DOWNLOAD LG 42LW5500-ZE / 42LW550T-ZE / 42LW550W-ZE / 42LW551C-ZE / 42LW5590-ZE (CHASSIS:LD12C) Service Manual ↓ Size: 9.69 MB | Pages: 70 in PDF or view online for FREE

Model
42LW5500-ZE 42LW550T-ZE 42LW550W-ZE 42LW551C-ZE 42LW5590-ZE (CHASSIS:LD12C)
Pages
70
Size
9.69 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lw5500-ze-42lw550t-ze-42lw550w-ze-42lw551c-ze-42.pdf
Date

LG 42LW5500-ZE / 42LW550T-ZE / 42LW550W-ZE / 42LW551C-ZE / 42LW5590-ZE (CHASSIS:LD12C) Service Manual ▷ View online

No audio
Screen normal
Check user 
menu  > 
Speaker off
Off
N
Y
Cancel OFF 
Check audio B+ 
24V of Power 
Board
Normal
voltage
Y
N
Replace Power Board and repair parts
Check 
Speaker 
disconnection
N
Y
Replace Speaker 
Replace MAIN Board
End
C. Audio error
No audio/ Normal video  
A24
A25
Disconnection
Established
date 
Revised date 
9/14
LCD  TV
Error
symptom
Standard Repair Process
9
2010. 12 .14
→ 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
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
N
Y
Normal
audio?
Check and fix external device
Replace Power B/D
N
Y
Normal
voltage?
Check input 
signal
-RF
-External Input 
signal
Signal 
normal?
(When RF signal is not 
received)
Request repair to external 
cable/ANT provider
Y
Check audio 
B+ Voltage (24V)
Replace Main B/D
(In case of 
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
A25
10
2010. 12 .14
D. General Function Problem
Remote control & Local switch checking
Y
N
1. 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
Normal
operating?
Check B+ 
3.5V
On Main B/D
A27
Normal
Voltage?
Close
N
N
Check 3.5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
A4
Check IR
Output signal
Normal
Signal?
N
Y
Repair/Replace
IR B/D
N
A27
Replace
Main B/D
Y
A27
Standard Repair Process
Established
date 
Revised date 
11/14
LCD  TV
Error
symptom
11
2010. 12 .14
Check technical 
information
- Fix information
- S/W Version
N
Y
Technical 
information?
Check 
input 
signal
Signal
input?
Y
N
External Input and
Component
Recognition error
Check and fix 
external device/cable
RGB,HDMI/
DVI, Optical
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
12
2010. 12 .14
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