Think this thing is worth recapping?

[Pentium4]

The fan died in it but the PSU still runs. Was planning on replacing the HEC primaries (one with the sticker is dead) and the all the JPCON caps. The heatsinks are pathetic but I was gonna put in an NMB fan straight to the 12V to keep it cool. The transformer is an ERL-33. For the switchers it has TWO 2SC2625 parts (400V, 10A)

Actual output rectifier ratings:
5V = 40A
3.3V = 20A
12V = 20A

I for sure thought there was gonna be a 10A part for the 12V, glad it's 20A instead decent coils on it as well

Secondary filtering for the main rails:
2200uF 10V x2
1000uF 16V x2
2200uF 16V

Think it's worth the recap? I'd have to remove the switchers to get to 2 small caps but might consider upgrading the switchers anyways

[goodpsusearch]

Re: Think this thing is worth recapping?

The transistors are not bad for 300W.

[Pentium4]

Re: Think this thing is worth recapping?

The transistors are not bad for 300W.

Nice, I'll leave them. I bent the primary heatsink and one of the heatsink leads popped off the PCB from the bottom, do I need to fix it or is it alright? I can post a picture if I need to

[lti]

Re: Think this thing is worth recapping?

That doesn't look like a bad power supply. The ratings are bullshit, but it would be fine for an old computer that doesn't use a lot of power.

It will probably still work with the loose heatsink, but I would still solder it back down.

[mariushm]

Re: Think this thing is worth recapping?

The UL number is Sirtec (High Power)... the product code also sounds like something high power would use.

Here you go http://www.highpowersupply.com/produ...c340101.htm#sp

If they made the power supplies back then as they make them now, the power supply may actually do the 340 watts.

So yeah, I'd recap it.

I'd also replace that red cable that's so stretched, so that it won't melt from the heatsink heat and possibly send mains voltage through the primary silicon (if they're not insulated from the heatsink).

[redwire]

Re: Think this thing is worth recapping?

I partially decide based on the +5VSB circuit. If it's the el-cheapo one-transistor oscillator (underneath the heatsink) I don't bother, because they overheat (standby; fan is off) and die. Usually you can see pcb hot spots there too.

[lti]

Re: Think this thing is worth recapping?

If they made the power supplies back then as they make them now, the power supply may actually do the 340 watts.

He said the 3.3V rectifier is only rated for 20A, and I wouldn't expect the other rectifiers to handle the full labeled ratings.

I partially decide based on the +5VSB circuit. If it's the el-cheapo one-transistor oscillator (underneath the heatsink) I don't bother, because they overheat (standby; fan is off) and die. Usually you can see pcb hot spots there too.

There is an IC near the primary heatsink that appears to be a TNY264P.

[Behemot]

Re: Think this thing is worth recapping?

You can replace secondary rectifiers without that much troubles, already loose heatsink even helps that.

I would also add components in the missing spots on input and than it may be fine.

[Pentium4]

Re: Think this thing is worth recapping?

You can replace secondary rectifiers without that much troubles, already loose heatsink even helps that.

I would also add components in the missing spots on input and than it may be fine.

Looks like there is just room for an X cap? I don't see a spot for an MOV. There's one cap I don't have an exact value to which is a 100uF 50V cap on the secondary, it's right in between the secondary rectifiers and coils. It's a JPCON. I've never seen a cap with that value on the secondary before, can someone enlighten me on what it's for? and the closest values I have for it are 100uF 25V or 470uF 35V

And believe it or not this thing actually has OTP

[Pentium4]

Re: Think this thing is worth recapping?

Also, I was going to put this X cap on the input but wasn't sure if I should remove this jumper wire, the lead to the left connects to the same joint as the Y cap it goes under

[Behemot]

Re: Think this thing is worth recapping?

Seems like it is connecting the Y cap to either neutral or phase?

As for the eletrolytic cap, if it's for 50 V, I usually replace it with 16+ V with no problems, there is (usually) no more than 12 V in ATX PSU. (exception may be +5 V SB driven by some kind of DC refference with higher-voltage input) Just be aware of ESR, if it is too much lower, it may cause troubles.

[Pentium4]

Re: Think this thing is worth recapping?

Seems like it is connecting the Y cap to either neutral or phase?

As for the eletrolytic cap, if it's for 50 V, I usually replace it with 16+ V with no problems, there is (usually) no more than 12 V in ATX PSU. (exception may be +5 V SB driven by some kind of DC refference with higher-voltage input) Just be aware of ESR, if it is too much lower, it may cause troubles.

So the jumper should stay? And alright sounds good I'll probably put a 100uF 25V Chemicon KY cap there

[mariushm]

Re: Think this thing is worth recapping?

Seems like it is connecting the Y cap to either neutral or phase?

As for the eletrolytic cap, if it's for 50 V, I usually replace it with 16+ V with no problems, there is (usually) no more than 12 V in ATX PSU. (exception may be +5 V SB driven by some kind of DC refference with higher-voltage input) Just be aware of ESR, if it is too much lower, it may cause troubles.

Be careful.

It's not always voltage related, especially with low value capacitors it's often bigger voltage => bigger can size => higher ripple handling capability / lower esr / more hours to live

The Y caps should be phase to ground and neutral to ground. the X caps are between phase and neutral. See

Not sure why they linked it with that black wire maybe the psu was also designed for when it's sold in 230v only countries or something like that?

[Behemot]

Re: Think this thing is worth recapping?

Can't tell, have a look to the other side what it interconnects.

Can't tell either, don't know what JPCON is that.

mariushm: but they usually use general purpose, so using low-ESR, you got much lower ESR than it was there before, which may actually harm in the other way. As for using crap caps, who understands their ideas. If they used good ones, they could go with 6,3V caps for +5 V, now they are using 10+ V with whatever reason I don't understand.

[mariushm]

Re: Think this thing is worth recapping?

If it's around that controller doing protections and whatnot, the capacitor can be part of a RC filter or used in related to an internal opamp of that chip.

If you see the 4th picture at the top, there's a 1uF 50v there... I'm sure it's not because ceramic or tantalum 1uF were more expensive, it's quite possible 1uF 50v electrolytic has low enough impedance/inductance/esr to work fine in that circuit, while tantalum/ceramics were too low to be suitable.

I've had my own issues with a simple linear regulator... with loads under 1-200mA, it was unstable if the esr of the output capacitor was below 0.2 ohm or above 1 ohm... above 200mA it had to be above 0.1 ohm.

So I had to cherry pick a 47-68uF 16v to have an ESR of about 0.35 ohm, even though the regulator was perfectly fine with as low as 10uF (which can be found in ceramic/tantalum form)

.

[Behemot]

Re: Think this thing is worth recapping?

That's why I bought hundreds of these Nichicon VZ caps. Similar specs like crap general purpose shits, but specs I believe, especially about high-temperatures and life.

[Pentium4]

Re: Think this thing is worth recapping?

Here's a picture of the other side of the board. I'm not sure what to do with that JPCON cap, I might just leave it. I just wanted to replace it because that thing is going to get cooked in between the rectifiers and coils.

[Behemot]

Re: Think this thing is worth recapping?

If I am looking there right, than those two paths end as input of the bridge rectifier in there. So yes, it seems to be connecting the Y cap to one of those, either neutral or phase, cant determine it right now

EDIT: considering the red wire is going from PFC coil probably, than its phase most likely, than…this connects the Y with neutral I think

[mcdaydavies]

Re: Think this thing is worth recapping?

It has them dreaded thin T shaped heatsinks, lol. Looks like it might have potential in an old computer though with a few mods.