LG 32LT640E-TA (CHASSIS:LB2AF) Service Manual ▷ View online
Normal
audio
Y
N
Move to No
video/No audio
video/No audio
No video
Normal audio
Normal audio
Check Back Light
On with naked eye
On with naked eye
On
Y
N
Check Main Board
3.5V,12V,3.3V,
1.26V, 1.5V etc.
3.5V,12V,3.3V,
1.26V, 1.5V etc.
Normal
voltage
Y
N
Replace T-con
Board or module
Board or module
Repair Power
Board or parts
Board or parts
Check Power Board 24V,12V,3.5V output
Normal
voltage
voltage
Y
Replace Inverter
or module
or module
N
Repair Power
Board or parts
Board or parts
End
Always check & record S/W Version and White
Balance value before replacing the Main Board
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
※Precaution
Established
date
Standard Repair Process
Revised date
1/13
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
Normal
voltage?
Check various
voltages of Power
Board
( 3.5V,12V,20V or
24V…)
voltages of Power
Board
( 3.5V,12V,20V or
24V…)
No Video/
No audio
No audio
Check and
replace
MAIN B/D
replace
MAIN B/D
Y
Replace Power
Board and repair
parts
Board and repair
parts
N
End
Standard Repair Process
A. Video error
No video/ No audio
☞A4
Established
date
Revised date
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
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
Close
. By using Digital signal level meter
. By using Diagnostics menu on OSD
. By using Diagnostics menu on OSD
( Menu→Setup→Manual Tuning)
- Signal strength (Normal : over 30%)
- Signal Quality (Normal: over 30%)
- Signal Quality (Normal: over 30%)
Normal
Picture?
Y
Contact with signal distributor
or broadcaster (Cable or Air)
N
Normal
Picture?
Y
Close
N
Standard Repair Process
Established
date
Revised date
3/13
LCD TV
Error
symptom
3
N
Normal
Picture?
Y
Color
error?
Y
N
※ Check
and replace
Link Cable
(LVDS) and
contact
condition
and replace
Link Cable
(LVDS) and
contact
condition
Y
N
Replace Main B/D
Color
error?
Check error
color input
mode
color input
mode
Check color by input
-External Input
-COMPONENT
-External Input
-COMPONENT
-
RGB
-
HDMI/DVI
Y
External device
/Cable
normal
External Input/
Component
error
Check
external
device and
cable
external
device and
cable
Y
External device
/Cable
normal
RGB/
HDMI/DVI
error
Check external
device and
cable
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
Color
error?
Check Test pattern
Standard Repair Process
Established
date
Revised date
4/13
LCD TV
Error
symptom
4
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