Is an L&C power supply suitable for a Celeron 2.2GHz PC?

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Any oscilloscope results?

Sorry, if my Enermax 300W PSU hadn't failed then my L&C would of been hooked up to the oscilloscope. Since it's now being used in a computer, I can't guarantee for sure if it'll ever be hooked up to the oscilloscope.

But good thing it's working great.

[370forlife]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

the first still had 4 diodes and a lack of transformers. better but no good

btw, that card better be better than decent. that is the nicest one in the house (i thought my geforce 5200fx 128mb was nice...)

Its got a pretty big transformer right there in the middle.

call me a retard but which components are the switchers?

Usually all or most of the silicon bolted to the primary side heatsink.

[ratdude747]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

ok, ill check my allied sitting in my room for those.

thanks for the vid. link. i am trying to get my friend's computer business to stop using a-power. they say they are nice becase they last 4 years. i say 4 years is pitiful. gutless wonders suck.

[momaka]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

I have taken the +12V and +5V voltages that my L&C power supply is currently supplying to the computer it is in. The +12V rail is at 11.97V, and the +5V rail is at 5.05V. Both are rock solid (no fluctuations at all).

How is the temperature on the case and fan outlet? Also, are these voltage measures under full load as well?
The voltages above look great, though. Probably due to the fact that there's much better capacitors now. Of course acstech is right, o-scope shots would be nice to see if there's any ripple and noise still (it will complete this thread nicely).
----
Just one more suggestion and I hope you don't mind (I know I'm probably getting on your nerves now )... if there are any big power resistors touching the secondary caps (or very close to them), try and push the resistors away from the caps. If they can't be pushed away, try to solder them in a different place (but keep them on the same rail they were on) - there's usually space next to the output wires. This will keep the caps cool and can extend their life.
Also, you can use one of the FR302 3A diodes to replace the 5vsb diode output if you like.
----
As for the rest of the power supply: I must say, you did a great job yet again!
So what do you say, maybe we look into the Enermax next?

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

I thought this PSU was done! Well it is, now I'll have to see if it will last in its unexpected return to powering a computer.

When I get the time I'll take a look at that Enermax 300W, there must be a reason for it to not be working normally!

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Here's what happened with my Enermax 300W:

I had just recapped the VIA P4PA-UL motherboard I had. I hooked everything up including that Enermax 300W PSU. Yay, the motherboard works when I powered it on. I did a short run of Memtest86+ v2.11 to test the motherboard's stability. Memtest86+ for 2 hours found no errors, so I shut off the computer so I could plug in the rest of the front panel connectors (I only had the power button plugged in at the time).

I finish that, and power up the computer. It did not POST! No beeps at all, just fans spinning. I cleared the CMOS using the clear CMOS jumper, no POST. I take the motherboard out and touch up the solder joints of the ATX and P4 12V connectors on the motherboard. I put it back in the case and hook everything back up, still no POST. I reseat the video card and tried another known working video card without any improvement to the problem, still no POST. I reseated the RAM, still no POST. As a desperate last attempt to get the motherboard working I swap out the Enermax 300W with my modified L&C power supply. I pressed the power button, fans spin up, and POST!

I put back the Enermax and tried it again. No POST like before. I put the L&C back in, the motherboard works. I finally conclude that the Enermax PSU is at fault, and a fresh installation of XP Pro SP3 along with a two hour run of Prime95 went out without any problems with the L&C power supply.

I never expected the Enermax to somehow fail, it is built very well. Maybe the PCE-TUR caps in it are causing the problem.

[lucky13]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Talk about a labour of love.

Congrats on a well done mod job!

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

JNC is probably one of the worst L&Cs you'll ever see. Those PSUs were quite popular in Easter Europe. I actually had one, but it died (surprising, isn't it?).
Here's what it looked like more or less:
https://www.badcaps.net/forum/showth...ighlight=m-tec
Reading that thread, you seemed to have one as well.

HAHAHAHA I had that exact one that kc8adu was talking about actually!

I still have the remnants of it, I'll take a few pictures and post them here.

[linuxguru]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Newbie2: This could be an ATX 1.3 and 2.0 issue - ATX 2.0 PSU don't have -5V any more, and the Enermax 300W may be missing it, while the mobo may require it. The other possibility is insufficient current on +5Vsb, the ATX spec changed it from 1A to 2A somewhere along the line.

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Newbie2: This could be an ATX 1.3 and 2.0 issue - ATX 2.0 PSU don't have -5V any more, and the Enermax 300W may be missing it, while the mobo may require it. The other possibility is insufficient current on +5Vsb, the ATX spec changed it from 1A to 2A somewhere along the line.

The Enermax 300W power supply I have is not new at all, I pulled it out of a used PC with a Pentium III 450MHz processor back in 2005. It is newer than that ancient computer though, it has P4 support. Its model number is EG301P-VE.

It has the -5V rail, at 1A. It has the +5VSB rail at 2.2A. Here are the complete specifications of it:

+3.3V: 28A
+5V: 30A
+12V: 15A
-5V: 1A
-12V: 1A
+5VSB: 2.2A
+3.3V & 5V: 170W
TOTAL POWER: 300W

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Here are pictures of my Enermax 300W power supply:

[Per Hansson]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Good work Newbie2!
Would love to see some scope shots too

As for the Enermax, they are kinda famous for this problem; https://www.badcaps.net/forum/showthread.php?t=5466

[ratdude747]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

recap the enermax and it will be nice. good heatsinks. get rid of the glue though

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Luckily, I inspected the MOSFETS on the primary side and the power rectifiers on the secondary side and none of them had that glue.

And I fixed it! I replaced all of the "JPCE-TUR" capacitors on the secondary side with a mix of Panasonic and Rubycon capacitors.

1 JPCE-TUR 3300uf 16V 12.5mm capacitor -> 1 Panasonic FM series 2700uf 16V 12.5mm capacitor

2 JPCE-TUR 3300uf 10V 12.5mm capacitors -> 2 Panasonic FM series 2700uf 16V 12.5mm capacitors

2 JPCE-TUR 2200uf 10V 10mm capacitors -> 2 Rubycon MCZ series 1800uf 16V 10mm capacitors

2 JPCE-TUR 1000uf 10V 8mm capacitors -> 2 Rubycon MCZ series 1800uf 6.3V 8mm capacitors

2 JPCE-TUR 470uf 16V 8mm capacitors -> 2 Panasonic FC series 470uf 35V 10mm capacitors

1 JPCE-TUR 100uf 16V capacitor -> 1 Panasonic FC series 220uf 25V 8mm capacitor

Pictures:














Now the VIA P4PA-UL motherboard I have in my Celeron 2.2GHz computer will POST with my Enermax 300W power supply, after I recapped it.

[everell]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Before leaving the subject of questionable power supplies.....................

I was gutting an Athena 400 watt power supply - removed the 5vsb transformer and heat sinks with transistors and diodes. What is left tells an interesting story. For a power supply rated for 400 watts - no x and y filter components on the input side, just jumper wires. Input capacitors are 330 Mfd. And on the output side - look how small the capacitors are. Most interesting is the four separate diodes in the bridge circuit. Two of the diodes are LT5315 2A07 (could not find a datasheet for these) and the other two are LT5216 1N4007. The 1N4007 diode is rated for only one amp. So the most you are going to get thru the bridge is one amp. Multiply that by 110 volts and the max input power is 110 watts. If 80% efficient, that means this power supply is good only for 88 watts!

[370forlife]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

And the award for tiniest diodes goes too....



not a good thing at all.

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Before leaving the subject of questionable power supplies.....................

I was gutting an Athena 400 watt power supply - removed the 5vsb transformer and heat sinks with transistors and diodes. What is left tells an interesting story. For a power supply rated for 400 watts - no x and y filter components on the input side, just jumper wires. Input capacitors are 330 Mfd. And on the output side - look how small the capacitors are. Most interesting is the four separate diodes in the bridge circuit. Two of the diodes are LT5315 2A07 (could not find a datasheet for these) and the other two are LT5216 1N4007. The 1N4007 diode is rated for only one amp. So the most you are going to get thru the bridge is one amp. Multiply that by 110 volts and the max input power is 110 watts. If 80% efficient, that means this power supply is good only for 88 watts!

Assume 70% efficiency (most generic power supplies are probably around that efficiency) and that Athena power supply is only good for 77 watts!

It would probably provide just enough power for an old low-end Pentium MMX or Pentium II computer, but nothing else. I think that's why the only 400W Athena Power power supply I could find on Newegg.com was for old AT systems: http://www.newegg.com/Product/Produc...82E16817338025

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

HAHAHAHA I had that exact one that kc8adu was talking about actually!

I still have the remnants of it, I'll take a few pictures and post them here.

Well as said, here is a pictures of the remnants of my old "PRO POWER" 250W power supply:

[momaka]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Newbie2: did your Pro Power come with CapXon caps and 18 gauge wire?

Everell: Other than the undersized components, the PCB looks pretty clean actually. The design of that "400w" Athena doesn't look bad. Perhaps it has short circuit and maybe other protections as well.
Could make a nice basic power supply with better caps and diodes. Main transformer is size "28" though, so this power supply is limited to 200 watts.

[Newbie2]

Re: Is an L&C power supply suitable for a Celeron 2.2GHz PC?

Newbie2: did your Pro Power come with CapXon caps and 18 gauge wire?

It did come with CapXon capacitors, but the capacitors you see in the picture are not its original capacitors as I used it as something to practice with when I first learned how to solder.

I'm not sure on the wire gauge, but it is thin wire.