Checking Method When Power Is On - LG 55LA7400 Service Manual

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
Copyright ⓒ 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Error
B. Power error _No power

Checking method when power is ON

Established
Check "power on" pin is high
24 Pin (Power Board ↔ Main Board) -
SMAW200-H18S1 (YEONHO)
1 Power on
3.5V
3
3.5V
5
7 GND
9 24V
11 GND
13 12V
15 12V
17 GND
19 GND
21 GND
23 L/DIM0_MOSI
- 69/83 -
2012. 11 .30
date
Revised
date
공통
2 INV_ON
4 PDIM #1(PWM Dim #1)
PDIM #2(PWM Dim #2)
6
8 GND
10
12 GND
14
16
GND
18
20 GND
22 L/DIM0_VS
24 L/DIM0_SCLK
A19
24V
12V
12V
LGE Internal Use Only