Re: Delta DPS-400GB-1A Troubleshoot (xserve)
Time to bring my thread back!
Bought another spare broken psu off ebay.
Looks like its the same issue as the original. Going to replace all caps first thing.
What are some quality brands of capacitors?
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
The two that were closest to the transformer are labels as LTEC 100mF35v 4415D.
The rest are TAICON, the 10mF50v reads 0423(M) 105C(VF)
Here is what I was able to rescue from the trashcan....
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
Pics might take me a while. Supply is tucked back inside the server.
The caps didn't actually look bad, and seemed to test OK with my voltmeter. They must only go bad under load. There are 100micro25v on either side of the small transformer, another 100mF25v, a 10mF50v and a 47mF16v on the secondary side of the transformer that I replaced.
The primary switching mosfets were inactive during initial testing. There was some voltage on the output of the small transformer. On the scope...
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
Well I replaced all the caps near the smaller transformer and SUCCESS!!
PSU seems to be working just fine now. I have 12.18v on both outputs. It powers up the server fine. These supplies seem to be ON as soon as the cord is plugged in, which is probably why they burn out often.
Thanks for all the help!
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
614-0264 400w G5 PSU...
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
I resoldered the small transformer after a failed attempt to remove it.
The psu turned on! I could hear the buzzing and the relay click on.
I shut it off quickly so I could setup my voltmeter to test the output and when I turned it back on... nothing.....
Looking at the small transformer with the scope as toasty suggested, it appears as though it is trying to turn on, there is a ringing waveform about once a second, the big transformer is quiet.
I am going to start swapping...
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
Pictures of the board and components:...
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
This supply only has 2 +12v rails and nothing else. From what I can tell, one of the mosfets supplies power to the control circuits and seems to be working, while the other 2 mosfets switch the leads to the transformer which powers both 12v rails. according to the server manual there should be 12v on o e of the rails in a plugged in standby condition.
Thanks for the help. I am going to have to order the mosfets. Infineon seems to be the only people that make them with the specs I need.
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
Apparently these mosfets are obsolete.
They are Infineon Technologies 20n60c3 in a TO-247 package.
600v, 208watt, etc.
[url]https://cdn.badcaps-static.com/pdfs/cad029db5835d0b7bd185d10059ad10f.pdf[/url]
These should be able to be replaced with any standard mosfet with similar specs correct?Re: Delta DPS-400GB-1A Troubleshoot ...<br /> <br />
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Re: Delta DPS-400GB-1A Troubleshoot (xserve)
I do have 167v across the primary capacitor. I cannot find any bad caps, they all seem to charge, then open.
I will replace all the transistors and see where that gets me. They are 20N60C3. I have 3 total.
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Delta DPS-400GB-1A Troubleshoot (xserve)
I bought an xserve with a dead PSU thinking I could fix it.
Nothing is obviously burnt, it doesn't blow fuses, it has 0 volts output. The xserve manuals says it should have +12v on standby. According to the manuals there are 2 rails of +12v, and 3 IIC pins. No other voltage outputs.
I do have a HP 54501A 100mhz, and a voltmeter.
I am getting no output from the primary transformer. (the transformer between the mosfets and the output filters)
Measuring the input to the transformer, from earth, the scope shows -101.6vmin, 78.125vmax 179.7vpp,...
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