Read LG 55LA7900 (CHASSIS:LA34D) Service Manual online
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. 12 .14
60LA86 : 18P
55LA86/55LA79 : 24P
24 Pin
(Power Board ↔ Main Board)
SMAW200-H24S
1
Power on
2
Inverter On/off
3
3.5V
4
PWM Dim #1
5
3.5V
6
PWM Dim #2
7
GND
8
GND
9
24V
10
24V
11
GND
12
GND
13
12V
14
12V
15
12V
16
24V
17
GND
18
GND
19
GND
20
GND
21
GND
22
L/DIMO_VS
23
L/DIM0_MOSI
24
L/DIM0_SCLK
18 Pin
(Power Board ↔ Main Board)
SMAW200-H18S
1
Power on
2
Inverter On/off
3
3.5V
4
PWM Dim #1
5
3.5V
6
PWM Dim #2
7
GND
8
GND
9
24V
10
24V
11
GND
12
GND
13
12V
14
12V
15
12V
16
24V
17
GND
18
GND
Click on the first or last page to see other 55LA7900 (CHASSIS:LA34D) service manuals if exist.