix exterior
of Power B/D/Part
Describe
situation
Not a problem
situation
Not a problem
※ If there is no
signal, it is the
15 min OFF
function
signal, it is the
15 min OFF
function
☞A21
☞A22
Established
date
Revised date
2008. 3 .05
7/13
LCD TV
Error
symptom
Standard Repair Process
No audio
Screen normal
Screen normal
Check user
menu >
Speaker off
menu >
Speaker off
Off
N
Y
Cancel OFF and describe
Check audio B+
20V or 24V of
Power Board
20V or 24V of
Power Board
Normal
voltage
voltage
Y
N
Replace Power Board and repair parts
Check
Speaker
disconnection
Speaker
disconnection
N
Y
Replace Speaker
Replace MAIN Board
End
C. Audio error
No audio/ Normal video
☞A23
☞A24
Disconnection
Established
date
Revised date
2008. 3 .05
8/13
LCD TV
Error
symptom
Standard Repair Process
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