Bestec ATX-300-12Z REV.EHR

[POM_MJ]

I've a Bestec ATX-300-12Z REV.EHR.
It supply 4.98V(5V), 3.32V(3.3V), 11.80V(12V).
Is there possibly to make it supply 12.0V (or nearly) on 12V rails? How to do?
please advise.







3.3Vsense is brown wire, 5Vsence is pink wire, has no 12Vsense wire.

[Toasty]

Re: Bestec ATX-300-12Z REV.EHR

Usually putting a load on the power supply brings the voltage closer to spec. 11.80v is within the ATX specification of +/- 5% (11.4v-12.6v).

Toast

[POM_MJ]

Re: Bestec ATX-300-12Z REV.EHR

I've measure those voltages when the PSU is supply to M/B DFI NF4-D, Athlon64 3000+, DDR1 2x512MB, GeForce 7300GS, no HDD.
and put more 12V load by 6.6 ohm (serie of two 3.3 ohm resister).

I've used the above system to test many of PSUs, all of them are supply 12.xxV except this Bestec unit.

Could be possibly, It has some defected in 12V circuit?

[370forlife]

Re: Bestec ATX-300-12Z REV.EHR

11.8 is well in atx spec, so no it is not defective. This is a heavily 5v and 3.3v based unit, with little on the 12v, and with that processor is a 12v based cpu I would expect it to be about there.

Are you doing a burn in test while measuring these voltages? If not, it may just not be a big enough load for that bestec to ramp up the 12v.

[Toasty]

Re: Bestec ATX-300-12Z REV.EHR

I don't know the age or "hours-in-use" of this supply. You may want to investigate those output caps. OST's are known crap and could be weak allowing the 12v to sag.

Toast

[POM_MJ]

Re: Bestec ATX-300-12Z REV.EHR

Thankyou for every answers.

11.8 is well in atx spec, so no it is not defective. This is a heavily 5v and 3.3v based unit, with little on the 12v, and with that processor is a 12v based cpu I would expect it to be about there.

Yes, like Toasty said 11.4V-12.6V is stay in ATX spec.
I just worry with this unit because it doesn't supply 12.xxV like the others.

Are you doing a burn in test while measuring these voltages? If not, it may just not be a big enough load for that bestec to ramp up the 12v.

No, not yet.
Ok, I'll try to burn in test with a bigger load, then post the result later.

I don't know the age or "hours-in-use" of this supply. You may want to investigate those output caps. OST's are known crap and could be weak allowing the 12v to sag.
Toast

Output caps are look good, they're Ltec and Jamicon.
for 12V pi filter, 2,200/16V and 1,000/16V Jamicon.

more info about output diodes, used STPS3045CW for 3.3V, 2xSPTS3045CW for 5.0V and 2xSPTS20H100CT for 12V.

[370forlife]

Re: Bestec ATX-300-12Z REV.EHR

All the ones that I see in that picture with the X top are OST. I only see one jamicon, and one tk.

[Toasty]

Re: Bestec ATX-300-12Z REV.EHR

>>Output caps are look good, they're Ltec and Jamicon.<<

<shakes head>
More crap. Looks mean nothing.

Replace those output caps now and save yourself the headache(s) later on of:
1) chasing errors that will have you swearing it's a Windows problem
2) blown caps on the mobo from having to handle the ripple from that PSU

There are 7 I think. Looks like one under the wire bundle. 15 minutes now = saved hours later.

Toast

[c_hegge]

Re: Bestec ATX-300-12Z REV.EHR

The OST caps could already be failing. I've seen them fail without bulging or leaking. The others (Jamicon and Ltec) may be OK now but replace them anyway as they will more than likely fail in the future. Also, given the problems that other members have experienced with Bestec PSUs, I wouldn't even re-cap it. Just toss it out and replace it with thermaltake or coolermaster.

[370forlife]

Re: Bestec ATX-300-12Z REV.EHR

Bestecs are actually good power supplies after being recapped. Almost as good of quality as delta's, excluding the -12E series.

I would choose it over some thermaltakes. Lower end ones are overrated HEC's, and the higher end are CWT's that have mediocre ripple suppression (just under atx spec,) and ok voltage regulation.

Coolermaster, unless you buy the higher end AcBel's, the low end ones are overrated and mediocre.

Just buy delta or seasonic (or new antecs)

[PCBONEZ]

Re: Bestec ATX-300-12Z REV.EHR

Be wary of Antec.
A recent experience suggests they may be returning to old ways.

News at 11.

[Or rather after I have a chance for more than a quick look and can check some date codes.]

[370forlife]

Re: Bestec ATX-300-12Z REV.EHR

Be wary of Antec.
A recent experience suggests they may be returning to old ways.

News at 11.

[Or rather after I have a chance for more than a quick look and can check some date codes.]

Umm? What kind of antec are you looking at? Almost all their units are delta, except for the TPN series which are seasonic, and Quattro series that are Enhance.

[Toasty]

Re: Bestec ATX-300-12Z REV.EHR

Good. More business!

The Basiq series??

[POM_MJ]

Re: Bestec ATX-300-12Z REV.EHR

from your recommendations, firstly I need to replace all output caps, I think.
After that, more pictures will coming and burn in with big load test result also.

[370forlife]

Re: Bestec ATX-300-12Z REV.EHR

Good. More business!

The Basiq series??

Maybe the old FSP based ones that were terrible, but the newer ones are delta, too.

http://www.jonnyguru.com/forums/show...86&postcount=1

[Toasty]

Re: Bestec ATX-300-12Z REV.EHR

@POM_MJ -
Check for a cap around 2200uF near the 5vsb transformer. It will be on the other side of the 2nd heat sink in about the same position as the green output coil. That's a common failure also.

Toast

[PCBONEZ]

Re: Bestec ATX-300-12Z REV.EHR

Earthwatts EA-500D - The Delta version.

The first one I looked at only had one LTEC and the rest were UCC or CapXon.
The LTEC was a 1000uF in +5vsb but right in front of the fan so well cooled.

Another EA-500D came in last week. Just took it apart.
It's got 4 LTEC [8mm and up] and at least one TAICON 6.3mm in there right in a hot spot.
Dates on parts inside suggest Sept 2008 [or later] build.

I dunno the dates on the first one and it's in service so I can't check right away but I'm pretty certain [because of when I got it] that's it's an older revision than this one.
.

[Toasty]

Re: Bestec ATX-300-12Z REV.EHR

Oh JOY! Those are the models I received as replacements for the SP-450's.

I only took a few cursory shots of the internals and the bottom of the main board. I did not disassemble the units for a clear look. One shot does show 3 Taicon's. Two are near the smaller output coil just under the mains plug. Another sits flat against a small board with a trim pot that's mounted perpendicular to the main board against the side wall at the outputs.

Mains filter are 2 SamXon CH's. That's all the clear identification I can see. I can see a couple smaller ones in a dark blue with white lettering wrapper, and a chocolate brown one that's likely a UCC.

I guess even Delta can be coerced into putting junk in their units. Sad day.

Toast

[PCBONEZ]

Re: Bestec ATX-300-12Z REV.EHR

The 8mm and LTEC I see are either the same chocolate brown as UCC or dark blue.
The 10mm LTEC I see are the same chocolate brown as UCC.
The 8mm/10mm CapXons are also that same chocolate brown.
All 3 brands are using the same color brown.
-
Isn't that SPECIAL!
.

[weirdlookinguy]

Re: Bestec ATX-300-12Z REV.EHR

Antec just discontinued the black Solo case, as well as the white version that came with a PSU included. These were really nice, sturdy cases with 0.8 steel, a killer glossy finish, sound-dampening sheets on the side panels, and really thick and sturdy caddies for HDDs. I have one myself, and I believe Topcat has four of them.

Not-so-coincidentially, IMO, they just put out this cheapass $50 black case that feels really flimsy. I don't know (or care) what the model name/# is, but it seems like it's the Solo's replacement.

I don't know if this coincides with Delta, but it's really sad to see a company that used to be known for quality (Antec) bust a China on us and go cheap like that.

UPDATE: This is the case:
http://www.newegg.com/Product/Produc...82E16811129042

It's not TOO bad, but it feels like a toy compared to the Solo.