ATX Power Supplies: An Overview Mon, Jan-07-2008
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Introduction:(28968 Reads)
Intel did away with the AT standard and it's two separate "P8" and "P9" connectors by making the main connection from the power supply to the motherboard a single piece. Enter ATX.

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ATX 20-pin connector


ATX 24-pin connector

Your PSU is "LIVE", but not "On".

An ATX power supply is always "live", even when it's "off", when it's plugged in and it's rear switch (if applicable) is switched on..

The +5V standby is always coursing through your motherboard whether your PC is on or not.  This is how the CMOS keeps it's settings with or without it's CMOS battery and wake on LAN, wake on ring and keyboard power on is accomplished. 


The power supply is instructed to energize the other power leads throughout the system when the "Power On" lead (the green wire on the main connector) is grounded.  Without grounding the green wire on the power supply, you will not be able to test ANY of the power leads on the power supply except for the +5V standby.


To test the power supply, you can do this: Unplug the power connector from the motherboard. Connect the green and black wires on the power connector with a paper clip or a piece of wire.  This will energize the power supply.  Now, using a multimeter, the 12V should read 12V, the 5V should read 5V and the 3.3V should read 3.3V (within +/- 5% per Intel specifications.)


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