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#1
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Layout Power supply Deskpro EN
x-no-archive: yes
Hi all, i have a Compaq "Deskpro EN" Small Form Factor where the power supply does not work anymore. I like to use a standard ATX power supply for replace. But the Compaq power supply does only have 14 Pins instead of 20 like the ATX. Does anyone have the layout of the compaq power supply and can tell me, if it is possible to use a regular ATX ? Maybe i have to cut some pins - but which ones ;-) The ATX layout i have: Pin # STD ATX 12V 1 +3.3 VDC 2 +3.3 VDC 3 COM 4 +5VDC 5 COM 6 +5 VDC 7 Com 8 PWR ok 9 +5V SB 10 +12 VDC --------------------------------------------------------------- 11.1 +3.3 VDC 11.2 3.3V sense 12 -12 VDC 13 COM 14 PS - On 15 COM 16 COM 17 COM 18 -5V 19 +5 VDC 20 +5 VDC Thanks Bruno |
#2
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On Thu, 5 Feb 2004 14:09:19 +0100, "Bruno Keller"
wrote: x-no-archive: yes Hi all, i have a Compaq "Deskpro EN" Small Form Factor where the power supply does not work anymore. I like to use a standard ATX power supply for replace. But the Compaq power supply does only have 14 Pins instead of 20 like the ATX. Does anyone have the layout of the compaq power supply and can tell me, if it is possible to use a regular ATX ? Maybe i have to cut some pins - but which ones ;-) I don't understand why you would choose to not have this post archived... it's exactly the kind of info that would be useful to someone in the future, unlike many of the frivolous conversations that take place on usenet. Anyway, you need to take a look at your dead power supply, note the wiring color and positions. At a minimum it supports 5V and 12V. Note the colors of those wires to the drive connectors... It's also very likely the ground is still black, but note that as well. Next match up the colors on the motherboard power connector... there's only a few things they may've likey done to reduce the pin count... either doing away with -5V, -12V, and a single 5V, 12V, and couple ground wires, or more likely, it doesn't use 3V power. It is most likely that it doesn't use 3V power, that it's essentially an AT power supply with an ATX-like connector. Check the chassis to determine whether it uses an AC power switch to the front bezel for power on/off, or not. The AC power switch is fairly obvious, it's much larger, has a thick electrical cord instead of small high-gauge wires. |
#3
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kony wrote:
"Bruno Keller" wrote: x-no-archive: yes i have a Compaq "Deskpro EN" Small Form Factor where the power supply does not work anymore. I like to use a standard ATX power supply for replace. But the Compaq power supply does only have 14 Pins instead of 20 like the ATX. Does anyone have the layout of the compaq power supply and can tell me, if it is possible to use a regular ATX ? Maybe i have to cut some pins - but which ones ;-) I don't understand why you would choose to not have this post archived... it's exactly the kind of info that would be useful to someone in the future, unlike many of the frivolous conversations that take place on usenet. I agree. In fact, my attitude to such an antisocial header is not to bother supplying any information I may have. Unfortunately too many newsreaders allow it to be included in the headers, and thus hide it on the newsgroups. -- Chuck F ) ) Available for consulting/temporary embedded and systems. http://cbfalconer.home.att.net USE worldnet address! |
#4
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I agree. In fact, my attitude to such an antisocial header is not
to bother supplying any information I may have. Unfortunately too sorry folks - i agree to. I didn't remark it as it was a "default" template where i'm using for posts in groups where the threads are not really important to keep them and fill up the usenet ;-) Bruno |
#5
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Thanks Kony
i found the wiring of the 14-pin supply Compaq Supply | Standard ATX 1 +3.3Vdc | 1 +3.3Vdc 2 +3.3V Sense | 2 +3.3Vdc 3 Signal GND | 3 Signal GND 4 +5Vdc | 4 +5Vdc 5 Signal GND | 5 Signal GND 6 +5Vdc | 6 +5Vdc 7 Signal GND | 7 Signal GND 8 +3.3Vdc | 8 PWR-OK 9 -12Vdc | 9 +5VSB 10 Fan Off | 10 +12Vdc 11 On/STBY | 11 +3.3Vdc / 3.3V Sense 12 +5V Aux | 12 -12Vdc 13 +3.3V Sense | 13 Signal GND 14 +12Vdc | 14 PS-ON 15 Signal GND 16 Signal GND 17 Signal GND 18 -5Vdc 19 +5Vdc 20 +5Vdc So, as i can see the pin 9 - 14 are different. How to connect ? ATX 12 to Cpq 14 ? ATX 11 to Cpq 13 ? ATX 19 to Cpq 12 ? ATX 14 to Cpq 11 ? ATX ?? to Cpq 10 ? ATX ?? to Cpq 9 ? thanks Bruno |
#6
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On Fri, 6 Feb 2004 08:06:45 +0100, "Bruno Keller"
wrote: Thanks Kony i found the wiring of the 14-pin supply Compaq Supply | Standard ATX 1 +3.3Vdc | 1 +3.3Vdc 2 +3.3V Sense | 2 +3.3Vdc 3 Signal GND | 3 Signal GND 4 +5Vdc | 4 +5Vdc 5 Signal GND | 5 Signal GND 6 +5Vdc | 6 +5Vdc 7 Signal GND | 7 Signal GND 8 +3.3Vdc | 8 PWR-OK 9 -12Vdc | 9 +5VSB 10 Fan Off | 10 +12Vdc 11 On/STBY | 11 +3.3Vdc / 3.3V Sense 12 +5V Aux | 12 -12Vdc 13 +3.3V Sense | 13 Signal GND 14 +12Vdc | 14 PS-ON 15 Signal GND 16 Signal GND 17 Signal GND 18 -5Vdc 19 +5Vdc 20 +5Vdc So, as i can see the pin 9 - 14 are different. How to connect ? ATX 12 to Cpq 14 ? No, that's -12V. ATX 10 to Cpq 14 ATX 11 to Cpq 13 ? Seems good. ATX 19 to Cpq 12 ? No, a standard ATX has more 5V leads than needed, you'll have to clip them off, desolder at PCB, whichever, but they wouldn't be connected... same goes for the unused GND (ground) leads. 5V Aux is "most likely" the always-on power to the motherboard, equivalent of the +5VSB on a standard ATX. ATX 9 to Cpq 12 ATX 14 to Cpq 11 ? Maybe? It might be that simple, but might not. The last proprietar Compaq supply I saw, had more than 14 pins, but wouldn't turn on when a standard ATX PS-On signal was substituted for the "On/STBY". It would've helped if I had the Compaq motherboard when I did that testing, since all I know for sure is that they did "something" odd... ATX 14 to Cpq 11 is the first thing I'd try though, failing any futher info. ATX ?? to Cpq 10 ? Cpq 10 would go used, as far as I know. ATX ?? to Cpq 9 ? ATX12 to Cpq 9 I can't guarantee that I'm right though, Compaq seems to go to extra efforts to thwart compatibility. |
#7
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thanks again.
just saw that Pin 8 is also different. 8 +3.3Vdc | 8 PWR-OK so i guess i do not have any 3.3 V. What happen when i take +5 (ATX 19 or 20) ATX 12 to Cpq 14 ? No, that's -12V. ups... yes, thanks a standard ATX PS-On signal was substituted for the "On/STBY". It is this eventually Pin 8 from the ATX ? I can't guarantee that I'm right though, Compaq seems to go to extra efforts to thwart compatibility. yep, and a reason to take 160$ for a new power supply ! (Price in switzerland). so, i try: ATX 10 to Cpq 14 ATX 11 to Cpq 13 ATX 9 to Cpq 12 ATX 14 to Cpq 11 Cpq 10 is not used ? btw: on the dead ps the color is purple (violet) ATX12 to Cpq 9 ATX?? to Cpq 8 Bruno |
#8
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On Fri, 6 Feb 2004 09:20:02 +0100, "Bruno Keller"
wrote: thanks again. just saw that Pin 8 is also different. 8 +3.3Vdc | 8 PWR-OK so i guess i do not have any 3.3 V. What happen when i take +5 (ATX 19 or 20) you're right, the ATX 8 should not be connected to Cpq 8. The ATX power supply has more 5V leads than the Compaq, so ATX19 and 20 may go unused, as i mentioned previously. ATX 12 to Cpq 14 ? No, that's -12V. ups... yes, thanks a standard ATX PS-On signal was substituted for the "On/STBY". It is this eventually Pin 8 from the ATX ? No, Cpq 11 to ATX 14. There is nowhere to connect ATX 8, it would also be unused. Again, I don't know if the replacement will work like this. It might be a good time to consider upgrading the motherboard, so you have a standard motherboard supporting a faster CPU, which will accept the standard ATX power supply. |
#9
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Tried it, on sereval ways.. no luck. No power.
Bruno |
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