LG 19LD320 / 19LD320N (CHASSIS:LD91A) Service Manual ▷ View online
Color
error?
Y
N
Check
and replace
Link Cable
(LVDS) and
contact
condition
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
-RGB
-HDMI/DVI
-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
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
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
device
connection
condition
Y
N
Check and
replace Link
Cable
replace Link
Cable
Normal?
Y
N
Screen
normal?
Replace Main B/D
Replace
module
module
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
-External Input
-Component
-RGB
-HDMI/DVI
End
Vertical/Horizontal bar, residual image, light spot
Request repair
for external
device
for external
device
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
External device screen error-Color error
External
Input
error
Connect other external
device and cable
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
N
Y
Replace
Main B/D
Main B/D
Screen
normal?
Check screen
condition by
input
-External Input
-Component
-RGB
condition by
input
-External Input
-Component
-RGB
-HDMI/DVI
Request repair for
external device
external device
Component
error
RGB
error
HDMI/
DVI
Connect other external
device and cable
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
Replace
Main B/D
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
And Adjust VCOM
LGD Module Only
Replace
Module
Other Module
Replace module
in abnormal displaying
after exchanging T-Con B'd
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
B. Power error
No power
Power LED
On?
Y
N
DC Power on
by pressing Power Key
On Remote control
by pressing Power Key
On Remote control
Y
N
Normal
operation?
Check Power
On ‘”High”
On ‘”High”
Check Power cord
was inserted properly
Check
Power LED
Power LED
Replace
Power
Power
B/D
Measure voltage of each output of Power B/D
N
Y
Normal
voltage?
Replace Main B/D
N
Y
OK?
Replace Main B/D
N
Y
Normal?
Check ST-BY 5V
Replace Power B/D
N
Y
Normal
voltage?
Replace Power
B/D
B/D
Y
Standard Repair Process
Established
date
Revised date
2008. 3 .05
6/13
LCD TV
Error
symptom
’
09 years new model apply
mechanical power switch
to reduce power consumption in stand-by status.
If mechanical power switch off
Doesn’t turn on by remote control
Doesn’t appear LED light
Please refer to the A21 Page
6
. Stand-By: Red
. Operating: Green
Check & Repair
Mechanical Power switch
on Local control of TV
Close
B. Power error
Off when on, off while viewing, power auto on/off
Error?
N
Y
Check Power Off
Mode
Mode
Fix A/C code & Outlet
and describe 3 wave
and describe 3 wave
length
Check A/C code
Check for 3 wave length
Check outlet
Replace Main B/D
CPU
Abnormal
(If Power Off mode
is not displayed)
Check Power B/D
voltage
is not displayed)
Check Power B/D
voltage
Y
N
Replace Main B/D
Normal
voltage?
Replace Power B/D
Replace Power B/D
N
Y
Normal?
End
Caution
Check and fix exterior
of Power B/D Part
of Power B/D Part
Established
date
Revised date
2008. 3 .05
7/13
LCD TV
Error
symptom
Standard Repair Process
7
Status
Power off List
Explanation
Normal
"POWEROFF_REMOTEKEY"
Power off by REMOTE CONTROL
"POWEROFF_OFFTIMER"
Power off by OFF TIMER
"POWEROFF_SLEEPTIMER"
Power off by SLEEP TIMER
"POWEROFF_INSTOP"
Power off by INSTOP KEY
"POWEROFF_AUTOOFF"
Power off by AUTO OFF
"POWEROFF_ONTIMER"
Power off by ON TIMER
"POWEROFF_RS232C"
Power off by RS232C
"POWEROFF_RESREC"
Power off by Reservated Record
"POWEROFF_RECEND"
Power off by End of Recording
"POWEROFF_SWDOWN"
Power off by S/W Download
"POWEROFF_UNKNOWN"
Power off by unknown status except listed case
Abnormal
"POWEROFF_ABNORMAL1"
Power off by abnormal status except CPU trouble
"POWEROFF_CPUABNORMAL"
Power off by CPU Abnormal
* Please refer to the all cases which
can be displayed on power off mode.
can be displayed on power off mode.
Abnormal
1
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