DOWNLOAD LG 37LK450 / 37LK450A / 37LK450N / 37LK450U / 37LK455C (CHASSIS:LD01U) Service Manual ↓ Size: 9.25 MB | Pages: 99 in PDF or view online for FREE

Model
37LK450 37LK450A 37LK450N 37LK450U 37LK455C (CHASSIS:LD01U)
Pages
99
Size
9.25 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
37lk450-37lk450a-37lk450n-37lk450u-37lk455c-chassi.pdf
Date
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LG 37LK450 / 37LK450A / 37LK450N / 37LK450U / 37LK455C (CHASSIS:LD01U) Service Manual ▷ View online

Standard Repair Process Detail Technical Manual
Check front display LED
B. Power error _No power
A17
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
A17
ST-BY condition: Red
Power ON condition: white
Front LED control :
Menu 
Æ Option Æ Power Indicator
Æ Standby light ON
2010. 2 .19
Standard Repair Process Detail Technical Manual
Check power input voltage and ST-BY 3.5V
B. Power error _No power
A18
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
A18
Check the 3.5V when st-by
For ’11 models, there is no voltage out for st-by purpose. 
When st-by, only 3.5V is normally on.
2011. 2 .07
Edge LED PSU without LED Driver
Lamp PSU without inverter
24 Pin 
(Power Board ↔ Main Board)
FW20020-24SB (FOOSUNG)
1
Power on
2
20V (24V)
3
20V (24V)
4
20V (24V)
5
GND
6
GND
7
GND
8
GND
9
3.5V
10
3.5V
11
3.5V
12
3.5V
13
GND
14
GND
15
GND
16
GND
17
12V
18
Inverter On/off
19
12V
20
Lamp : A-Dim
21
12V
22
PWM Dim #1
23
N.C 
24
Error-out
Standard Repair Process Detail Technical Manual
Checking method when power is ON
B. Power error _No power
A19
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
A19
Check “power on” pin is high
2011. 2 .07
Edge LED PSU without LED Driver
Lamp PSU without inverter
24 Pin 
(Power Board ↔ Main Board)
FW20020-24SB (FOOSUNG)
1
Power on
2
20V (24V)
3
20V (24V)
4
20V (24V)
5
GND
6
GND
7
GND
8
GND
9
3.5V
10
3.5V
11
3.5V
12
3.5V
13
GND
14
GND
15
GND
16
GND
17
12V
18
Inverter On/off
19
12V
20
Lamp : A-Dim
21
12V
22
PWM Dim #1
23
N.C 
24
Error-out
Entry method
1. Press the IN-START button of the remote 
controller for adjustment
2. Check the entry into adjustment item 3
Standard Repair Process Detail Technical Manual
POWER OFF MODE checking method
B. Power error 
_Off when on, off whiling viewing
<ALL MODELS>
A22
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
A22
2011. 2 .07
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