LG 32LV3700-ZC / 32LV370S / 32LV375G-ZC / 32LV375S-ZC / 32LV375W-ZC (CHASSIS:LD12B) Service Manual ▷ View online
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
-External Input
-Component
-
RGB
-
HDMI/DVI
Check Test mode
RGB screen
RGB screen
End
Vertical/Horizontal bar, residual image, light spot
Request
repair for
external
device
repair for
external
device
Established
date
date
Electronics 6-3
Standard Repair Process
Revised date
2008. 2 . 1
LCD TV
A. Video error
Vertical/Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
5/13
☞154
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
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
Generator ,Set-top Box etc.
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
Replace Main B/D
Screen
normal?
N
Y
Check S/W Version
Y
N
Check
version
S/W Upgrade
Y
N
Normal
screen?
End
Error
symptom
symptom
Established
date
date
Electronics 6-3
Standard Repair Process
Revised date
2008. 2 . 1
LCD TV
B. Power error
No power
6/13
Red lamp
display
Y
N
Check Power
On Key
operation
On Key
operation
Y
N
Normal
operation?
Check Power
On ‘”H”
On ‘”H”
Check AC cord
connection and
voltage
connection and
voltage
Check ST-BY
(Lamp)
(Lamp)
Replace
Power B/D
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
voltage?
Check ST-BY 3.5V
Check and fix outlet and power cord connected condition
Replace Power B/D
N
Y
Normal
voltage?
Replace Power
B/D
B/D
Y
☞158
☞159
☞160
☞160
☞161
※ For Pacific 2, operation display LED can be off even with ST-BY output of 3.5V
→ In this case, replace the Digital B/D instead of the Power Board
Error
symptom
symptom
Established
date
date
Electronics 6-3
Standard Repair Process
Revised date
2008. 2 . 1
LCD TV
B. Power error
Off when on, off while viewing, power auto on/off
7/13
Error?
N
Y
Check Power Off
Mode
Mode
Fix A/C code/Outlet
and describe 3 wave
length
and describe 3 wave
length
Check A/C code
Check for 3 wave length
Check outlet
Replace Main B/D
Key Time
Out
CPU
Abnormal
On 15
Minute
Reset Off mode
(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
Describe
situation
Not a problem
situation
Not a problem
※ If there is no
signal, it is the
15 min OFF
function
signal, it is the
15 min OFF
function
☞162~163
☞164
Error
symptom
symptom
No audio
Screen normal
Screen normal
Check user
menu item
Speaker off
menu item
Speaker off
Off
N
Y
Cancel OFF and describe
Check audio
B+24V of Power
Board
B+24V of Power
Board
Normal
voltage
voltage
N
Y
Replace Power
Board and
repair parts
Board and
repair parts
Check
Speaker
disconnection
Speaker
disconnection
N
Y
Replace Speaker
Replace MAIN Board
End
Established
date
date
Electronics 6-3
Standard Repair Process
Revised date
2008. 2 . 1
LCD TV
C. Audio error
No audio/Normal video
8/13
☞165
☞166
Disconnection
Error
symptom
symptom
Use Sound
Test Menu
Test Menu
Normal
Sound
Y
N
Check Input Signal
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