Fortron FSP-ATX-400PNF

[willawake]

I am using these for replacements in the office.



dual rail 12v which is not exactly what i need though







Passive pfc

[willawake]

Re: Fortron FSP-ATX-400PNF

[willawake]

Re: Fortron FSP-ATX-400PNF





jamicon, teapo, capxon





last one. 20+4 atx

[davmax]

Re: Fortron FSP-ATX-400PNF

I see this PS has plenty of Teapo caps and Jamicon 3300u 10V. I would be rather sus of the latter caps. The old trick of using low grade caps uprated from 6.3V to 10V.

[willawake]

Re: Fortron FSP-ATX-400PNF

The old trick of using low grade caps uprated from 6.3V to 10V.

well its a pretty common trick though, especially in PSUs.

[bgavin]

Re: Fortron FSP-ATX-400PNF

If one wanted to measure a PSU suspected of doing this, is it simply a matter of measuring the voltage across the cap in question while power is applied?

Or is there a surge voltage that isn't apparent with this method?

[willawake]

Re: Fortron FSP-ATX-400PNF

there is 3.3v, 5v and 12v rails, why would you need to measure?

[bgavin]

Re: Fortron FSP-ATX-400PNF

To see if a 6.3v good quality cap is sufficient where they are using a cheap 10v cap.

I see many mentions of where caps of higher voltage are used without an underlying requirement.

[willawake]

Re: Fortron FSP-ATX-400PNF

probably safer to do it on a molex. recommended to check on various levels of load and no load. it is probably ok though.

with higher voltage though, sometimes much better specs in same diameter just taller. even in the good caps.

[bgavin]

Re: Fortron FSP-ATX-400PNF

I was more concerned about cheap caps in 16v in 10mm diameter vs. premium cap in 10v and 10mm diameter. The oddball Teapo and Fuhkyyu 1650uF and 1800uF are in 10mm diameter. It is harder for me to find matching premium caps in the same diameter.

[Daijoubu]

Re: Fortron FSP-ATX-400PNF

Mine have OSTs for the big ones and the ball bearing version of the Yate Loon fan (D12BH-12)

[Daijoubu]

Re: Fortron FSP-ATX-400PNF



Has no PFC too (I'm in Canada)

[Big Pope]

Re: Fortron FSP-ATX-400PNF

willawake,

Would you tell me the value capacitance and diameter of large can input caps(Teapo)?

[willawake]

Re: Fortron FSP-ATX-400PNF

they are Teapo LXK 820uf 200v.
looking at the spec sheet they would be either 25x30 or 35x30. I will pull the psu to check, when i can.

[Big Pope]

Re: Fortron FSP-ATX-400PNF

they are Teapo LXK 820uf 200v.
looking at the spec sheet they would be either 25x30 or 35x30. I will pull the psu to check, when i can.

Thanks, because i want to replace it with Samxon EP series for testing, so i need to know the diameter first.

[nsx29]

Re: Fortron FSP-ATX-400PNF

I have seen testing by others that indicate high ripple with this psu. The primary cap of 820uf 200V is kinda small for a 400w.

I open this HEC 350 watt which have a pair of 1000uf 200V by capxon. This PSU is from 2001. THe secondary caps are domed (fujuyyu caps). I don't know why in this psu use 470uf 35V on and 400uf 25V on the secondary side. I don't think psu need 25 and 35V on the secondary. I will update with picture in the build thread.

[kc8adu]

Re: Fortron FSP-ATX-400PNF

watch for those 25v caps to be on the -5 and -12.
they are filters before the regulator ic for the 2 lines.
since supply has to be well above the target for the common 78xx and 79xx a 16v cap wont do and give any headroom.

[skafiskafnjak]

Re: Fortron FSP-ATX-400PNF

I am using these power supplies in all my custom built PC's for a long time and never had any problem with them.

[mzperx]

Re: Fortron FSP-ATX-400PNF

I have 2 of these PSU laying around with bad caps. One of the 2 CAPs in the middle (Teapo 1000uF 10V) are dead on both.

I wonder if it originates from the capacitor quality or maybe the motherboard what it worked with killed it.. (I found these)

I would change them, but I have only 1 such capacitor in my inventory but that has greated diameter, or I have some (a lot) nichicon 1000uF 6.3V caps.. oh and a Jee 1000uF 16V.
Jee is low quality as I read, but maybe it is oversized enough not to die?

Also would it be enough to change 1 cap on both, or both caps since they are identical, and I guess the other can fail as well?

[shovenose]

Re: Fortron FSP-ATX-400PNF

fsp is a decent psu oem, but the love crap caps!