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DOWNLOAD LG 42LW5500-ZE / 42LW550T-ZE / 42LW550W-ZE / 42LW551C-ZE / 42LW5590-ZE (CHASSIS:LD12C) Service Manual ↓ Size: 9.69 MB | Pages: 70 in PDF or view online for FREE

Model
42LW5500-ZE 42LW550T-ZE 42LW550W-ZE 42LW551C-ZE 42LW5590-ZE (CHASSIS:LD12C)
Pages
70
Size
9.69 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lw5500-ze-42lw550t-ze-42lw550w-ze-42lw551c-ze-42.pdf
Date
PREV: LG 42LW5500-CA (CHASSIS:LC12C) Service Manual

LG 42LW5500-ZE / 42LW550T-ZE / 42LW550W-ZE / 42LW551C-ZE / 42LW5590-ZE (CHASSIS:LD12C) Service Manual ▷ View online

Normal 
audio
Y
N
Move to No 
video/No audio
No video
Normal audio
Check Back Light
On with naked eye
On
Y
N
Check Power 
Board
12v,3.5v  etc.
Normal 
voltage
Y
N
Replace T-con 
Board or module
And Adjust VCOM
Repair Power 
Board or parts
Check Power Board 24v output
Normal
voltage
Y
Replace Inverter 
or module
N
Repair Power 
Board or parts
End
Always check & record S/W Version and White 
Balance value before replacing the Main Board
Replace Main Board 
Re-enter White Balance value
※Precaution
Established
date 
Standard Repair Process
Revised date 
1/14
LCD  TV
Error
symptom
A. Video error
No video/ Normal audio 
☞A4
☞A1
☞A2
☞A28
☞A7 & A3
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
1
2010. 12 .14
Normal
voltage?
Check various 
voltages of Power 
Board ( 3.5V,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 
☞A4
Established
date 
Revised date 
2/14
LCD  TV
Error
symptom
2
2010. 12 .14
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→ Set up→ Support → Signal Test )
- 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 
3/14
LCD  TV
Error
symptom
3
2010. 12 .14
A. Picture Problem (DVB-S/S2)
Tuning fail, Picture broken/ Freezing
Y
N
☞ A6
Check RF Signal level
Normal 
Signal?
Check
S/W Version
S/W Upgrade
SVC 
Bulletin?
Normal 
Picture?
Y
N
Y
Close
Check RF signal cable (DVB satellite signal or not)
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ Set-Top-Box, Different maker TV etc
Y
Change satellite setting
(match with installed ANT) 
N
Normal 
Picture?
Y
Close
N
☞ A7
Standard Repair Process
Established
date 
Revised date 
4/14
LCD  TV
Error
symptom
4
2011. 01 .24
Check satellite setting.
-
Check LNB frequency.
-
Check satellite  
-
Check Satellite connection
(DiSEqC, motor, etc…)
Normal 
setting?
Contact with 
signal distributor
or broadcaster 
(Cable or Air) 
Close
N
Check
Tuner soldering
Replace
Main B/D
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