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Wilky
(@wilky)
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Joined: 2 weeks ago
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Hey folks, Wilky here, came by this forum via youtube then the website and building an atx pc psu into a bench unit which did not work as such. Followed the instructions but am only getting 10+v off the 12v and 4+v off the 5v.

The power supply is a Foxconn HH-450EBTA and I have an 18ohm 10w resistor on the 5v side as per the instructions, any ideas greatly appreciated.

cheers Wilky

I do but probably shouldn't!


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Will
 Will
(@will)
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Joined: 5 months ago
Posts: 817
 
Posted by: @wilky

Hey folks, Wilky here, came by this forum via youtube then the website and building an atx pc psu into a bench unit which did not work as such. Followed the instructions but am only getting 10+v off the 12v and 4+v off the 5v.

The power supply is a Foxconn HH-450EBTA and I have an 18ohm 10w resistor on the 5v side as per the instructions, any ideas greatly appreciated.

Is that 10V and 4V read directly off the Foxconn leads or off the output jacks from the front panel ?


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Wilky
(@wilky)
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Joined: 2 weeks ago
Posts: 5
Topic starter  

@will what I have done is cut all but 3 12v side wires out, same with the ground and same with the 5v side plus used the resistor. On the 12v side I have a single plug to power up an lcd screen controller board and on the 5v side I connected a usb socket so I could run usb fans etc. I have measured the voltage from the cables and from the fittings and still get the same result.

Cheers Wilky

I do but probably shouldn't!


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Will
 Will
(@will)
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@wilky 

I can't find any diagrammatic representation of what power leads there are for the Foxconn HH-450EBTA. What I want to know is whether the observed voltages were measured from the ground and leads directly on the Foxconn.

In other words, if the voltages are wrong on the Foxconn, there's no future for the rest of the supply you're trying to make.


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Wilky
(@wilky)
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Joined: 2 weeks ago
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Topic starter  

@will I have measured the V across the power and ground leads and the V from positive to ground on the case and on the board, all give me the same thing so yep I am figuring it might be good for the bin as well. Could be why the pc it was in stopped working as well. Thanks @will.

Cheers Wilky

I do but probably shouldn't!


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Will
 Will
(@will)
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Joined: 5 months ago
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@wilky 

Yeah, if that's the voltage at the source then it sounds like it's time to dig a hole for it 🙁

On the other hand, maybe it means that the PC can be restored to use with a new power unit.


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ronalex4203
(@ronalex4203)
Estimable Member
Joined: 1 year ago
Posts: 196
 

@wilky Is it standard ATX cables?

Screen Shot 2021 11 23 at 19.37.28

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ronalex4203
(@ronalex4203)
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Joined: 1 year ago
Posts: 196
 

@wilky Did you check each voltage across all 8 grounds, and while you are at it, make sure to test each voltage you care about, 5 x 5V, 2 x 12V, and a bunch of 3.3 that I don't think you are interested in. A bad main ground can explain low voltage, I would try finding that, follow each ground and case ground back to find some common point where there may be a loose or oxidized connector. Solution is tighten and/or clean/sand the connector.


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Wilky
(@wilky)
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Joined: 2 weeks ago
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Topic starter  

@ronalex4203 yes but all the connectors and such have all gone in the bin. Not fussed if it doesn't work though, psu boxes are easily come by, in fact I was given a pc today and figured I would use the psu out of it but I have gotten the pc working and it runs a treat using a linux live usb os.

Cheers Wilky

I do but probably shouldn't!


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Wilky
(@wilky)
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Joined: 2 weeks ago
Posts: 5
Topic starter  

@ronalex4203 ok ta for that, I will dig it back out of the junk pile and have another look at it, see what happens, cheers

I do but probably shouldn't!


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ronalex4203
(@ronalex4203)
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Joined: 1 year ago
Posts: 196
 

@wilky Let us know what the outcome is.


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