DOWNLOAD LG 55SL80YD-AA (CHASSIS:LB91T) Service Manual ↓ Size: 4.86 MB | Pages: 66 in PDF or view online for FREE

Model
55SL80YD-AA (CHASSIS:LB91T)
Pages
66
Size
4.86 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
55sl80yd-aa-chassis-lb91t.pdf
Date
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LG 55SL80YD-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 
No Video/
No audio
Check and 
replace 
MAIN B/D
Y
☞
A5
(
,
,
or 24V…)
No audio
MAIN B/D
Replace Power 
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
Check RF Signal level
y
g
g
( Menu→Setup→Diagnostic)
- Signal strength (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 
Y
Replace Main B/D
Color
error?
Check color by input
-External Input
-COMPONENT
-RGB
HDMI/DVI
A8
N
Y
Replace 
T-Con 
Board
N
Y
Color
error?
Color
error?
☞
A10/ A11
☞
A27
N
condition
N
Check error 
color input 
mode
-HDMI/DVI
N
End
N
Y
External device
/Cable
normal
External Input/
Component
error
Check 
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
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
Other Module
☞
A13
☞
A27
Screen
normal?
N
Y
Check external 
device
connection 
condition
Y
N
Check and 
replace Link 
Cable
Normal?
Y
N
Screen
normal?
Replace Main B/D
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
Y
N
Screen
normal?
A13
☞
A14/ A15
☞
A27
N
Y
Replace 
module
End
Request repair 
for external 
device
☞
A16
Replace module
End
Check Test pattern
External device screen error-Color error
External 
Check screen 
condition by input
-External Input
Check S/W Version
N
Check
p
in abnormal displaying
after exchanging T-Con B'd  
Input
error
Connect other external 
device and cable
(Check normal operation of 
External Input, Component, 
RGB and HDMI/DVI by 
connecting Jig, pattern 
N
Y
Replace 
Main B/D
Screen
normal?
-Component
-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
RGB
error
Connect other external 
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. 
p
Main B/D
normal?
Y
End
5
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