Copyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
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
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