Bestec "12Z" returns for polycaps

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • everell
    Badcaps Legend
    • Jan 2009
    • 1514
    • USA

    #1

    Bestec "12Z" returns for polycaps

    This is a Bestec ATX-250 12Z. Lots of them out there. I fixed this one some time ago. I decided to modify it using polycaps in the pi output filters on the 12, 5, 3.3, and 5vsb outputs. I used United Chem-Con PSG series 2200 uF/16 volt polycaps. After the modification, all is working well.....so far.

    While taking a few pictures of the 12Z sporting its new polycaps, I had a helper (kitty) who wanted to check out the modification. After looking it over, sniffing it out, she gave her approval and moved on.
    Attached Files
    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30997
    • Albion

    #2
    Re: Bestec "12Z" returns for polycaps

    well done, but in europe the poly's would cost more than the psu.

    Comment

    • Stefan Payne
      Badcaps Legend
      • Dec 2009
      • 1267
      • Germany

      #3
      Re: Bestec "12Z" returns for polycaps

      Originally posted by stj
      well done, but in europe the poly's would cost more than the psu.
      No, Reichelt has Kemet A750.

      Comment

      • Per Hansson
        Super Moderator
        • Jul 2005
        • 5895
        • Sweden

        #4
        Re: Bestec "12Z" returns for polycaps

        Out of curiosity do you have a scope to check the ripple with caps close the the originals and then these new polymers?
        "The one who says it cannot be done should never interrupt the one who is doing it."

        Comment

        • mockingbird
          Badcaps Legend
          • Dec 2008
          • 5484
          • -

          #5
          Re: Bestec "12Z" returns for polycaps

          Very nice.

          Can you please post an updated pic of your PSU stash in your attic?

          Comment

          • everell
            Badcaps Legend
            • Jan 2009
            • 1514
            • USA

            #6
            Re: Bestec "12Z" returns for polycaps

            mockingbird - I think you are jealous. OK, here is some pictures of what is in my attic right now - just took these pictures. All of these were on the way to the garbage. This is my collection since starting this hobby in 2009.
            Attached Files
            Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

            Comment

            • mockingbird
              Badcaps Legend
              • Dec 2008
              • 5484
              • -

              #7
              Re: Bestec "12Z" returns for polycaps

              Amazing!

              Thanks

              Comment

              • PeteS in CA
                Badcaps Legend
                • Aug 2005
                • 3579
                • USA, Unsure of Planet

                #8
                Re: Bestec "12Z" returns for polycaps

                Ah ... power supply porn ......
                PeteS in CA

                Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
                ****************************
                To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
                ****************************

                Comment

                • eccerr0r
                  Solder Sloth
                  • Nov 2012
                  • 8701
                  • USA

                  #9
                  Re: Bestec "12Z" returns for polycaps

                  holy crap...
                  were they all dead and repaired?

                  Comment

                  • Sparkey55
                    Badcaps Legend
                    • Jan 2010
                    • 1523
                    • USA

                    #10
                    Re: Bestec "12Z" returns for polycaps

                    I hope you do not get mice! Or will they hang themselves?

                    Comment

                    • everell
                      Badcaps Legend
                      • Jan 2009
                      • 1514
                      • USA

                      #11
                      Re: Bestec "12Z" returns for polycaps

                      As for the power supplies in my attic, I submit the following thoughts for your consideration.

                      I have been through a two year electronics tech school (United Electronics Institute, Louisville, KY), and I have completed all of the courses and have a 2 year associates degree in Digital Electronics from a two year junior college. No where in all of this schooling was any time devoted to training in computer power supplies.

                      If you want college level training on computer power supplies, the place to get it is right here on Badcaps.net. Colleges charge a hefty price for lab work which accompanies the lecture class. "Lectures" on computer power supplies on Badcaps.net are FREE. Nearly all of the power supplies I use for my lab work have been free. So I think that I have had an opportunity to have a college level course for free, and the lab portion has also been free. I think ALL of us will have to admit that we have learned a lot from this forum. So anytime I find a free power supply, I grab it and stash it in the attic, using what I want when I want. I also consider it a hobby....a very cheap hobby. As for any parts I have to buy, I consider that cost to be very CHEAP compared with the cost of a college lab fee.

                      No, I do not fix computer power supplies to sell, or as a repair service. That would imply warranties and liabilities.
                      Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                      Comment

                      • everell
                        Badcaps Legend
                        • Jan 2009
                        • 1514
                        • USA

                        #12
                        Re: Bestec "12Z" returns for polycaps

                        Originally posted by Per Hansson
                        Out of curiosity do you have a scope to check the ripple with caps close the the originals and then these new polymers?
                        I don't have pictures showing the Bestec with the original caps, but here are some pictures of the +5 and +12 volt outputs with the new poly caps. On each output I looked at no load condition, then with my Biostar M6VLQ pentium 3 test mother board. With no load you can see the spikes at the switching frequency. With the mother board as a load you can see all kinds of things between the spikes.
                        Attached Files
                        Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                        Comment

                        • dmill89
                          Badcaps Legend
                          • Dec 2011
                          • 2534
                          • USA

                          #13
                          Re: Bestec "12Z" returns for polycaps

                          Originally posted by everell
                          I don't have pictures showing the Bestec with the original caps, but here are some pictures of the +5 and +12 volt outputs with the new poly caps. On each output I looked at no load condition, then with my Biostar M6VLQ pentium 3 test mother board. With no load you can see the spikes at the switching frequency. With the mother board as a load you can see all kinds of things between the spikes.
                          Those are some ugly spikes. Too bad you don't have a before, but I would suspect it is substantially worse with the polys.

                          Here are some comparisons, I used the same 50mV and 2uSec scales noted on your scope shoots, this is on an ECS L4VXA2 motherboard running memtest86+.
                          Antec BP350 (FSP):
                          12V:


                          5V:


                          3.3V:


                          L&C (Rosewill Branded) LC-8400BTX (Recapped with Chemi-Con KY/KZE):



                          12V:


                          5V:


                          3.3V:



                          PC Power & Cooling Silencer MKIII 600W (Rebadged Seasonic M12II):

                          12V:


                          5V:


                          3.3V:


                          VIO (Leadman) KY-550ATX (gutless wonder):
                          12V:


                          5V:


                          3.3V:



                          Only the piece of crap VIO(Leadman) has spikes as bad as that 12Z with polymer caps, though the 12Z is cleaner overall.
                          Attached Files
                          Last edited by dmill89; 04-02-2018, 09:15 PM.

                          Comment

                          • Per Hansson
                            Super Moderator
                            • Jul 2005
                            • 5895
                            • Sweden

                            #14
                            Re: Bestec "12Z" returns for polycaps

                            Thanks everell
                            "The one who says it cannot be done should never interrupt the one who is doing it."

                            Comment

                            • goodpsusearch
                              Badcaps Legend
                              • Oct 2009
                              • 2850
                              • Greece

                              #15
                              Re: Bestec "12Z" returns for polycaps

                              Very interesting, thank you both for posting!

                              Comment

                              • momaka
                                master hoarder
                                • May 2008
                                • 12170
                                • Bulgaria

                                #16
                                Re: Bestec "12Z" returns for polycaps

                                Originally posted by everell
                                I think ALL of us will have to admit that we have learned a lot from this forum.
                                Yes, sir!

                                All of my knowledge regarding switchmode power supplies and how to repair them has come from here (some of it indirectly through links to other websites, but nonetheless links that I found on BCN a long time ago).

                                So yes, HUGE THANKS to Topcat for badcaps.net!
                                And of course everyone who has contributed here.

                                Originally posted by everell
                                mockingbird - I think you are jealous.
                                And he may not be the only one that is jealous

                                Originally posted by everell
                                OK, here is some pictures of what is in my attic right now - just took these pictures. All of these were on the way to the garbage. This is my collection since starting this hobby in 2009.
                                WOW!

                                I'm saving these images to my PC for reference now. That way, if anyone (friends or family) tries to tell me I have too many PC parts (especially PSUs), I can conveniently show them these pictures and what "too many" should mean.

                                Also, everell , I think you should go sign up the Guinness World Records book for person with biggest collection of PC power supplies.
                                No seriously, you should consider it, though. There's probably every low and mid-range PSU in that collection.

                                By the way, try to power on these fixed PSUs once every year or two. Otherwise the caps might age much faster in them.

                                Originally posted by dmill89
                                Those are some ugly spikes. Too bad you don't have a before, but I would suspect it is substantially worse with the polys.
                                Agreed.
                                I think many of these cheaper and/or older PSUs are simply not made for poly caps. I find that the only exception is the 5VSB rail, due to being flyback/discontinuous topology. But PSUs like these are often better off even with general purpose caps than polymers.
                                Last edited by momaka; 04-07-2018, 10:20 PM.

                                Comment

                                Related Topics

                                Collapse

                                • Petr0x
                                  Bosch 12V and 18V chargers modification
                                  by Petr0x
                                  Hi, I would like to share with you small modification to your Bosch tool 12V and 18V chargers.

                                  You can use it for almost all Bosch chargers what I have seen, for example part numbers GAL 18V-20, GAL 18V-40, GAL 1880, GAL 18V-160, AL 1820, AL1115CV, AL1130CV.

                                  Bosch (today also other brands using the same system like Wurth, Fein) does not care if you destroy your batteries, because they can sell you new ones. So the marketing is telling you only about speed of the charging, so you will not wait for your batteries to charge too long. Me as a customer want the tools and batteries...
                                  05-24-2024, 01:00 PM
                                • Mgiffune
                                  Samsung UN60EH6000F Black Screen, Backlight and Sound Good. Power Cycle Returns Picture
                                  by Mgiffune
                                  I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.

                                  I ordered a supposedly ‘new' Tcon board this time, and
                                  ...
                                  06-09-2024, 10:28 AM
                                • Califauna
                                  Help with boom box modification
                                  by Califauna
                                  Hi, this is more of a project help request than a troubleshooting question. I hope I can post it here.

                                  I have a W-King D8 Bluetooth boom box which I'd like to modify with some external speaker output jacks and some buttons to switch the internal speakers on and off.

                                  From factory the specs of the boom box are:

                                  -Power Input: DC 5V
                                  -Speaker Output Power: 2 x 25W ( confirmed by Youtube channel Hartdegen review as 12.5W RMS per channel)
                                  -Drivers:
                                  -2 x Woofer, 70mm, 10Ω, 70mm,15W
                                  -2 X Tweeter, 8Ω, 30mm,10W x 2
                                  -Frequency...
                                  12-04-2021, 01:53 PM
                                • sam_sam_sam
                                  Bauer tool battery pack charging with a HERCULES charger modification
                                  by sam_sam_sam
                                  The Bauer power tool battery charger just has to many issues with the charger over heating because I several HERCULES Hercules battery chargers that are 3 amp charge and because they have gone on quite a few times over the years before they came out with the fan cooling battery charger I going to modify one so I can charge Bauer battery packs faster than the crape battery charger that they have

                                  Here is how this modification is going to be done I taking a 1.5 amp hour battery enclosure and gutting it removing the battery cells and replacing some Ryobi 1.5 amp hour battery pack that...
                                  05-06-2023, 12:17 PM
                                • x_orange90_x
                                  Backlight Reflector Modification
                                  by x_orange90_x
                                  I am writing this because I came looking for the same information but couldn't find anything. There are certain model tvs that will have 2 or more different backlight strip configurations and there is often no way to tell exactly what you have without disassembling the panel. Twice now I have run into this issue and ended up ordering the wrong sets BOTH times. The previous TV I reordered the correct ones and went on my way. The second one I had no patience for returns or reorders, let alone peeling the brand new strips back out and risk damaging them.

                                  The number of LEDs per pair is...
                                  03-12-2024, 08:32 AM
                                • Loading...
                                • No more items.
                                Working...