Help with SFF Compaq Power Supply

**greenglo** · 02-09-2004, 08:43 PM

Hi, I have a compaq sff deskpro that I'm going to use for a carputer. Here is a picture of the case http://cgi.ebay.ca/ws/eBayISAPI.dll?...ayphotohosting. The model number is DPENS-P300/3.2/W5 US. My problem is that I want to connect my DC-DC power supply to the mobo, and it has a proprietary atx connector. The power connector to the motherboard has 14 pins. I looked on the internet and skimmed the mp3car archive but couldn't come to any conclusion. If anybody has any ideas I'd be very appreciative.

**greenglo** · 02-09-2004, 09:35 PM

I found a thread on the internet about a guy who wants to use the 14pin compaq power supply for a standard 20 pin atx mobo. Exact opposite of me. I'm just looking into which pins on the 14 correspond to the pins on the 20. Damn colours.

http://www.computer-chat.com/homebui...bo_293028.html

**greenglo** · 02-11-2004, 07:13 PM

So i tried the pin layout as posted by petemal2000:

pin one is the one on the bottom left.

1 = 3.3v (says 3.5 on the diagram but should be ok)
2 = 3.3v sense (probably wont need this)
3 = Ground
4 = 5v
5 = Ground
6 = 5v
7 = Ground
8 = 3.3v
9 = -12v
10 = Fans off ( probably wont need this one either)
11 = PS On ( wont need this)
12 = 5v aux ( im guessing this is the standby power, just connect it to 5v)
13 = Power good????
14 = 12v

I get the following results:

1. Power light on motherboard comes on
2. Pressing power button results in a click over the computer speaker (no power light)
3. After pressing the power button a few times I could smell something burning from around the computer speaker.

I could use a little help. Thx

By the way I am powering this with a Pw-70a.

**Ashsoft** · 06-11-2005, 06:11 AM

Greenglo,

I have just fit a M1-ATX DC-DC PSU to a Compaq EN SFF. Have a look at the pdf's it shows how i did it. I had to invert the PS-On signal from the MB because Compaq use positive logic to enable the PSU.

Les