LG 26LU5000 / 26LU5010 / 26LU5020 (CHASSIS:LD91A) Service Manual ▷ View online
A. Picture Problem
Picture broken/ Freezing
Y
N
N
Check RF Signal level
Normal
Signal?
Check RF Cable
Connection
1. Reconnection
2. Install Booster
Check
S/W Version
Booster menu
On
Off: Check
Off
On: Check
S/W Upgrade
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
DVD Player ,Set-Top-Box, Different maker TV etc`
SVC
Bulletin?
Replace
Main B/D
Check
Tuner soldering
Normal
Picture?
Y
N
Y
Close
Normal
Picture?
Y
Close
Menu
Setup
Booster
. By using Digital signal level meter
. By using Diagnostics menu on OSD
( Menu
. By using Diagnostics menu on OSD
( Menu
Setup
Diagnostic)
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Normal
Picture?
Y
Contact with signal distributor
or broadcaster (Cable or Air)
N
N
Normal
Picture?
Y
Close
N
Standard Repair Process
Established
date
Revised date
2008. 3 .05
3/13
LCD TV
Error
symptom
3
Color
error?
Y
N
Check
and replace
Link Cable
(LVDS) and
contact
condition
Link Cable
(LVDS) and
contact
condition
Y
N
Replace Main B/D
Color
error?
Check error
color input
mode
color input
mode
Check color by input
-External Input
-COMPONENT
-RGB
-HDMI/DVI
-External Input
-COMPONENT
-RGB
-HDMI/DVI
Y
External device
/Cable
normal
External Input/
Component
error
Check
external
device and
cable
external
device and
cable
Y
External device
/Cable
normal
RGB/
HDMI/DVI
error
Check external
device and
device and
cable
Replace Main B/D
Replace Main B/D
N
N
A. Video error
Color error
N
Y
End
Replace module
Request repair
for external
device/cable
Replace
T-Con
Board
And Adjust
VCOM
T-Con
Board
And Adjust
VCOM
N
Y
Color
error?
LGD Module
Only
Other Module
Color
error?
Check Test pattern
Standard Repair Process
Established
date
Revised date
2008. 3 .05
4/13
LCD TV
Error
symptom
4
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
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
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
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 Only
Replace
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
Established
date
Revised date
2008. 3 .05
5/13
LCD TV
Error
symptom
Standard Repair Process
Check Test pattern
5
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
Check
Power LED
Power LED
Replace
Power
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?
Check ST-BY 5V
Replace Power B/D
N
Y
Normal
voltage?
Replace Power
B/D
B/D
Y
Standard Repair Process
Established
date
Revised date
2008. 3 .05
6/13
LCD TV
Error
symptom
’
09 years new model apply
mechanical power switch
to reduce power consumption in stand-by status.
If mechanical power switch off
Doesn’t turn on by remote control
Doesn’t appear LED light
Please refer to the A21 Page
6
. Stand-By: Red
. Operating: Green
Check & Repair
Mechanical Power switch
on Local control of TV
Close
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