LG 39LN5400 / 39LN5404 / 39LN5406 / 39LN540V (CHASSIS:LD31B / LD36B) 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
Screen
normal?
Replace
module
module
Check color condition by input
-External Input
-Component
-HDMI
-External Input
-Component
-HDMI
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
☞A10
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,
and HDMI by connecting Jig,
pattern Generator ,Set-top
Box etc.
External Input, Component,
and HDMI 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
-HDMI/DVI
condition by input
-External Input
-Component
-HDMI/DVI
Request repair for
external device
external device
Component
error
HDMI
Connect other external
device and cable
device and cable
(Check normal operation of
External Input, Component,
and HDMI by connecting Jig,
pattern Generator ,Set-top Box
etc.
External Input, Component,
and HDMI 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 Main B/D
Replace
Module
Module
Screen
normal?
End
Established
date
Revised date
6/14
LCD TV
Error
symptom
Standard Repair Process
☞A7
☞ A8/ A9
Check Test pattern
N
2013. 01 .09
B. Power error
No power
Power LED
On?
Y
N
DC Power on
by pressing Power Key
On Remote control
by pressing Power Key
On Remote control
Y
N
Normal
operation?
Check Power
On ‘”High”
On ‘”High”
Check Power cord
was inserted properly
was inserted properly
Check
Power LED
Power LED
Replace
Power
B/D
Power
B/D
Measure voltage of each output of Power B/D
N
Y
Normal
voltage?
Replace Main B/D
Y
OK?
Replace Main B/D
N
Y
Normal?
Check ST-BY 3.5V
Replace Power B/D
N
Y
Normal
voltage?
Replace Power
B/D
B/D
Y
☞A11
☞A12
☞A13
☞A4
Standard Repair Process
Established
date
Revised date
7/14
LCD TV
Error
symptom
. Stand-By: Red
※
Close
2013. 01 .09
B. Power error
Off when on, off while viewing, power auto on/off
Error?
N
Y
Check Power Off
Mode
Mode
Fix A/C cord & Outlet
and check each 3
phase out
and check each 3
phase out
Check A/C cord
Check for all 3- phase
power out
power out
Check outlet
Replace Main B/D
CPU
Abnormal
(If Power Off mode is
not displayed)
Check Power B/D
voltage
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
of Power B/D Part
☞A14
☞A13
Established
date
Revised date
8/14
LCD TV
Error
symptom
Standard Repair Process
Status
Power off List
Explanation
Normal
"POWEROFF_REMOTEKEY"
Power off by REMOTE CONTROL
"POWEROFF_OFFTIMER"
Power off by OFF TIMER
"POWEROFF_SLEEPTIMER"
Power off by SLEEP TIMER
"POWEROFF_INSTOP"
Power off by INSTOP KEY
"POWEROFF_AUTOOFF"
Power off by AUTO OFF
"POWEROFF_ONTIMER"
Power off by ON TIMER
"POWEROFF_RS232C"
Power off by RS232C
"POWEROFF_SWDOWN"
Power off by S/W Download
"POWEROFF_UNKNOWN"
Power off by unknown status except listed case
Abnormal
"POWEROFF_ABNORMAL1"
Power off by abnormal status except CPU trouble
"POWEROFF_CPUABNORMAL"
Power off by CPU Abnormal
* Please refer to the all cases which
can be displayed on power off mode.
can be displayed on power off mode.
Abnormal
1
2013. 01 .09
No audio
Screen normal
Screen normal
Check user
menu >
Speaker off
menu >
Speaker off
Off
N
Y
Cancel OFF
Check audio B+ 24V
of Power Board
of Power Board
Normal
voltage
voltage
Y
N
Replace Power Board and repair parts
Check Speaker
disconnection
disconnection
N
Y
Replace Speaker
Replace MAIN Board
End
C. Audio error
No audio/ Normal video
☞A15
☞A16
Disconnection
Established
date
Revised date
9/14
LCD TV
Error
symptom
Standard Repair Process
2013. 01 .09
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