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Chapter 13 Circuit Description; Power On/Off Signal Timing Sequence - Samsung HP-R5052 Service Manual

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13. Circuit Description

13-1 Power ON/OFF Signal Timing Sequence

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1. When connecting the AC power cord, Stand-By 5V from the Main SMPS is supplied to the Main Board (Pin 3 of CN1002 of Main
Board).
2. When pressing the Power button on the remote control or on the main body, PS_ON (Pin 5 of CN1002 of Main Board)
changes from High to Low.
3. If the PS_ON signal changes to Low, the Main SMPS supplies power to the Main Board and Logic Board, and Va and Vg power
is supplied to the DC-DC SMPS.
4. If the VS_ON signal from the Logic Board changes from Low to High, the Main SMPS supplies VS power to the X and Y Drive
Board through the DC-DC SMPS, and the screen displays a picture on it.
Samsung Electronics
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13-1
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