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PC Power Supply Discussion Troubleshooting and discussion of computer power supplies

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  #61  
Old 04-19-2018
DAmio1st DAmio1st is offline
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Quote:
Originally Posted by Samueru Sama View Post
Thanks a lot.

The two MBR2045, are they placed back to back?

If yes those two should be the 12V rectifiers.

Each MBR2045 contains two diodes in parallel (4 in total), rated for 10A each, giving 40A total for the 12V (480W), which is what the unit specs for the 12V. Mmmmm. However they start derating at 60 degress.

That's an odd choice considering that one of the pics shows a MBRB3045CT, that one is rated for 30A.

Anyway, it is within spec (as long as the heatsink and fan are able to keep them under 60 degrees xd), however I'm used to see some safety margin here, for example the Evga 450BT has two 30A rectifiers for the 12V, and the unit is rated for 35A at 12V.

If you want, take a look at the other heatsink, that one is the primary side, this component is the mains bridge recitfier:


The rest under that heatsink should switching mosfets, and the PFC diode.

--------------------------------------

Edit: taking a closer look, the MBRB3045CT has another rectifier very closed to it (I assume it is the one you can't see):



Given how close they are to each other, it might be another MRB3045CT, it would make more sense. when you use diodes in parallel you need to use them thermally coupled to prevent one diode from having all the current going thru it, there are two ways to do this, one is placing each rectifier back to back in the heatsink, and another is placing them side by side very close.
That one you pointed to is the MBR2045, the last one I can't see is next to the MBR2045. These two MBR2045 are back to back. MBRB3045CT is the left most one, MBR2045 is in the middle, the right most one is the one I can't see.
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  #62  
Old 04-20-2018
Magic Smoke Magic Smoke is offline
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Quote:
Originally Posted by ashiekh View Post
I would be more worried about the capacitors

Does anyone know the TMX brand?
I think those are Asia'x TMX capacitors which appear to be made by JunFu.
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  #63  
Old 04-20-2018
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Good to know, many thanks

I remain impressed that the supply overloads gracefully, but with a fan running flat out all the time and these capacitors I am not sure it is a good deal; I'm too poor to buy cheap
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  #64  
Old 04-20-2018
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Quote:
Originally Posted by Samueru Sama View Post



Given how close they are to each other, it might be another MRB3045CT...
Unlikely as the LT top left is missing.
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  #65  
Old 04-20-2018
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Quote:
Originally Posted by Magic Smoke View Post
I think those are Asia'x TMX capacitors which appear to be made by JunFu.
AsiaX, JunFu and in the old days Fuhjyyu

And can someone verify that? Is that true?? Seems a bit odd...
https://www.urbandictionary.com/define.php?term=Fuhjyyu
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  #66  
Old 04-20-2018
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Nice catch! ;-)

Well that decides it for me, but I would never have got to this point without all the effort people have put in getting, inspecting and testing the units; other than the fan issue that was already noted on the Amazon reviews.

Last edited by ashiekh; 04-20-2018 at 02:23 PM.
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  #67  
Old 04-20-2018
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Quote:
Originally Posted by Stefan Payne View Post
And can someone verify that? Is that true?? Seems a bit odd...
https://www.urbandictionary.com/define.php?term=Fuhjyyu
Not even close.
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  #68  
Old 04-20-2018
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Quote:
Originally Posted by Stefan Payne View Post
And can someone verify that? Is that true?? Seems a bit odd...
http://capacitor.web.fc2.com/a.html#asiax

https://web.archive.org/web/20081209...sp?GuestID=183
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Last edited by Per Hansson; 04-22-2018 at 04:59 AM.
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  #69  
Old 04-20-2018
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Ok.. Results of the 1000W from the Chroma.....

+5VSB efficiency is HORRIBLE. 40 to 50% efficiency depending on load. That said, the ripple on the +5VSB is amazingly low (like < 10mV).

Hold up time failed miserably. < 10ms at 80% load. Of course, that was to be expected since the bulk caps are so small.

Voltage regulation is "ok".

Ripple noise suppression is quite good at < 20mV.

Efficiency is the biggest short coming. It's "almost" Bronze.
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  #70  
Old 04-20-2018
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Any idea yet where it actually comes from?
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