D
D.Rider
- Jan 1, 1970
- 0
I want to install a lower wattage power supply to an AT motherboard
and found this post (below) from way back (2002-04-01). What do I do
with the 3.3v and other stuff I don't need for the board? Will it run
without those connected or loaded? Thanks.
Here's the post:
AT power supplies used to come with a hard on/off switch. Most ATX
power
supplies are missing this switch. The main board connector is also
very
different. See below. (You have to use a typewriter font to see it
clearly,
I used Courier.)
STANDARD PC MOTHERBOARD CONNECTORS
Main Board (System PCB) Standard DC Power Connector(s)
O Y
r e B B B B W
a l B l l l l h
n R l l a a a a i R R R
g e o u c c c c t e e e
e d w e k k k k e d d d
____________ ____________
| P8 | | P9 |
------------ ------------
Wire Color Assignment
Black ------------------------------- Ground
Orange -------------------------- Power Good (+5V DC)
Red ---------------------------------- +5 VDC
White --------------------------------- -5 VDC
Yellow ------------------------------- +12 VDC
Blue -------------------------------- -12 VDC
Note!! When installing the P8/P9 connector be sure that the four
black wires are adjacent to each other in the center of the
connector.
The Red and Orange wires are on the outside edge of the
connector.
ATX 20 pin power connector
Pin# Pin#
-----------------------
| 3.3V 11 1* 3.3V |
| -12V 12 2 3.3V |
| COM 13*(Gnd) 3 COM |
| PS-ON 14* 4 +5V |
| COM 15 5 COM |
| COM 16 6 +5V |
| COM 17 7 COM |
| -5V 18 8 PW-OK|
| +5V 19 9 5VSB |
| +5V 20 10 +12V |
--------------------------
* NOTE!! On ATX supplies the power supply on/off functions are
controlled
thru the motherboard connector.
See pins 1, 13 and 14 for 3.3V, GND and power on signal.
Peripheral DC Power Connector
Y
B B e
l l l
R a a l
e c c o
d k k w
Wire Color Assignment
Red ------------------------------- +5 VDC
Black ------------------------------ Ground
Yellow ----------------------------- +12 VDC
The ATX power supply is switched on by connecting pin 14 to pin 13.
This and
more information about PC-connectors can be found in
[email protected]-web.net
Pieter Kralt
and found this post (below) from way back (2002-04-01). What do I do
with the 3.3v and other stuff I don't need for the board? Will it run
without those connected or loaded? Thanks.
Here's the post:
helpwhat is the difference between at and atx power supplies?thanks for your
AT power supplies used to come with a hard on/off switch. Most ATX
power
supplies are missing this switch. The main board connector is also
very
different. See below. (You have to use a typewriter font to see it
clearly,
I used Courier.)
STANDARD PC MOTHERBOARD CONNECTORS
Main Board (System PCB) Standard DC Power Connector(s)
O Y
r e B B B B W
a l B l l l l h
n R l l a a a a i R R R
g e o u c c c c t e e e
e d w e k k k k e d d d
____________ ____________
| P8 | | P9 |
------------ ------------
Wire Color Assignment
Black ------------------------------- Ground
Orange -------------------------- Power Good (+5V DC)
Red ---------------------------------- +5 VDC
White --------------------------------- -5 VDC
Yellow ------------------------------- +12 VDC
Blue -------------------------------- -12 VDC
Note!! When installing the P8/P9 connector be sure that the four
black wires are adjacent to each other in the center of the
connector.
The Red and Orange wires are on the outside edge of the
connector.
ATX 20 pin power connector
Pin# Pin#
-----------------------
| 3.3V 11 1* 3.3V |
| -12V 12 2 3.3V |
| COM 13*(Gnd) 3 COM |
| PS-ON 14* 4 +5V |
| COM 15 5 COM |
| COM 16 6 +5V |
| COM 17 7 COM |
| -5V 18 8 PW-OK|
| +5V 19 9 5VSB |
| +5V 20 10 +12V |
--------------------------
* NOTE!! On ATX supplies the power supply on/off functions are
controlled
thru the motherboard connector.
See pins 1, 13 and 14 for 3.3V, GND and power on signal.
Peripheral DC Power Connector
Y
B B e
l l l
R a a l
e c c o
d k k w
Wire Color Assignment
Red ------------------------------- +5 VDC
Black ------------------------------ Ground
Yellow ----------------------------- +12 VDC
The ATX power supply is switched on by connecting pin 14 to pin 13.
This and
more information about PC-connectors can be found in
[email protected]-web.net
Pieter Kralt