LG 42PG20 Plasma TV-Turn-On-Start Up Sequence-Web[1]

50PG20/42PG20 50PG20/42PG20 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB

7

In Stand-By Primary side is 90V

AC In 1

5

AC Det.

8

In Run (Relay On) Primary side is 370V 12V/16V Regulators

Stand By 5V Reg

M5V (DC Voltage) To Y-SUS, then to Control PWB.

Vs Reg

Vs/Va (DC Voltage)

Va Reg

To Y-SUS, Z-SUS Va routed to X-PWBs

9

10

Stand By 5V

12V 16V See  Note1

3

M5V Reg

2

Turns on Red LED

5V Det.

Relay On

5

5

6

NOTE 1: 

6

M5V On

Vs On

7

9

50PG20 has 12V and 16V to Main at turn on. 42PG20 only has 16V.

12V 16V Video Audio

5V Reg

2

5

AC Det.

Turns on Green LED

At point 3 TV is in Stand-By state. Energy Star compliant. Less than 1 Watt

Relay On 5

Both LEDs On Looks Amber Resets Main Board 3

Microprocessor or BCM

Power Button

7 9

Remote Or Key 4