Annoying heavy load-failure in Tecnoware Free Silent 500W

[goodpsusearch]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

I am re-reading the thread...

OK, done.

2 caps in parallel without a coil in series among them is definitely better than just 1 cap per voltage output.

The last psu is not worth recapping/repairing.

About the other psus, you could use them with caution.

Pay attention to this:

Yes.

Your FAL501FS12 had those 1500 uF caps everywhere simply because the manufacturer probably saved a few coins by not buying bigger 2200 uF caps. Same reason why there are no inductor coils between the caps - less parts to put in, less cost for the manufacturer.

Pinch a coin here and there and you can save a decent amount at the end of the day.

You can try improving these power supplies but no one here can guarantee to you that they are going to be safe to use on a power hungry and expensive system, such as an Intel quad core computer. I wouldn't.

[omega]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

The psu I saw some posts ago definitely belongs to the "For parts only" pile.

It's exactly what I show you in middle December in this thread. What I can say is that I recapped the first ones with Japan quality ones according to the momaka directions and now one of them is about to pass my 10-day-stress test.
As posted, would I put them away, would also put myself and my research away, now I am obliged to repair them. :-(

[goodpsusearch]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Before doing anything please first post pics of the psu in question. There are some known issues with certain models and we could advise you what to do with them.

The psu I saw some posts ago definitely belongs to the "For parts only" pile.

[omega]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

2 caps in parallel

ops sorry for the lapsus digiti :-)

Then I won't recap this last one, but I will replaced it by a spared "two caps" PSU, which I will Panasonic recap in the meantime

[goodpsusearch]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

No coil but 2 caps in parallel per rail is OK if you make sure that the caps are not bad and choose their capacity and esr wisely

[omega]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Sorry, I didn't read the whole thread.
This thing has no output coils and only 1 cap per rail. Ripple is gonna be terrible. There is really no point trying to repair/recap a psu like that.
It should never be powering a computer again.

Thank you for your post! Unfortunately, as I explained above, it was a crazy choice of 2011 which I can't modify now. Anyway, I think you believe it even worse than the 3rd series Tecnoware PSU (posted at the beginning of the thread) which has no coil but TWO identical serial caps per rail. Right?

[goodpsusearch]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Sorry, I didn't read the whole thread.

https://www.badcaps.net/forum/attach...4&d=1454168083

This is terrible. The 3 main output voltages (3.3V, 5V and 12V) need to have a CLC output filter.

Capacitor , coil in series and capacitor.

This thing has no output coils and only 1 cap per rail. Ripple is gonna be terrible. There is really no point trying to repair/recap a psu like that.

It should never be powering a computer again.

[omega]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Sorry for my delay in replying but I have been concerned in a slow recapping of ATX in my free time!
So far I recapped four Power Supplies (and replaced their 12 V rail diodes) but I had the opportunity to test two only and the result is of course Solomonic. One had shortly failed (ATAPI error of the HDD) and the other has been stressed for 10 days of intensive computation and holds super. However, I believe that the statistics has to be extended to the other recapped PSU, maybe the failure of the former machine has been due to the Mobo or elsewhere.
Momaka, as you suggested me, I also have been desoldering the resistors (see the picture), actually 470 ohm, since most of them have been baked enough for the colour bands to appear all as dark-brown ones :-) Anyway, the dissipating heat is 17x17/470 = 0.61 W which is 20% too much for a halfwatt resistor. Therefore I removed thm all (V = -11.5 to -12 V). I measured every voltage under a 21 W car stop bulb (see picture) connected to the 12 V rail only. Not so much indeed, but better than nothing.
The other pictures are concerning the previous release of the ATX posted in this thread to recap. Here, there is the usual failure under intense load (ATAPI error #11 and #9). Based to the hints of my "teacher" Momaka, I now have some clue of my own about recapping and replacing the diode. Just let me post some questions:
1. why did they put a 2200 uF 6.3 V cap in the 5VSB rail after the wattage in the specification is even lower with respect to the newer release (10 W vs. 12.5 W)?
2. is there any concern about the presence of a central, small electrolytic cap between the fast diode and the two small transistors (I had to also replace a 0.25 W 10 ohm resistor - red ellipse - which was rather baked together the PCB)?
3. what may the green spots on the ChengX cap black envelopes near the diode heatsink mean? I can see no exploded component, however.
4. last but not least: how can one MEASURE the actual (instant) load of a PC to an ATX? I mean experimental readings, not average computing in some web sites. I begin to suspect that the PSUs simply can't afford the intense load of my computations!

P.S. I am inspecting the Corsair VS450, which we had speaking about in a previous post. It's indeed full of CapXon and JunFu caps! I will be posting some pics since it's not yet clear to me which cap belongs to which rail.

[Bungz]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

I have skim read the thread but I will say this.

It will be allot easier to replace the PSU's rather than find new P5B's, those are nice boards and not particularly cheap 2nd hand.

[momaka]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

I argue that if there is NO Capxon, PSU is fine and I will let it get old untouched in my machine
Otherwise have I to replace with SAME capacity, low ESR, high quality caps?

Yes.

(I ask you because you have suggested me to increase the capacities of recapping spares, I did not ask you the reason why).

The reason why is because those capacitances I suggested in post #16 are usually what a good quality power supply would use. Your FAL501FS12 had those 1500 uF caps everywhere simply because the manufacturer probably saved a few coins by not buying bigger 2200 uF caps. Same reason why there are no inductor coils between the caps - less parts to put in, less cost for the manufacturer.

Pinch a coin here and there and you can save a decent amount at the end of the day.

What about the rectifier in the 12V rail of that Corsair? Is it fine?

According to this review:
http://www.hardwareinsights.com/wp/c...s450-review/3/
... yes. You get two PFR30L60CT rectifiers in parallel on the 12V rail, which is more than enough. Of course, that is if this is what your PSU has too. If you open it, check and see for yourself.

Hi, which kind of load would you suggest me to use in order to test the PSUs with a DSO before and after redioding/recapping? I would have thought to low voltage lamps, such as car lamps.

Yes, 12 V halogen or incandescent lamps will do. I think even some Christmas incandescent light bulbs will work: either bulbs directly attached to the 5V rail or two bulbs in series connected to the 12V rail.

[Behemot]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Yeah car halogens are good, I myself use GY6.35 halogens. But you always have to use some kind of soft starting, I use 5A, aprox. 10R thermistors in series with each bulb. Bulbs have very high initial current.

[omega]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Hi, which kind of load would you suggest me to use in order to test the PSUs with a DSO before and after redioding/recapping? I would have thought to low voltage lamps, such as car lamps. But to build a standardized schematics (if any) developed by the forum for this purpose would be nice.

[Behemot]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Big caps for filtering purposes replace with same or higher capacity, if possible. There are rare occasions when replacement is simply not available so than you have to do with what you got This has been e. g. FSP GLN series with custom crapxon 2200/6.3 D8 caps. No longer valid though…

[omega]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

If your units have CapXon indeed, they will need a recap sooner rather than later.

Ok I am curious, I will open and inspect the PSU soon.
I argue that if there is NO Capxon, PSU is fine and I will let it get old untouched in my machine
Otherwise have I to replace with SAME capacity, low ESR, high quality caps? (I ask you because you have suggested me to increase the capacities of recapping spares, I did not ask you the reason why). What about the rectifier in the 12V rail of that Corsair? Is it fine?

VS is nothing extra but still much better than these two wonders I'd guess…

I believe next time I will buy the replacing caps from you, Behemot!

Other than that, as Behemot said, the VS series are decent PSUs. Should last a long time with a proper recap.

Happy to read that!
Thanks again

[momaka]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Momaka, You are right, they are indeed silicone pads on FAL501FS12 (can one buy them as spares?).

Yes, I think most big online electronics stores do have them. But I don't know if they will come pre-cut or send you a big sheet to cut yourself.

That said, I never bought any myself. I usually re-use them from junk PSUs and TV boards.

As a chemist and NOT electronics expert, I still have troubles with the specific terms, forgive me please.

We understood each other, so no problems.

After all, science, technology, and math are all closely related. Of course, the pictures in this thread did help quite a bit too.

However, I can sketch you silicone chemical formulas

Haha . Nice!
I have a cousin who has a degree in chemistry (fuels and petrol, specifically). Hard stuff!

By the way, in Oct. 2013 I also ordered few Corsair VS450 spare PSUs, one of them I have been using instead of the Tecnoware one. So far (about 1 year use) I got no trouble with the respective PC, but I also read here a thread where there were problems with defective C(r)apXon on them. Programmed obsolescence? Actually I did not understand whether the deprecated fact had been fixed in newer PSUs. Anyway, any suggestions?

Probably best to order some spare caps. If your units have CapXon indeed, they will need a recap sooner rather than later. Yes, "programmed obsolescence" is a fine way to put it.

Other than that, as Behemot said, the VS series are decent PSUs. Should last a long time with a proper recap.

[Behemot]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

VS is nothing extra but still much better than these two wonders I'd guess…

[omega]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Behemot and Momaka, Thanks so much for your answers!

Is that for the Tecnoware FAL500DF2 or the FAL501FS12?
Because the FAL501FS12 (the one you first posted about in this thread) appears to be using the gray silicone pads. I don't see pink gummy stuff anywhere. See above.

Momaka, You are right, they are indeed silicone pads on FAL501FS12 (can one buy them as spares?). As a chemist and NOT electronics expert, I still have troubles with the specific terms, forgive me please. However, I can sketch you silicone chemical formulas

By the way, in Oct. 2013 I also ordered few Corsair VS450 spare PSUs, one of them I have been using instead of the Tecnoware one. So far (about 1 year use) I got no trouble with the respective PC, but I also read here a thread where there were problems with defective C(r)apXon on them. Programmed obsolescence? Actually I did not understand whether the deprecated fact had been fixed in newer PSUs. Anyway, any suggestions?

[momaka]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

I have noticed that in that PSU the diodes (as well as the choppers) have been in contact to the heatsink through sort of pink gummy layer, without using any thermal paste.

Is that for the Tecnoware FAL500DF2 or the FAL501FS12?
Because the FAL501FS12 (the one you first posted about in this thread) appears to be using the gray silicone pads. I don't see pink gummy stuff anywhere. At least not in this picture you posted:
https://www.badcaps.net/forum/attach...1&d=1451235758

As long as those silicone pads are intact (i.e. no rips or holes in them, other than the one to mount the diodes and transistors), then you can re-use them. No need to apply thermal compound.

In the replacement of the diode, should I put some white paste between the back side of the diode and the gummy film?

See above.

[Behemot]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Yep - if they are TO-220 (with plain metal tab). TO-220FP is to be attached directly, as it is fully insulated, with some thermal compound applied.

[omega]

Re: Annoying heavy load-failure in Tecnoware Free Silent 500W

Won't hurt. The pads should be firm though, not any pasty stuff, in such case they are bad as they won't properly insulate.

Thanks Behemont, if I am not wrong there has to be a thermal but NOT an electric contact between the semiconductors and the heat sink, right?