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

B. Power error
No power
Power 
LED On?
Y
N
DC Power on
by pressing Power Key 
On Remote control
Y
N
Normal 
operation?
Check Power 
On ‘”High”
Check Power cord
was inserted properly
Check 
Power LED
Replace 
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?
Check ST-BY 3.5V
Replace Power B/D
N
Y
Normal
voltage?
Replace Power 
B/D
Y
A17
A18
A19
A4
Standard Repair Process
Established
date 
Revised date 
7/14
LCD  TV
Error
symptom
7
. Stand-By: Red
. Operating: white
Close
2010. 12 .14
B. Power error
Off when on, off while viewing, power auto on/off
Error?
N
Y
Check Power Off
Mode
Fix A/C cord & Outlet 
and check each 3 
phase out
Check A/C cord
Check for all 3- phase
power out
Check outlet
Replace Main B/D
CPU
Abnormal 
(If Power Off mode 
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
A22
A19
Established
date 
Revised date 
8/14
LCD  TV
Error
symptom
Standard Repair Process
8
Status
Power off List
Explanation
Normal
"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
"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
"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
*  Please refer to the all cases which
can be displayed on power off mode.
Abnormal 
1
2010. 12 .14
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
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