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-   -   XFX 750w electrical sheme and problem (https://www.overclock.net/forum/31-power-supplies/1733208-xfx-750w-electrical-sheme-problem.html)

geronimo 09-13-2019 02:05 AM

XFX 750w electrical sheme and problem
 
hi all.
can anyone give me some info where I could try to look for a electrical sheme for XFX 750w PSU (model: xps-750w-3xs)?

are there any PSUs that are very similar to that one? maybe seasonic?

It has a problem with turning on the PC. If it was unplugged from the wall socket, it needs around half minute to be able to switch on the PC. If the power supply is plugged in the wall socket, there is no problem in running.
As I understand it's a fault at the stand by power supply that is first in line (I don't know how to explain this in English exactly), a and my father who is electrician is trying to fix it. he changed a few electrolytes and capacitors already with no success.

https://postimg.cc/gr6YgVmf
https://postimg.cc/zyq8D4Kr
https://postimg.cc/XZzb8Jhj
https://postimg.cc/QFSsFSJW

thx.

shilka 09-13-2019 04:34 AM

Your PSU IS a Seasonic in fact its an M12D
The PSU is 10 years old so if its not working its not a huge surprise and its quite frankly a waste of time trying to repair it

geronimo 09-13-2019 04:54 AM

I wouldn't call it a waste of time for repair if the repair is more or less free and a joy for my dad.
I will not use it in my new machine but for a spare or in my old sandy that's currently under corsair vx450w (no gaming, just windows stuff and browsing).
thx for info.

shilka 09-13-2019 05:10 AM

As long as your dad knows what is doing and is being careful and you wont be using the PSU for a new system

geronimo 09-13-2019 05:12 AM

don't worry, he knows. problem is he asked me for electrical schematic of this PSU and I have no idea if or where I can try to search for this. google search doesn't give me anything good.

boombastik 09-13-2019 05:21 AM

The 5volt standby (5vsb) line seems to be the problem.
Usually 2 small capacitors.
sincerelly
Boombastik

shilka 09-13-2019 05:31 AM

Seasonic has rep here on OCN you could try and send him a PM asking for an M12D schematic

geronimo 09-13-2019 05:35 AM

Quote:

Originally Posted by boombastik (Post 28125778)
The 5volt standby (5vsb) line seems to be the problem.
Usually 2 small capacitors.
sincerelly
Boombastik

that's it.

@shilka , thanks

Sea Sonic Rep 09-13-2019 05:56 PM

Quote:

Originally Posted by shilka (Post 28125784)
Seasonic has rep here on OCN you could try and send him a PM asking for an M12D schematic

Hello,

Sorry, we do not provide such information as you may understand.

Thank you.
Best Regards,

TELVM 09-14-2019 12:18 PM

Quote:

Originally Posted by boombastik (Post 28125778)
The 5volt standby (5vsb) line seems to be the problem.
Usually 2 small capacitors.
sincerelly
Boombastik

^ This. Over the years electrolytic capacitors' ESR increases as they age. As ESR is at its highest when cold, sometimes they need to be warmed up to work properly:


A recap would solve the problem.

geronimo 09-30-2019 05:55 AM

my father fixed the PSU. the fault was in power module.
He changed out a few electrolytic capacitors that didn't fix the problem. after that there was one fishy resistor that he changed out and the PSU is fixed.
its NTC resistor 2,5ohm, 6.5v.

I hope this helps someone down the line. If you need details let me know. I'll be glad to help.

cheers.

Cerberus 09-30-2019 05:57 AM

nice!


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