Re: Problem with PSU adapter

Posted on 2024-04-09, 06:57

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If the hole for the PSU that works with it is to large you can get a piece of flat metal and just drill some holes to make an adapter. I had to do that with a XW4600 HP workstation They are to small. Compaq PSU is larger. So even if I mount it somehow (holes do not match), there would be an empty …

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Re: Multimeter recommendation

Posted on 2024-04-08, 21:03

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

mkarcher wrote on 2024-04-08, 20:17: boby wrote on 2024-04-08, 20:09: Which brings me to one more feature I would like it to have, and that is that it has automatic value change. The usual name of that feature is "autorange" or "automatic range selection". Yes, thank you! Couldn't remember the word …

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Re: Multimeter recommendation

Posted on 2024-04-08, 20:09

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It doesn't need to be the cheapest one there is. Which brings me to one more feature I would like it to have, and that is that it has automatic value change. For example, if I set it to measure the resistance, it will automatically switch to micro Ohm, Ohm, or kilo Ohm depending on what the …

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Re: Problem with PSU adapter

Posted on 2024-04-08, 20:00

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, so I did everything you suggested and it is still the same, but there is a progress 😀 This time, when I power on the PC, CPU FAN spins for a bit longer and even PSU FAN starts spinning and then all turns off again, after, let's say 1.5 seconds.

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Re: Problem with PSU adapter

Posted on 2024-04-08, 19:20

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Should be correct, as those are the labels I found inside of PSU. Can't trace pin 20, as this yellow cable is thight with other cables and there is some glue on top of that so can't see what is written there. I will try without it first with the mods you wrote Thx a lot! Going to try now

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Re: Problem with PSU adapter

Posted on 2024-04-08, 17:42

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My current adapter is also straight-through. If it makes any difference, I found out that, I can plug the PSU to the board without adapter. Last 4 pins are not connected, but rest 20 are, so the adapter is fine for sure, as I have same result with it or without it. But I will measure it. Update1: So …

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Re: Problem with PSU adapter

Posted on 2024-04-07, 19:42

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Should I maybe use adapter like this, insted of the one from first post?

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Re: Problem with PSU adapter

Posted on 2024-04-07, 13:03

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Which one is 3.3VSB from my pinout? Should be the one labeled "ROSE 3VAUX", so pin 11. Also, make sure the one labeled "23: Thin Brown 3VRS" connects to the 3.3V rail on the adapter. "3VRS" probably means 3V Return Sense... i.e. sense wire for the 3.3V rail. Without it, the PSU may not start or the …

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Re: Multimeter recommendation

Posted on 2024-04-07, 11:30

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you all for comments. @momaka you are 100% correct. I did have such issues with my meter. Probe cable broke, brake in contact, etc. So you messure some voltage and it says zero volts, when you move the probe a bit, not a zero anymore. :/ I will consider everyone's suggestions. Thank you all, …

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Re: Multimeter recommendation

Posted on 2024-04-07, 09:09

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

pretty much anything these days is good enough! As for batteries Ive changed my 9v in both my meters about once every 5 years... unless you need something specific, yeah, just about anything these days is fine, they all use the same internal chips and stuff until you get to higher end stuff. Even …

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Re: Problem with PSU adapter

Posted on 2024-04-07, 08:47

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I also think the adapter should work. Just make sure the final result at the ATX end going to the motherboard does indeed omit the 3.3VSB and that all of the voltage rails are at their respective positions. The adapter route should also be much much easier than re-wiring the PSU or re-pinning the …

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Multimeter recommendation

Posted on 2024-04-06, 21:23

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My old multimeter died, so any recommendation what do buy? I do some basic massurements and don't need anything fancy. Not too expensive to. 🙂 What is important that it has some thin probes, so I can test some smaller components too. Would be nice if it can be charged, so I don't need to replace …

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Re: Problem with PSU adapter

Posted on 2024-04-06, 10:49

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

According to wikipedia this adapter should work just fine. If wires 11,12,23 & 24 are removed (they are remmoved in adapter) the rest of wires should perfectly match to what I have in compaq PSU. Am I wrong? Standard ATX PSU:

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Re: Problem with PSU adapter

Posted on 2024-04-06, 06:35

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So, can it be re-wired, using to the above info?

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Re: Problem with PSU adapter

Posted on 2024-04-05, 14:50

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is what I found: 1: Brown 3V 2: Brown 3V 3: Black GND 4: Red 5V 5: Black GND 6: Red 5V 7: Gray ? 8: Thin Purple FAN_ON 9: Green 5V AUX 10: Orange +12V 11: Rose 3VAUX 12: Thin Red-White FAN-CMD 13: Brown 3V 14: Blue: -12V 15: Black GND 16: Thin White ON-STBY 17: Black GND 18: Black GND 19: Black …

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Re: Problem with PSU adapter

Posted on 2024-04-05, 13:27

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

.. which still begs the question where (if anywhere) is the 3.3VAux rail? It is the rose wire, pin 11. I am in a process of marking all the wires I can, just opened the PSU Update: The rose wire is not connected to the board when using adapter, because pins 11,12, 23 & 24 are excluded on the …

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Re: Problem with PSU adapter

Posted on 2024-04-05, 12:23

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The PSU does appear to have standard output voltages - i.e. 3.3V, 5V, 12V, -5V, -12V, and 5VSB (5VAux). The only non-standard one I see is 3.3VAux... and that could be a problem, if it's going to the wrong pin. (In fact, if this rail is present, we need to get rid of it from the ATX connector, …

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Re: Problem with PSU adapter

Posted on 2024-04-05, 06:43

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can't confirm 100% by the picture of the PSU connector if the pinout is non-standard, since I need to see the color of the wires coming in the back... but from what I can make out from this one, it sure does look like a non-standard pinout. The picture of the label for sure suggests the PSU is from …

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Re: Problem with PSU adapter

Posted on 2024-04-04, 17:34

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't have the board any more, I gave it to a friend, this is why I am putting the other board in the case (also compaq). I still have one image of the old board.

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Re: Problem with PSU adapter

Posted on 2024-04-04, 13:26

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by boby

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think the Compaq Deskpro EN is from the era where Compaq were using the ATX connector but there are some differences in the pinout. That turning on then off is probably either a short or a lack of power-good signal. I could rewire the connector, but where to find correct schematic? Or even better …

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