DOWNLOAD LG 42LH3000 / 42LH3010 / 42LH3020 / 42LH3040 (CHASSIS:LD91A) Service Manual ↓ Size: 4.15 MB | Pages: 79 in PDF or view online for FREE

Model
42LH3000 42LH3010 42LH3020 42LH3040 (CHASSIS:LD91A)
Pages
79
Size
4.15 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh3000-42lh3010-42lh3020-42lh3040-chassis-ld91a.pdf
Date
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LG 42LH3000 / 42LH3010 / 42LH3020 / 42LH3040 (CHASSIS:LD91A) Service Manual ▷ View online

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 
Established
date 
Revised date 
2008. 3 .05
2/13
LCD  TV
Error
symptom
2
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
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
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 
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
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 
 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
Check Test pattern
5
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