LG 70LA8600-SA (CHASSIS:LJ34D) Service Manual ▷ View online
A. Video error
Color error
Standard Repair Process
Established
date
Revised date
5/14
LCD TV
Error
symptom
2012. 01 .14
☞
A7
A8/ A9
Color
error?
Y
N
※ Check and
replace Link
Cable
(LVDS) and
contact
Y
Replace Main B/D
Color
error?
Check color by input
-External Input
-COMPONENT
-RGB
HDMI/DVI
A7
Y
Replace module
Color
error?
☞
A8/ A9
N
condition
N
Check error
color input
mode
-HDMI/DVI
N
End
Y
External device
/Cable
normal
External Input/
Component
error
Check
external
device and
cable
Replace Main B/D
N
Check Test pattern
☞
A10
N
Request repair
for external
device/cable
Y
External device
/Cable
normal
RGB/
HDMI/DVI
error
Check external
device and
cable
Replace Main B/D
8 / 97
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Established
date
Revised date
6/14
LCD TV
Error
symptom
Standard Repair Process
2012. 01 .14
Vertical/Horizontal bar, residual image, light spot
light spot, external device color error
Replace
Module
☞
A7
Screen
normal?
N
Y
Check external
device
connection
condition
Y
N
Check and
replace Link
Cable
Normal?
Y
Screen
normal?
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
Y
N
Replace Main B/D
Screen
normal?
A7
☞
A8/ A9
N
N
Y
Replace
module
End
Request repair
for external
device
☞
A10
End
Check Test pattern
External device screen error-Color error
External
Check screen
condition by input
-External Input
Check S/W Version
N
Check
Input
error
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
N
Y
Replace
Main B/D
Screen
normal?
-Component
-RGB
-HDMI/DVI
Component
error
Check S/W Version
Y
N
Check
version
S/W Upgrade
Generator ,Set-top Box etc.
Request repair for
external device
RGB
error
Connect other external
device and cable
(Check normal operation of
Replace
Screen N
Y
pg
N
Normal
screen?
9 / 97
HDMI/
DVI
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
p
Main B/D
normal?
Y
End
B. Power error
No power
Standard Repair Process
Established
date
Revised date
7/14
LCD TV
Error
symptom
2012. 01 .14
Power LED
On?
Y
DC Power on
by pressing Power Key
N
Normal
operation?
Check Power
On ‘”High”
Check
Power LED
Replace
Power
Y
OK?
☞
A11
☞
A13
On?
N
y p
g
y
On Remote control
Y
operation?
On ‘”High”
Check Power cord
was inserted properly
Power LED
Power
B/D
Replace Main B/D
☞
A4
. Stand-By: Red
Measure voltage of each output of Power B/D
N
Y
Normal?
☞
A4
N
Y
Normal
voltage?
Replace Main B/D
Y
Check ST-BY 3.5V
R l
P
B/D
Y
Normal
voltage?
Y
☞
A12
※
Close
Replace Power B/D
N
Replace Power
B/D
B/D
10 / 97
B. Power error
Off when on, off while viewing, power auto on/off
Established
date
Revised date
8/14
LCD TV
Error
symptom
Standard Repair Process
2012. 01 .14
E
?
N
Check Power Off
Ch k A/C
d
Check outlet
CPU
Y
d
☞
A14
Error?
Y
Check Power Off
Mode
Check A/C cord
Check for all 3- phase
power out
Replace Main B/D
CPU
Abnormal
Replace Power B/D
N
Y
Normal?
End
Abnormal
1
Fix A/C cord & Outlet
and check each 3
phase out
(If Power Off mode
is not displayed)
Check Power B/D
l
Y
Replace Main B/D
Normal
voltage?
☞
A13
voltage
N
Replace Power B/D
※ Caution
Check and fix exterior
of Power B/D Part
Status
Power off List
Explanation
"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
* Please refer to the all cases which
can be displayed on power off mode.
Normal
"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
11 / 97
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
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