LG 42LN52XX / 42LN5200 / 42LN5204 (CHASSIS:LD36M) Service Manual ▷ View online
10 / 36
-
abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
C. Audio error
Wrecked audio/ discontinuation/noise
Wrecked audio/
Discontinuation/
Noise for
all audio
Check and replace
speaker and
connector
speaker and
connector
Wrecked audio/
Discontinuation/
Noise only
for D-TV
Wrecked audio/
Discontinuation/
Noise only
for Analog
Wrecked audio/
Discontinuation/
Noise only
for External Input
Connect and check
other external
device
other external
device
N
Y
Normal
audio?
Check and fix external device
Replace Adapter
N
Y
Normal
voltage?
Check input
signal
-RF
-External Input
signal
signal
-RF
-External Input
signal
Signal
normal?
(When RF signal is not
received)
Request repair to external
cable/ANT provider
received)
Request repair to external
cable/ANT provider
Y
Check DC24V
From Adapter
From Adapter
Replace Main B/D
(In case of
External Input
signal error)
Check and fix
external device
External Input
signal error)
Check and fix
external device
Replace Main B/D
N
End
Established
date
Revised date
10/14
LCD TV
Error
symptom
Standard Repair Process
☞A4
2013. 01 .09
☞A7
11 / 36
D. Function error
Remote control & Local switch checking
Y
N
- Remote control(R/C) operating error
Check R/C itself
Operation
Normal
operating?
Normal
operating?
Y
Close
Replace R/C
If R/C operate,
Explain the customer
cause is interference
from light in room.
Check R/C Operating
When turn off light
in room
Check & Replace
Baterry of R/C
Check & Repair
Cable connection
Connector solder
Connector solder
Normal
operating?
Check B+ 3.5V
On Main B/D
☞A16
Normal
Voltage?
N
N
Check 3.5V on Main B/D
Replace Adapter or
Replace Main B/D
(Adapter don’t have problem)
☞A4
Check IR
Output signal
Normal
Signal?
N
Y
Repair/Replace
IR B/D
N
☞A16
Replace
Main B/D
Y
☞A16
Standard Repair Process
Established
date
Revised date
11/14
LCD TV
Error
symptom
2013. 01 .09
Close
12 / 36
Check technical
information
- Fix information
- S/W Version
information
- Fix information
- S/W Version
N
Y
Technical
information?
Check
input
signal
input
signal
Signal
input?
input?
Y
N
External Input
Recognition error
Check and fix
external device/cable
external device/cable
HDMI/DVI
Recognition error
Replace Main B/D
Replace Main B/D
Fix in
accordance
with technical
information
D. Function error
External device recognition error
Established
date
Revised date
12/14
LCD TV
Error
symptom
Standard Repair Process
2013. 01 .09
13 / 36
Check
location of
noise
location of
noise
Identify
nose
type
nose
type
Circuit
noise
Replace Main B/D
Mechanical
noise
Check location of
noise
noise
※ When the nose is severe, replace the module
(For models with fix information, upgrade the S/W
or provide the description)
(For models with fix information, upgrade the S/W
or provide the description)
OR
※
If there is a “Tak Tak” noise from the
cabinet, refer to the KMS fix information and
then proceed as shown in the solution manual
(For models without any fix information,
provide the description)
then proceed as shown in the solution manual
(For models without any fix information,
provide the description)
OR
※ Mechanical noise is a natural
phenomenon, and apply the 1st level
description. When the customer does not
agree, apply the process by stage.
※ Describe the basis of the description
in “Part related to nose” in the Owner’s
Manual.
phenomenon, and apply the 1st level
description. When the customer does not
agree, apply the process by stage.
※ Describe the basis of the description
in “Part related to nose” in the Owner’s
Manual.
E. Noise
Circuit noise, mechanical noise
Established
date
Revised date
13/14
LCD TV
Error
symptom
Standard Repair Process
2013. 01 .09
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