LG 42LV3500 Service Manual page 94

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
For '11 models, there is no voltage out for st-by purpose.
When st-by, only 3.5V is normally on.
Edge LED PSU without LED Driver
Lamp PSU without inverter
Copyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Error
B. Power error _No power
Check power input voltage and ST-BY 3.5V
Established
date
Revised
date
Check the 3.5V when st-by
A18
2011. 2 .07
(Power Board ↔ Main Board)
24 Pin
FW20020-24SB (FOOSUNG)
1 Power on 2
3 20V (24V) 4
5 GND 6
7 GND 8
9 3.5V 10
11 3.5V 12
13 GND 14
15 GND 16
17 12V 18
19 12V 20
21 12V 22
23 N.C 24
A18
20V (24V)
20V (24V)
GND
GND
3.5V
3.5V
GND
GND
Inverter On/off
Lamp : A-Dim
PWM Dim #1
Error-out
LGE Internal Use Only