LG LST-4200A Service Manual - Page 46

Board-to-Board Connection, MAIN Board

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Whole Block Diagram 1. WHOLE BLOCK DIAGRAM - 1 Board-to-Board Connection AC220V SMPS Board 1 PWR_CTRL 1 2 30V 2 3 GND 3 4 12V 4 5 9V 5 6 GND 6 7 5V 7 8 5V 8 9 3.3V 9 10 3.3V 10 11 GND 11 12 -28V 12 13 GND 13 14 FD(-)/-24V 14 15 FD(+)/-21.5V 15 MAIN Board GND IR_DATA DATA_RD DATA_WR CLK CS 5V GND GND - 28V FD(-)/- 24V FD(+)/- 21.5V 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 FRONT Board 3-37 3-38

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Whole Block Diagram
1. WHOLE BLOCK DIAGRAM - 1
Board-to-Board Connection
FRONT Board
MAIN Board
SMPS
Board
15
FD(+)/-21.5V
15
14
FD(-)/-24V
14
13
GND
13
12
-28V
12
11
GND
11
10
3.3V
10
9
3.3V
9
8
5V
8
7
5V
7
6
GND
6
5
9V
5
4
12V
4
3
GND
3
2
30V
2
1
PWR_CTRL
1
12
11
10
9
8
7
6
5
4
3
2
1
GND
IR_DATA
DATA_RD
DATA_WR
CLK
CS
5V
GND
GND
- 28V
FD(-)/- 24V
FD(+)/- 21.5V
12
11
10
9
8
7
6
5
4
3
2
1
AC220
V
3-37
3-38