DOWNLOAD LG 42SL80YD-DA (CHASSIS:LT91T) Service Manual ↓ Size: 4.91 MB | Pages: 69 in PDF or view online for FREE

Model
42SL80YD-DA (CHASSIS:LT91T)
Pages
69
Size
4.91 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42sl80yd-da-chassis-lt91t.pdf
Date
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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,5v  etc.
Normal 
voltage
Y
N
Replace Main Board
Replace T-con 
Board or module
OR
Repair Power 
Board or parts
Check Power Board 20V or 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 
Electronics 6-3
Standard Repair Process
Revised date 
2008. 3 .26
1/13
LCD  TV
Error
symptom
A. Video error
No video/ Normal audio 
☞A3
☞A1
☞A2
☞A27
☞A7 & A4
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
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 
Electronics 6-3
Revised date 
2008. 3 .26
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
Check
S/W Version
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 
Electronics 6-3
Revised date 
2008. 3 .26
3/13
LCD  TV
Error
symptom
3
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