LG 42SL80YD-AA (CHASSIS:LB91T) Service Manual ▷ View online
D. General Function Problem
Remote control & Local switch checking
Standard Repair Process
Established
date
Revised date
2008. 3 .26
10/13
LCD TV
Error
symptom
Y
1. Remote control(R/C) operating error
Check R/C itself
Normal
Check & Repair
Normal
Check B+ 5V
☞
A27
Normal
N
Check IR
Normal
Y
☞
A27
Replace
Main B/D
Y
☞
A27
Y
N
Check R/C itself
Operation
Normal
operating?
Y
Check R/C Operating
Check & Replace
Cable connection
Connector solder
Normal
operating?
Check B+ 5V
On Main B/D
Normal
Voltage?
Close
Check 5v on Power B/D
☞
A20
Check IR
Output signal
Normal
Signal?
N
Repair/Replace
IR B/D
N
Normal
operating?
Close
If R/C operate,
Explain the customer
cause is interference
When turn off light
in room
Baterry of R/C
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
IR B/D
Replace R/C
cause is interference
from light in room.
N
2. Local(Mechanical) switch operating error
Y
Ch k R/C
N
l
Check & Repair
N
l
N
Check & Replace
Ch k K
N
l N
N
l
Replace
Main B/D
Y
Move
Y
N
Check R/C
Operation
Normal
operating?
Y
Check & Repair
Cable connection
Connector solder
Normal
operating?
Close
N
Check & Replace
Assembly status
(Key PCB + tool )
Check Key
Output signal
Y
Normal
operating?
Close
N
Normal
Signal?
Repair/Replace
N
Y
Move
Power problem
Section
p
p
Local switch B/D
10
D. Function error
External device recognition error
Established
date
Revised date
2008. 3 .26
11/13
LCD TV
Error
symptom
Standard Repair Process
Check technical
information
- Fix information
information
- Fix information
S/W Version
N
Technical
information?
Check
input
signal
input
signal
Signal
input?
input?
Y
External Input and
Component
Recognition error
Replace Main B/D
- S/W Version
Y
g
N
Check and fix
external device/cable
external device/cable
RGB,HDMI/
DVI, Optical
DVI, Optical
Recognition error
Replace Main B/D
Fix in
accordance
ith t h i l
with technical
information
11
E. Noise
Circuit noise, mechanical noise
Established
date
Revised date
2008. 3 .26
12/13
LCD TV
Error
symptom
Standard Repair Process
Check
location of
noise
location of
noise
Identify
nose
type
nose
type
Circuit
noise
Replace inverter
Replace LIPS B/D
OR
<With Inverter Module>
<Without Inverter Module>
Mechanical
noise
Check location of
noise
noise
※
When the nose is severe replace the module
※
When the nose is severe, replace the module
(For models with fix information, upgrade the
S/W or provide the description)
S/W or provide the description)
OR
※
If there is a “Tak Tak” noise from the
cabinet, refer to the KMS fix information and
※
Mechanical noise is a natural
phenomenon, and apply the 1st level
description. When the customer does not
agree apply the process by stage
description. When the customer does not
agree apply the process by stage
then proceed as shown in the solution manual
(For models without any fix information,
provide the description)
(For models without any fix information,
provide the description)
OR
agree, apply the process by stage.
※
※
Describe the basis of the description
in “Part related to nose” in the Owner’s
Manual.
Manual.
12
F. Exterior defect
Exterior defect
Established
date
Revised date
2008. 3 .26
13/13
LCD TV
Error
symptom
Standard Repair Process
Replace module
Zoom part with
exterior damage
exterior damage
Module
damage
Cabinet
damage
Replace cabinet
Replace remote controller
Remote
controller
damage
Stand
dent
Replace stand
13
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