Announcement

**tiresias** · 03-12-2006, 10:59 AM

Re: Fotron Source FSP235-60GT 3.3v out of spec

A little simplistic, but have you verified whether the Vsense wire from the ATX connector is viable and properly attached at both ends?

I had a Fortron ATX300-GT (I have a few kicking around, they're cheap and can be quite useful) with an out-of-range 3.3vdc line (around 3.75 I believe), the PSU immediately shutting down if it was tipped or shaken. The problem in this case was the 3.3 Vsense wire, which had come loose from its solder point on the PCB and was now barely scraping its surface.

Apparently increasing resistance at this junction would cause the 3.3v to rise (ultimately going way out of spec), while disconnection would shut down the unit.

**Per Hansson** · 03-12-2006, 12:16 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Thank you so much tiresias, I would never have thought of that... In the second pic you can see the small PCB that controls 3.3v... Vsense goes into it, I saw that the soldering joint was not so good so I resoldered it and then tuned the potentiometer so I got 3.33v with my test mobo...

Voltages where stable...

So I fired it up on a very high end machine for that 235w PSU, a KT7A mobo with a 1.4ghz Athlon and a 9800Pro, started Rthdribl and the voltages are at 3.43v, just fluctuating +0.02v!

Again, thank you allot! (And FYI I replaced the Fuhjyyu 3300uF 10v cap with a TEAPO I took of an old Epox 8KHA+ mobo, rated for just 2200uF but that does not seem to be a problem... Of course I will buy good caps for this nice PSU in my next order with Elfa...)

**tiresias** · 03-12-2006, 01:23 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Originally posted by Per Hansson

Thank you so much tiresias, I would never have thought of that... In the second pic you can see the small PCB that controls 3.3v... Vsense goes into it, I saw that the soldering joint was not so good so I resoldered it and then tuned the potentiometer so I got 3.33v with my test mobo...

Voltages where stable...

Glad to be of aid

The PCB soldering joints for those Vsense wires can be a little weak at times - I guess it's a consequence of both of the tiny wire gauge Fortron uses and the, at times, relatively loose cable ties/grommeting - which increases the risk of the wire getting "pulled".

Now, following the "Vsense incident", I always make sure that I open up any newly-acquired PSU and give its output wires a full treatment with tightly-pulled, large, black, scary cable ties before and after the grommet.

Well, I first test the unit at least once to see if it's not DOA, and after that - Warranty-void-stickers-be-damned!

**willawake** · 03-12-2006, 01:29 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Well, I first test the unit at least once to see if it's not DOA, and after that - Warranty-void-stickers-be-damned!

hehehehe i do the same. i just cannot sleep good if i have not dissasembled new products to assess their quality and determine their mtbf.

congrats on the success guys, its nice to see the forum make people happy.

**PeteS in CA** · 03-12-2006, 03:38 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Good call tiresias! The +3.3V is usually post-regulated with a mag-amp. It's a little circuit that gives a special inductor a little reverse charge during the main switch off time. Then when the main switch turns on, in the +3.3V circuit, the first part of the on time is blocked from the O/P circuit as it overcomes the reverse charge of the inductor. The mag-amp circuit controls how much of the main switch on time is blocked so as to achieve regulation.

**tiresias** · 03-15-2006, 07:52 AM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Hi Pete,

Many thanks for the clarification - I was just reading through your PSU FAQ, and I must say it's most well-written and informative.

I'll certainly be posting a few extra questions for you on that FAQ at some point in the near future.

**Per Hansson** · 03-30-2006, 02:11 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

This must have been how the PSU was supposed to come first right? ;-)

Sanyo MV-WX for everything bar one Rubycon MBZ 10mm in a tight spot... (The Sanyos where all 12.5mm)

I also changed the two small TEAPO caps you can see in the third pic in my first post, 330uF 35v and 220uF 16v...

Attached Files

**yanz** · 03-31-2006, 02:25 AM

Re: Fotron Source FSP235-60GT 3.3v out of spec

@Per Hansson, you sure those are Sanyo caps? It's not that i doubt it, but i get my hand some sanyo WG caps with "X" vent (1500uF 16V 10mm), and the supplier swear to god(!) that they are original..

It's the same supplier i got my good Sanyo 3300uf WG caps.

**kc8adu** · 03-31-2006, 06:54 AM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Originally posted by yanz

@Per Hansson, you sure those are Sanyo caps? It's not that i doubt it, but i get my hand some sanyo WG caps with "X" vent (1500uF 16V 10mm), and the supplier swear to god(!) that they are original..

It's the same supplier i got my good Sanyo 3300uf WG caps.

we need pictures!
all sanyo caps i have seen have k vents.
pics of the vents,bungs,and print please.
edit!
i have seen those x vents on larger sanyo but not the 10mm.

**Chris1992** · 03-31-2006, 07:12 AM

Re: Fotron Source FSP235-60GT 3.3v out of spec

I have sanyo with that vent on a dell poweredge board from about 1997.

**Per Hansson** · 03-31-2006, 07:32 AM

Re: Fotron Source FSP235-60GT 3.3v out of spec

The caps below 12.5mm have K vents, those above (I did say they where 12.5mm) have X vents. The caps where bought from Elfa, so they are indeed original and not counterfeit

Attached Files

**yanz** · 03-31-2006, 01:07 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

well, yesterday i stole my sisters camera (j/k

).
she was visiting me in the town.

i couldn't took many pics as itsucks for reading the writing on the caps.
only got the pics of the vent. everything else of the caps is just the same with my wg caps on another thread in recaping forum.

it is even as shiny as the known 3300uf wg caps. beautiful case.

damn i so confused. already test it on my strider 360W and abit kt7, they do fine.

i'll need to buy a good digital camera eventually..

so here it is, what do you think about it..

instead of "+" vent it is more like "X".

flashlight just make the pic worse.. the macro function isn't good..

Attached Files

**willawake** · 03-31-2006, 01:20 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

per : show the bung please

yanz : the vents are different but you know we are talking about different markets so who knows. better to get an esr meter and check these caps and the FJ over time and see what happens. also you have WG and Per has WX. maybe they change vent in all series? it is a pity to change something so characteristic of sanyo caps.

why do you bend the leads like that? i dont recommend unless you are careful doing it

**Per Hansson** · 03-31-2006, 02:08 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Attached Files

**willawake** · 03-31-2006, 02:15 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

looks like a sanyo

**Per Hansson** · 03-31-2006, 02:40 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Originally posted by willawake

looks like a sanyo

I never had any doubts...

**willawake** · 03-31-2006, 02:58 PM

Re: Fotron Source FSP235-60GT 3.3v out of spec

yes i hope so lol. i mean the vents look more sanyo than yanz version.

i will make formal application for info to sanyo and panasonic so we dont get more confused.

**Per Hansson** · 04-01-2006, 05:36 AM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Wow, according to my very calibrated "put the hand behind the PSU and feel how warm it is" test the PSU is now running like 20°C lower temp!

Before it was really hot, so hot I got kinda afraid... But I wanted to kill the little fucker

Anyway, now the air from it feels much closer to room temp, and the fan is not spinning full rev anymore either... Guess those caps made quite the difference ;-)

**Per Hansson** · 04-01-2006, 06:07 AM

Re: Fotron Source FSP235-60GT 3.3v out of spec

Here is a new overview pic of the recapped PSU, you can see one large 12.5mm cap in the Secondary side with the X vent but also in the middle of the PSU two smaller caps, with "K" vents, 10 and 8mm in diameter. 330uF 35v and 220uF 16v respectivley...

Attached Files

Announcement

Fotron Source FSP235-60GT 3.3v out of spec

Fotron Source FSP235-60GT 3.3v out of spec

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