Blackmambra64 said:
I connected the wires and there is no power on.I am not sure if the
wires are connected properly because it doesn't show the proper
connection for this motherboard . I need someone who can show me step
by step too connect the wires .
Thanks
There are two power connectors. The manual Bob linked to, shows there
is a 2x10 main power connector. It is on the edge of the board, near
the two DIMM slots.
The second power connector, is for the processor. It is a 2x2 connector,
square in shape, and should have two yellow wires and two black wires.
The yellow wires carry +12V to the processor, while the black are ground.
The connector is labeled "12V ATX" in the picture, and is near the
five capacitors and the CPU socket.
The motherboard is a S478, and the chipset is SIS. So this board is
a few years old (about as old as the S478 board I'm using to type
this up).
To make the board work, you also need to wire up the power button
from the front of the computer case. It will connect to the PANEL
header. The PANEL header is labeled "Front Panel header" in the picture,
and is in the corner next to the SATA plugs. On the silk screen on
the motherboard (usually white lettering), you may see "FP1"
near it.
IDE-LED+ X X PLED+
IDE-LED- X X PLED-
GND X X PWRBTN# \___ Power button plug goes on these two
RESET X X GND / pins.
NC X
NC = No Connection
IDE-LED pair, takes a LED that will flash when the hard drive is
being accessed. On some motherboards, the LED may flash for IDE
and not SATA, or vice versa. Some designs don't manage to integrate
a flashing function, that works for all the hard drives.
RESET,GND connects to the Reset button on the front panel. It
isn't absolutely necessary to hook this up, but if you want to
reset the board at some point in time, then the pins are
available for the button.
PLED+,PLED- is for a power LED. The front of your computer case,
may have a couple LEDs on it, and you could use the one labeled
power for this. When the computer is in S3 Suspend To RAM, the
Power LED will blink once per second (at least on my board it
does). The Power LED should be on steady, when the computer is
running.
PWRBTN#,GND is for the power button. The "#" is a notation
that means the signal is active low. So when PWRBTN# is grounded,
that makes the signal active. (RESET should have been labeled
RESET#, but I see the Foxconn tech writer is a little slow.)
The power switches are not polarized. You can rotate the pin pair
if you want, without consequences.
The LEDs are polarized, but as Bob points out, they can be
reversed without damage. If the LED does not operate, then
turn off the power to the system, and reverse the cable.
It should work on the next try.
As conventions go, the four front panel cables mentioned above,
may have a wire color in common. They may all have a black
wire. Or they may all have a white wire. The common wire is
likely the (-) of the pair. So if the LED pins are not labeled,
try connecting the "common color" wire to the (-) of the pin
pair on the header.
If you hook up just the Power button, to that header, and
also connect the 2x10 and 2x2 connector for power, your
motherboard should start.
Note that, pin spacing on computer case front panel wiring,
varies. Computers from HP/Dell, that kind of pre-built
stuff, uses a pin spacing of 0.1". But some of my cases
here, on the computers I built, have larger spacing for
things like the SPKR cable. It is a four pin, with the
middle two holes unpopulated.
If the cables don't match up with the PANEL header, it is
possible to back the pin out of the plastic shroud, and move
it. There may be a tab on the side of the black plastic on
the end of the case wire, that when lifted a tiny bit, will
allow the pin to slide out backwards from the plastic. If
you see a problem with what you've got, just post back, and
there are some alternatives.
If you bought a new power supply, it may have a 24 pin connector
on it. Some 24 pin connectors, split into a 20 and a 4 pin section.
The 4 pin section is not used (don't connect it to the 2x2 ATX12
connector by accident!). The 4 pin section will have 4 different
wire colors. The ATX12V 2x2, on the other hand, has two yellow
and two black wires, so that is how you know you've got the
right one for the 2x2 near the processor.
If your 24 pin connector refuses to un-hinge and come apart, all
is not lost. The 20 pin section of the 24 pin, can be plugged to the
motherboard, and it is OK for the 4 excess pins to hang over the
edge. On some motherboards, there can be a capacitor that
gets in the way, and that is the final straw (you'd have to
find another power supply). But most gear these days, is
ready to accommodate issues like this, so I don't expect
a problem here. This picture shows a 24 pin supply, being
used with a 20 pin motherboard.
http://www.certtalk.com/kb/article_images/702/fig-6.gif
HTH,
Paul
