LG 37SL80YD-AA (CHASSIS:LB91T) Service Manual ▷ View online
Standard Repair Process
A. Video error
No video/ No audio
Established
date
Revised date
2008. 3 .26
2/13
LCD TV
Error
symptom
Normal
voltage?
Check various
voltages of Power
Board ( 5V,12V,20V
voltages of Power
Board ( 5V,12V,20V
No Video/
No audio
No audio
Check and
replace
MAIN B/D
replace
MAIN B/D
Y
☞
A5
(
,
,
or 24V…)
No audio
MAIN B/D
Replace Power
Board and repair
Board and repair
t
N
End
parts
2
A. Picture Problem
Picture broken/ Freezing
Standard Repair Process
Established
date
Revised date
2008. 3 .26
3/13
LCD TV
Error
symptom
☞
A6
. By using Digital signal level meter
. By using Diagnostics menu on OSD
. By using Diagnostics menu on OSD
Check RF Signal level
y
g
g
( Menu→Setup→Diagnostic)
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
- Signal Quality (Normal: over 50%)
Y
N
Normal
Signal?
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ DVD Player ,Set-Top-Box, Different maker TV etc`
■
Menu→Setup →Booster
A7
N
Check RF Cable
Connection
1. Reconnection
Check
S/W Version
SVC
Bulletin?
Y
Normal
Picture?
Y
Close
p
Normal
Picture?
Y
N
N
☞
A7
S/W Upgrade
Check
Tuner soldering
Normal
Picture?
N
Contact with signal distributor
or broadcaster (Cable or Air)
Normal
Picture?
Y
N
Replace
Main B/D
Y
Close
Close
3
A. Video error
Color error
Standard Repair Process
Established
date
Revised date
2008. 3 .26
4/13
LCD TV
Error
symptom
☞
A8
Replace module
Other Module
A10/ A11
Color
error?
Y
N
※
Check
and replace
Link Cable
(LVDS) and
contact
Link Cable
(LVDS) and
contact
Y
Replace Main B/D
Color
error?
Check color by input
-External Input
-COMPONENT
-RGB
-External Input
-COMPONENT
-RGB
HDMI/DVI
A8
N
Y
Replace
T-Con
Board
T-Con
Board
N
Y
Color
error?
Color
error?
☞
A10/ A11
☞
A27
N
condition
N
Check error
color input
mode
color input
mode
-HDMI/DVI
N
End
N
Y
External device
/Cable
normal
External Input/
Component
error
Check
external
device and
cable
external
device and
cable
Replace Main B/D
N
Check Test pattern
☞
A12
N
Request repair
for external
device/cable
Y
External device
/Cable
normal
RGB/
HDMI/DVI
error
Check external
device and
cable
device and
cable
Replace Main B/D
4
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Established
date
Revised date
2008. 3 .26
5/13
LCD TV
Error
symptom
Standard Repair Process
Vertical/Horizontal bar, residual image, light spot
light spot, external device color error
Replace T-Con Board
Replace
Module
Module
Other Module
☞
A13
☞
A27
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
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
-External Input
-Component
-RGB
-HDMI/DVI
Y
N
Screen
normal?
A13
☞
A14/ A15
☞
A27
N
Y
Replace
module
module
End
Request repair
for external
device
for external
device
☞
A16
Replace module
End
Check Test pattern
External device screen error-Color error
External
Check screen
condition by input
-External Input
condition by input
-External Input
Check S/W Version
N
Check
p
in abnormal displaying
after exchanging T-Con B'd
after exchanging T-Con B'd
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
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
N
Y
Replace
Main B/D
Main B/D
Screen
normal?
-Component
-RGB
-HDMI/DVI
-RGB
-HDMI/DVI
Component
error
Check S/W Version
Y
N
Check
version
S/W Upgrade
Generator ,Set-top Box etc.
Request repair for
external device
external device
RGB
error
Connect other external
device and cable
device and cable
(Check normal operation of
Replace
Screen N
Y
pg
N
Normal
screen?
HDMI/
DVI
(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.
p
Main B/D
normal?
Y
End
5
Click on the first or last page to see other 37SL80YD-AA (CHASSIS:LB91T) service manuals if exist.