[EGropp]

I have a few power supplies from old Compaq EN450's.
Label says they are 200W supplies.
I followed the link to convert an ATX power supply (listed elsewhere in this forum). My power supply does not use the same colors for some of the values.
Here is what I think I have
Red +5 volt
Black ground
2 brown marked at 3.3v
1 brown unmarked
Orange +12V
Blue -12v
Purple fan-off
White SO?
Green 5VA grey Auxgnd

I have a 10ohm 10watt resistor connected to one red and one black wire.
I do not know which wire is the Sense wire that need to be tied to the 3.3v to make this thing come on.

I know the supply is good, it worked before I cut the ends off.

Any assistance would be greatly appreciated.
Thank you in advance
Eric

[Genguy]

If you still have the connectors that you cut off, they have terminal numbers on them. You can use the numbers to figure out what the function of each wire is. Here is a pinout diagram.

[EGropp]

This power supply has only one large connector.
Is seems to be close to an ATX power supply, but Compaq seems to do things thier own way.
I cannot seem to get this thing to power up now.

[Genguy]

I found this pinout posted on another forum. Maybe it will be closer to what you have.

[dertsap]

ive done it with a compaq but i can t remember 100%
if it has a green wire connect that wire to the black neg wire and it should power up

[davesaudio]

stolen from
http://www.hwkb.com/Uwe/Forum.aspx/h...in-motherboard

Quote--------------------------------------------------------

Another instance of "Proprietary hardware." Does anyone know the
>voltage or purpose of each lead on such a Compaq PS versus a standard
>PS? I was wondering if such a standard supply could be modified to the
>Compaq requirements? Such as the extra leads on a Compaq might simply
>be additional leads with an already existing voltage elsewhere on the
>standard PS (i.e +3.3 volts).

I tried modifying one once, did what seemed appropriate by connecting the
rails of a standard ATX to the proprietary Compaq wiring harness, but it
didn't work... I even supplied the Aux. 3VSB power (via a 2nd external
power supply) that theirs has but it STILL didn't work. I might've gotten
it to work if I had the Compaq motherboard too but I didn't, the fellow
with the system was hundreds of miles away.

Anyway, here's the pinout on the original unit I had, compared to a std
ATX. The terms such as "fan_sink" and "onstby" aren't standard terms but
were silkscreened onto the Compaq PSU PCB itself.

Pin # STD ATX 12V Compac 5320US

<1> +3.3 VDC +3.3 VDC Brown
<2> +3.3 VDC +3.3 VDC Brown
<3> COM COM Black
<4> +5VDC +5 VDC Red
<5> COM COM Black
<6> +5 VDC +5 VDC Red
<7> Com Aux Gnd (from aux board) Grey
<8> PWR ok N/C
<9> +5V SB +5 (from aux board) Turquoise
<10> +12 VDC +12 VDC Orange
---------------------------------------------------------------
<11.1> +3.3 VDC +3.3 (from aux board) Pink
<11.2> 3.3V sense
<12> -12 VDC Fan CMD White w/ Red Stripe
<13> COM +3.3 VDC Brown
<14> PS - On +5 VCD -12V? Blue (-12V)
<15> COM COM Black
<16> COM Power On White (ONSTBY)
<17> COM COM Black
<18> -5V COM Black (2nd wire, black
RTNRS)
<19> +5 VDC COM Black
<20> +5 VDC +3.3 VDC Brown
<21> ------ +5 VDC Red
<22> ------ +5 VDC Red
<23> ------ +3.3 VDC Sense Brown (3VRS)
<24> ------ Fan_sink White w/ Blue Stripe

[sandefuj]

It is the green wire that you connect to any of the black ones. But sometimes you have to put a load on them to get them to power up. Did you cut all the connectors off? If not just hook up an old hard drive or old CD ROM and I bet it powers up.

[dertsap]

Another instance of "Proprietary hardware." Does anyone know the
>voltage or purpose of each lead on such a Compaq PS versus a standard
>PS? I was wondering if such a standard supply could be modified to the
>Compaq requirements? Such as the extra leads on a Compaq might simply

i just upgraded my compaq power supply recently and there is a patch harness that comes with after market supplies
snap it in and go

[EGropp]

I tried to tie the green wire to a black wire and no good.
I have a 10ohm 10watt resitor between one of my red wires and one of the black wires. Still no go.

Dertsap.. You speak of a patch harness?
Where did you find that?

[dertsap]

I tried to tie the green wire to a black wire and no good.
I have a 10ohm 10watt resitor between one of my red wires and one of the black wires. Still no go.

Dertsap.. You speak of a patch harness?
Where did you find that?

it came with the new supply

[sandefuj]

I'm not sure if you need to use a red 5 volt or a red and yellow 12 volt. I know a hard drive will work I'm currently using one now that will only power on when I hook up a hard drive. Here is link that will maybe explain better.

http://www.directron.com/2powersupplies.html