HP pavilion 502n Power Supply 1

[clapper62]

I have an HP pavilion 502n that will not power up.
It has a microATX power supply in it.
I have tried other known working supplies with no luck.

My question is the power supply in the PC has a 3 wire
connector that leads to the motherboard(2 black 1 green)
and my swapped out power supplies don't have this connector.

Do I need a power supply with this connector?
Does anyone know what the purpose of this connector is?

The 2 power supplies I have tried are regular 20 pin ATX supplies.

"There is no pleasure in having nothing to do; the fun is having lots to do and not doing it.
." - Andrew Jackson

 

[wahnula]

Do I need a power supply with this connector?

Absolutely! This helps power the CPU and is sometimes called a P4 plug, a four-pin square plug. It was added several years ago so your replacement must be quite old. Get a NEW power supply with matching main harness (20 or 24-pin) and that connector should be there.

When I disassembled my 1999 HP Brio I found a 90 watt (not a typo!) PSU...so I don't think the older HPs were very concerned with their PSUs.

Tony

 

[clapper62]

Thank you for the response.

I believe we may be talking about 2 different connectors
I have seen the 4 wire connectors that plug in near the CPU
(this PSU doesn't have that)

This is is a 3 wire connector (2 black wires 1 green wire)
all 3 pins in line that plugs in near the 20 pin connector.

"There is no pleasure in having nothing to do; the fun is having lots to do and not doing it.
." - Andrew Jackson

 

[wahnula]

Does it look like one end of this?

http://www.directron.com/p4atx.html

Is it shaped like a Molex connector (rectangle w/ angled ends)?

 

[kmcferrin]

I don't think that's it. I know the kinds of cables that clapper62 is referring to. HP has them in their SFF PCs. HP doesn't use standard motherboards or PSUs, so you'll probably have to get one from them (or one of their suppliers).

 

[clapper62]

Thanks but no,

as I said this is only a 3 conducter cable and the pins are in-line.



"There is no pleasure in having nothing to do; the fun is having lots to do and not doing it.
." - Andrew Jackson

 

[clapper62]

kmcferrin,

Do you know what the connector does?
Is it neccessary to have a PSU that has it for the computer to power up?


"There is no pleasure in having nothing to do; the fun is having lots to do and not doing it.
." - Andrew Jackson

 

[clapper62]

The problem is that I'm not sure whether the fault is the power supply or the motherboard and I'm trying to determine if the motherboard is good, should the computer power up with a PSU that doesn't have this connector?

Or do I need to get a PSU like the 1 in it to determine if it is the PSU?

I have never seen a connection like this.


"There is no pleasure in having nothing to do; the fun is having lots to do and not doing it.
." - Andrew Jackson

 

[mainegeek]

Clapper62,

That plug (2 black 1 green) is for the power supply fan.

 

[clapper62]

Thank you mainegeek for your reply,

The question is still there though

Should a regular ATX PSU without this plug, power an otherwise working PC?

"There is no pleasure in having nothing to do; the fun is having lots to do and not doing it.
." - Andrew Jackson

 

[mainegeek]

I would say yes. I took a Pavilion 511n from my PC graveyard. It has the same PS with the 2black 1green plug that goes to the PS Fan header on the mobo. I tried it with and with out it attached. It didn't matter as the PC powered on and booted fine and the PS fan spun regardless. I think this wire is for Power Management ie: sleep..suspend

I doubt that it is used to energize any other fan headers on the mobo and I haven't probed it for its voltage.

 

[clapper62]

Thanks mainegeek,

Well unfortunately that answers my question.
I suppose I have to think of the possibilty that the
motherboard is dead.

Thanks again


"There is no pleasure in having nothing to do; the fun is having lots to do and not doing it.
." - Andrew Jackson

 

[tf1]

You should be able to ID the PSU from the label attached. There should be plenty of sources from the Internet. eBay is often a good place to find OEM PSUs to fit HP PCs.


Regards: tf1