Fortron FSP-ATX-400PNF

[Darko442]

Re: Fortron FSP-ATX-400PNF

Yes you are right,and R9,R12 is open,and now is time to reconsidering cost of repair or just to throw in junkbox.
Thank to all people for help
Darko442

[momaka]

Re: Fortron FSP-ATX-400PNF

If I'm not mistaken, it looks like the burned resistor is connected to the Base of Q1. This PSU uses half-bridge design, so the circuits that drive the Bases of the two D209L transistors should be exactly the same. Start at the Base of Q2 and follow the circuit, noting the components connected to it. There should be a resistor connected in the same way as the burned resistor.
From what I was able to trace, I think the Base-drive resistor for Q2 is on the other side of the heat sink, circled in yellow in the attached picture. The Base-drive resistor for Q1 should have the same value.
Even if the resistor for the Base-drive of Q2 looks okay, check it with a multimeter to make sure it hasn't gone open-circuit or out of spec.

** EDIT **
I looked up some pictures on Google and from what I was able to gather, the Base-drive resistor of Q2 might be R12. Check to see if the resistor I circled matches the location of R12 - if yes, then that's resistor value you should use for the burned resistor.

[Darko442]

Re: Fortron FSP-ATX-400PNF

Capacitor is solved,found rest of dead elco, 2.2uF 50 V(TEAPO),found it in PC case,what a explosion!!good idea for new year crackers...
Resistor is for now mysteries.

[Darko442]

Re: Fortron FSP-ATX-400PNF

thanks for speed help.Switching transistor is NPN "3DD209L" from China on this link is datasheet"http://www.alldatasheet.com/view.jsp?Searchword=D209L".
Resistor and electrolitic capacitor is in base circuit,fuse is blow,main switch transistors is blow,rectifier is ok,main electrolitic cap(1 and 2) is ok.and this is all for now...
pictures is attached
Darko442

[momaka]

Re: Fortron FSP-ATX-400PNF

If no one gets to your question in a day or two, post a picture of the underside of the PSU so that we can figure out what circuit that cap and resistor are part of.

[c_hegge]

Re: Fortron FSP-ATX-400PNF

I don't know what value the resistor is, but the exploded capacitor is probably the same as the other small one just behind it.

[Darko442]

Re: Fortron FSP-ATX-400PNF

hello
I have problem with Fortron FSP-ATX-400PNF, blow out electrolitic capacitor and burnout resistor in HV part of PSU,and please help,I need info for this capacitor, how is rated Capacity/Voltage.

[mzperx]

Re: Fortron FSP-ATX-400PNF

It seems that the solution will be really to try with whatever I got, and thenif it works change the whole set. It should still be cheaper than buying a brand new PSU, and if I but in brand caps it should stay function for years.

[370forlife]

Re: Fortron FSP-ATX-400PNF

If they are these type of united, then no they are not good

http://capacitor.web.fc2.com/u.html#united

These ones are:

http://capacitor.web.fc2.com/u.html#unitedchemicon

[mzperx]

Re: Fortron FSP-ATX-400PNF

I'm thinking if I can fix the problem, I might buy some caps, and redo the whole power supply, but first I want to fix the visible problem to see if it works at all or some other parts got blown too as a consequence.

[Th3_uN1Qu3]

Re: Fortron FSP-ATX-400PNF

If you're talking about United Chemi-Con, then yes they're good. Also i can confirm what PCBONEZ said about Teapo. I've also had good luck with Jamicon coz that's pretty much all they sell here, but only with general purpose ones in general purpose applications, never used (or seen for that matter) them in a SMPS yet.

Never seen bad primary caps? I did, in a blown Antec Smartpower. Not bloated but one has about 1.5 ohm ESR, the other 0.5. That is while ALL other primaries i have measure below 0.15. They were, guess what... Fuhjyyu of course! Funny thing is that all the Fuhjyyu and Jun Fu caps in the secondary of that PSU tested perfect.

[mzperx]

Re: Fortron FSP-ATX-400PNF

Returning to the repair part: found 2 United branded 1000uF 10V capacitors which should be the exact same size I need. Are they considered good?

[PCBONEZ]

Re: Fortron FSP-ATX-400PNF

Considering the mixed experiences here, we should maybe just settle on them all being rubbish and move on!

OST's get yanked regardless of condition.
It might say OST on it but my eyes see Fuhjyyu anyway.
I'll leave Teapo alone if I haven't seen a bad one in whatever model PSU yet and there is no other reason to pull it apart.

Maybe they're not so bad if the heat is kept down?

Yup, good cooling helps.

[PCBONEZ]

Re: Fortron FSP-ATX-400PNF

My experience is more in-line with what 370forlife said on mobos.
I would adjust it to:
Usually teapo will show it when they fail, OST often don't. [On mobos.]
-
For me, in PSU's they both usually show it and they both sometimes don't.

Thing is, with PSUs I tend to see the same model[s] over and over.
I usually get 5 to 10 at a time and stick to models I know.
When I see the same PSU over and over the odds are I'm going to see the same cap problems over and over.
So: many of you see a wider -variety- of PSU cap issues than I do.
.

[c_hegge]

Re: Fortron FSP-ATX-400PNF

Usually teapo will show it when they fail, OST hardly ever does.

I find that both brands often fail without showing it.

[Rulycat]

Re: Fortron FSP-ATX-400PNF

Considering the mixed experiences here, we should maybe just settle on them all being rubbish and move on!

Maybe they're not so bad if the heat is kept down?

[dood]

Re: Fortron FSP-ATX-400PNF

Usually teapo will show it when they fail, OST hardly ever does.

I've found the exact opposite to be true.

[370forlife]

Re: Fortron FSP-ATX-400PNF

Usually teapo will show it when they fail, OST hardly ever does.

[PCBONEZ]

Re: Fortron FSP-ATX-400PNF

Exact opposite experience with a batch of six FSP460-60PFN I did a while ago.
These had 3 cap PI filters on all three rails.
For the lot: 18 of 18 OST blown and only 4 of 26 Teapo blown. All the OST were on +12v. All the bad Teapo were in the same PSU. All the caps were 12.5mm.
... Also had 5 of 5 Fuhjyyu blown. - Imagine that!!
One had a light blue Teapo instead of a Fuhjyyu in that spot. That was one of the ones without blown Teapos.
.

[mockingbird]

Re: Fortron FSP-ATX-400PNF

The FSP units with Teapo caps fail often. I've got several 300W model "PN" or "PN/B" here. The "THN" models with the OST caps last longer.