Bestec ATX-1523F

[PC@live]

Hi to all.
For ATX power supplies, Hobby shelter I have a dozen currently being repaired.
Among those in repair I have a Mini-ATX Bestec Model ATX-1523F 150W Max, I'd like to fix.
The power supply does not start, I note that tensions are low + 5VSB (Purple), 28V, +1 and PS-ON (Green) +1, 12V.
Within any swollen capacitor.
To create space I disassembled the double fin secondary diodes, which I checked to be good.
List them: CTX12S D13, D14, D12 F10P10Q CTB34.
Primary capacitors are n° 2 330μF 250V CapXon. In the secondary have no. 3 VENT 680μF 16V, Jamicon 2200μF 6 n° 4 and n° 2 10V-16V.
The other two are small hidden next to primary, one is a 220μF Jamicon 25V, but I can't read what it is the other smaller.
On a welded on the main card, there are other small capacitors, Jamicon, about 8, those are readable from 0.1-0.22-2.2 μF 50V.
In the back of the main Board (circuit side) there's some SMD, while the back of the secondary card is full of SMD.
It is evident that the auxiliary power supply voltages are too low.
According to you, the only replacement of auxiliary power supply capacitors, could solve the problem?
If someone would kindly advise me what or where to look.
Thanks A Lot

[momaka]

Re: Bestec ATX-1523F

Post some pictures so we can see what you're seeing. Some Bestec power supplies - particularly the ATX-250 12E had major problems with the 5VSB/auxiliary circuit going over-voltage and killing motherboards, so pictures would help us see what the 5VSB circuit looks like in this power supply.

Please attach your pictures to the forums by using the "Manage Attachments" button (click "POST REPLY" button to get in the advanced post editor to get to that). Picture size limit is 2000x2000 pixels, so keep that in mind when uploading.

[PC@live]

Re: Bestec ATX-1523F

Post some pictures so we can see what you're seeing. Some Bestec power supplies - particularly the ATX-250 12E had major problems with the 5VSB/auxiliary circuit going over-voltage and killing motherboards, so pictures would help us see what the 5VSB circuit looks like in this power supply.

Please attach your pictures to the forums by using the "Manage Attachments" button (click "POST REPLY" button to get in the advanced post editor to get to that). Picture size limit is 2000x2000 pixels, so keep that in mind when uploading.

Thanks for letting me respond.
Here are pictures of the PSU open:
http://img855.*************/img855/8933/img0207xj.jpg
http://img843.*************/img843/1432/img0213kg.jpg
http://img545.*************/img545/6503/img0217rt.jpg
http://img89.*************/img89/2020/img0218og.jpg
http://img198.*************/img198/8894/img0221.JPG
http://img268.*************/img268/4535/img0226h.JPG
http://img27.*************/img27/6797/img0227wd.jpg
http://img201.*************/img201/9299/img0253ok.jpg
http://img96.*************/img96/5983/img0262tg.jpg
http://img838.*************/img838/222/img0268ey.jpg

I hope this ATX-1523F the 5VSB circuit is not equal to that of ATX-250 12E.
Maybe, you can kindly give me an opinion after seeing the pictures.
If you need more photos, specify what you want.
Greetings

[ben7]

Re: Bestec ATX-1523F

Jamicon capacitors are notorious for causing havoc in bestec psus!

[PC@live]

Re: Bestec ATX-1523F

Jamicon capacitors are notorious for causing havoc in bestec psus!

Thanks for the advice.
Unfortunately, this PSU is full of Jamicon, some are tiny (like 0.1 or 0.47 uF).
Also, I miss an ESR meter, but if I'm not mistaken, even having one, with so low, it is difficult to understand whether they are good or bad. Except the ESR has increased significantly.
To replace them, I could use some recovery, but those from 0.1 uF there are, alternatively I those from 0.47-1 uF, second or you can fit?
Kind regards

[ben7]

Re: Bestec ATX-1523F

To replace them, I could use some recovery, but those from 0.1 uF there are, alternatively I those from 0.47-1 uF, second or you can fit?

I'm sorry, but what do you mean?

[PC@live]

Re: Bestec ATX-1523F

I'm sorry, but what do you mean?

Hello and sorry for the errors due to the translator.
I hope that this time will be able to make myself understood.

I wanted to say this:
I do not have replacement capacitors from 0.1 and 0.47 uF.
Can I retrieve other from 0.47 and 1 uF.
Can I replace those from 0.1 uF with those from 0.47 uF?
Can I replace those from 0.47 uF with those from 1 uF?

Greetings

[ben7]

Re: Bestec ATX-1523F

Hello and sorry for the errors due to the translator.
I hope that this time will be able to make myself understood.

I wanted to say this:
I do not have replacement capacitors from 0.1 and 0.47 uF.
Can I retrieve other from 0.47 and 1 uF.
Can I replace those from 0.1 uF with those from 0.47 uF?
Can I replace those from 0.47 uF with those from 1 uF?

Greetings

You can replace them with film capacitors instead.

100nF = 0.1uF (film capacitor code is 104)
470nF = 0.47uF (film capacitor code is 474)

On film capacitors, the codes come before a letter, which means how much tolerance the ratings are guaranteed to be within.

[PC@live]

Re: Bestec ATX-1523F

You can replace them with film capacitors instead.

100nF = 0.1uF (film capacitor code is 104)
470nF = 0.47uF (film capacitor code is 474)

On film capacitors, the codes come before a letter, which means how much tolerance the ratings are guaranteed to be within.

Thanks for letting me respond to your advice.
I wanted to clarify that are electrolytic capacitors.
Then you can replace them with those film?

Greetings

[ben7]

Re: Bestec ATX-1523F

Thanks for letting me respond to your advice.
I wanted to clarify that are electrolytic capacitors.
Then you can replace them with those film?

Greetings

Yes, I think it will be ok to use the film capacitors. Besides, the film capacitors don't dry out like electrolytics.

[PC@live]

Re: Bestec ATX-1523F

Yes, I think it will be ok to use the film capacitors. Besides, the film capacitors don't dry out like electrolytics.

Thanks for the tip.
The only question that remains is the lack of polarity (+ and-) of film capacitors.

Greetings

[cheapie]

Re: Bestec ATX-1523F

Thanks for the tip.
The only question that remains is the lack of polarity (+ and-) of film capacitors.

Greetings

You can put non-polarized parts in either way.

[PC@live]

Re: Bestec ATX-1523F

You can put non-polarized parts in either way.

Ok is a remedy that I'll keep in mind, when I won't have replacement capacitors.
For the time being I focus on secondary adapter.
There is a large part of the circuit and PS-ON 5VSB.
I don't know, maybe the capacitors are good, and the failure is due to something else (eg. IC3, SCR1, IC5, Q2).

Greetings

[Heihachi_73]

Re: Bestec ATX-1523F

Your power supply board is dated 0132 (week 32 2001) - I would replace the caps anyway since they are during the well-known capacitor plague era.

Today, I just pulled this exact same PSU from an ancient HP Pavilion 8800 (AMD Duron 850), after finding a single failed cap on the mainboard (Korea Chemi-Con LXV 1500uF 10V). The PCB on my PSU is dated 0046, and has a slightly different label (no Chinese writing), however the HP part number is still the same (5185-2974). The tamper-proof label was dated 2001-13.

Before I even opened it, I could see half a dozen blown caps. After destroying the cable tie (connecting the 20-pin ATX cables to the power supply's lid) to access the PSU, I came across a total of eight bulging JPCE-TUR caps, complete with "VENT" on the label (and vent they did) - there was only one Jamicon cap in this PSU on the primary side (between the small transformer and primary cap), and the board is darkened around here - this cap had some very dark, burnt glue on the top but had not bulged or leaked, but it has probably dried out internally. The primary caps are Taicon 330uF 250V (which were 0.06Ω and in spec), and are probably the only good caps inside the whole unit. No wonder the LXV gave out (there were ten LXVs on the PC's mainboard, yet only CE53 failed).

[kc8adu]

Re: Bestec ATX-1523F

am i reading this right?
+5 stby(purple) 28v.
ouch!
new world record for overshoot.
fix that first or risk killing anything you plug it into including power supply testers.

[ben7]

Re: Bestec ATX-1523F

am i reading this right?
+5 stby(purple) 28v.
ouch!
new world record for overshoot.
fix that first or risk killing anything you plug it into including power supply testers.

Daaaaaaannnnng! That is insane!

[Heihachi_73]

Re: Bestec ATX-1523F

Maybe I should have powered up my one for a laugh before I hacked off the mains and PFC cables last night... it might have been good for 12V AC with all the ripple from those JPCE-TURds!

[momaka]

Re: Bestec ATX-1523F

am i reading this right?
+5 stby(purple) 28v.
ouch!

Wow, how did I even miss that!
28V... is... wow! Might as well bring some BBQ sauce the next time that PSU is plugged in .

[c_hegge]

Re: Bestec ATX-1523F

I'm not so convinced. Why hasn't the 5VSB output cap exploded? It would only be rated for 10V.

[kaboom]

Re: Bestec ATX-1523F

I'm not so convinced. Why hasn't the 5VSB output cap exploded? It would only be rated for 10V.

I'd think so, even if it mostly dries up, there'd be enough leakage at 28V that it'd get rather hot.

The power supply does not start, I note that tensions are low + 5VSB (Purple), 28V

Hmm...

Maybe "2.8V?"

Ok is a remedy that I'll keep in mind, when I won't have replacement capacitors.
For the time being I focus on secondary adapter.
There is a large part of the circuit and PS-ON 5VSB.
I don't know, maybe the capacitors are good, and the failure is due to something else (eg. IC3, SCR1, IC5, Q2).

Greetings

You need to remove the riser and remove that glue, in addition to recapping.
The whole supply isn't going to work until you've got proper standby and aux voltages.