DOWNLOAD LG 22LH250C (CHASSIS:LD91Z) Service Manual ↓ Size: 6.95 MB | Pages: 76 in PDF or view online for FREE

Model
22LH250C (CHASSIS:LD91Z)
Pages
76
Size
6.95 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
22lh250c-chassis-ld91z.pdf
Date
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Normal
voltage?
Check various 
voltages of Power 
Board ( 5V,12V,20V 
or 24V…)
No Video/
No audio
Check and 
replace 
MAIN B/D
Y
Replace Power 
Board and repair 
parts
N
End
Standard Repair Process
A. Video error
No video/ No audio 
☞A5
Established
date 
Revised date 
2008. 3 .05
2/13
LCD  TV
Error
symptom
2
A. Picture Problem
Picture broken/ Freezing
Y
N
☞ A6
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→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
☞ A7
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
Y
N
Replace Main B/D
Color
error?
Check error 
color input 
mode
Check color by input
-External Input
-COMPONENT
-RGB
-HDMI/DVI
Y
External device
/Cable
normal
External Input/
Component
error
Check 
external 
device and
cable
Y
External device
/Cable
normal
RGB/
HDMI/DVI
error
Check external 
device and 
cable
Replace Main B/D
Replace Main B/D
N
N
A. Video error
Color error 
☞A8
N
Y
End
Replace module
Request repair 
for external 
device/cable
Replace 
T-Con 
Board
And Adjust
VCOM
N
Y
Color
error?
LGD Module
Only
Other Module
Color
error?
Check Test pattern
☞A12
☞ A10/ A11
☞ A27
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
Y
N
Check and 
replace Link 
Cable
Normal?
Y
N
Screen
normal?
Replace Main B/D
Replace 
module
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
End
Vertical/Horizontal bar, residual image, light spot
Request repair 
for external 
device
A. Video error
Vertical / Horizontal bar, residual image, 
light spot, external device color error 
☞A16
External device screen error-Color error
External 
Input
error
Connect other external 
device and cable
(Check normal operation of 
External Input, Component, 
RGB and HDMI/DVI by 
connecting Jig, pattern 
Generator ,Set-top Box etc. 
N
Y
Replace 
Main B/D
Screen
normal?
Check screen 
condition by 
input
-External Input
-Component
-RGB
-HDMI/DVI
Request repair for 
external device
Component
error
RGB
error
HDMI/
DVI
Connect other external 
device and cable
(Check normal operation of 
External Input, Component, 
RGB and HDMI/DVI by 
connecting Jig, pattern 
Generator ,Set-top Box etc. 
Replace 
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
LGD Module Only
Replace
Module
Other Module
Replace module
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
☞A13
☞ A14/ A15
Check Test pattern
☞ A27
5
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