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    #1

    Bestec Power Supply question.

    I had an E-Machines case with a different board in it. It turns out it had a BestTec power supply, so I canned the power supply before it went bad.

    Here's the strange part. The machine had been sitting a while, and now the board won't boot.

    All the fans spin, and the light goes on for the keyboard - no video, no beeps from speakers, and you have to hold the power button to shut it off again.

    It's a Biostar U8668-D board.

    Any suggestions on what to look for? I've tried two known good power supplies, and it doesn't do much. I don't want to just toss another chip into it, just in case it fries it, but none of the caps are obviously bad.

    G-Luxon for the 8mm, and OST for the 1cm caps.

    I haven't pulled it out of the case yet, because I wanted to get opinions first.

    BW
    Tags: None
    #2
    Re: Bestec Power Supply question.

    get the BIOS battery out and reset the CMOS (there should be a jumper somewhere near the battery for this)

    Link to the manual (look for the Revision printed on the board!)
    http://www.biostar.com.tw/app/en-us/...t.php?S_ID=242

    edit: for example..
    Revision 7.x and revision 5.x all have 3 PCI Slots, Rev. 1.x and 6.x only 2..
    so there may be some other differences in the PCB layout..
    Last edited by Scenic; 02-26-2008, 01:39 PM.

    Comment

      #3
      Re: Bestec Power Supply question.

      Tried that, but I'll do it again, just in case - I do this for a living, so I'm familiar with the basics - I'm just not familiar with troubleshooting other components than caps on the board.

      Comment

        #4
        Re: Bestec Power Supply question.

        Okay - I think I may have found an issue, but I don't know exactly how to fix it.

        The three caps by the coils are sitting at 1.6 volts.
        One cap by the mosfets is sitting at 11.95 volts.
        The other cap by the mosfets is sitting at 1.6 volts.

        I'm thinking there's a problem somewhere in there

        Comment

          #5
          Re: Bestec Power Supply question.

          oops. Nope, it was a 16v on the 12v line, so it's not that.

          I may just pitch the board, rather than waste a couple of hours putting caps into it.

          I guess I could try a different proc, but I don't want to nuke a good proc if the board's gone out.

          Comment

            #6
            Re: Bestec Power Supply question.

            The 1.6V is probably Vcore, there would normally be several of those in parallel. The 16V cap is probably handling the 12V input from the power supply, before it gets regulated down to Vcore. Your readings make sense - I don't think it would fry a processor. But to be safe you could try the opposite - put the questionable processor in a known working board.

            Comment

              #7
              Re: Bestec Power Supply question.

              G-Luxon and OST are both high failure rate caps on motherboards.
              -
              Odds are those caps are the only problem with the board.
              -
              G-Luxon's usually pop the top.
              OST may or may not and still be bad.
              Mann-Made Global Warming.
              - We should be more concerned about the Intellectual Climate.
              -
              Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
              - Dr Seuss
              -
              You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
              -

              Comment

                #8
                Re: Bestec Power Supply question.

                Bestec has such a terrible reputation... why not throw it away before exposing a working board to devastation?

                All the Bestec I have removed are already underpowered and not worth anything, even with good caps.

                Yuck.

                Comment

                  #9
                  Re: Bestec Power Supply question.

                  Well, I have piles and piles of caps - unfortunately, not of the 3300's. just 2200uF's (I have some 3300's.)

                  I didn't realize it had a bestec power supply. y'see, it was a case with a roasted board in it, and I thought the power supply had been replaced.

                  So another board was put in it, and worked for a while, then I shut it down and put it in a corner.

                  Yesterday, I opened it up, went "Crap", and stuffed in a better PS. It wouldn't fire up. The Bestec power supply is still roughly reporting the right voltage (Thermaltake brand tester - I know it just tests light load voltage), so I figured it wouldn't have had a chance to kill the board - since it was working when put away, and replaced before powered up

                  Ah well - I'll probably recap anyway.

                  Comment

                    #10
                    Re: Bestec Power Supply question.

                    Here's my solution to Bestec:

                    http://www.newegg.com/Product/Produc...Fortron+Source)
                    A man convinced against his will is of the same opinion still.

                    Comment

                      #11
                      Re: Bestec Power Supply question.

                      Some of the Bestec 250w units used in OEMs (Gateway/Dell/HP/eMachines) had a bad habit of blowing out chipsets.
                      One particular cap would blow hard and nail the chipset with a voltage spike of death.
                      -
                      I don't know if other watt Bestecs were built with that same problem.
                      Mann-Made Global Warming.
                      - We should be more concerned about the Intellectual Climate.
                      -
                      Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                      - Dr Seuss
                      -
                      You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                      -

                      Comment

                        #12
                        Re: Bestec Power Supply question.

                        Originally posted by PCBONEZ
                        Some of the Bestec 250w units used in OEMs (Gateway/Dell/HP/eMachines) had a bad habit of blowing out chipsets.
                        Um.... did Dell ever use Bestec PSUs in their systems?? I have never seen a Dell with a Bestec. Usually they use HiPro, Delta and Newton. I could be wrong though. Can someone confirm that with me?.

                        I know that E-Machines, HP and Compaq have Bestec though.

                        Thanks.
                        Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous

                        Comment

                          #13
                          Re: Bestec Power Supply question.

                          I'm not sure about Dell-Bestec.
                          I was just throwing out the common OEM's.
                          .
                          The exact model with the big problem was the Bestec Atx250-12e.
                          [Dunno if similar models had the problem or not.]
                          See note:
                          http://www.skyline-eng.com/index.cfm...roduct_ID=5610

                          -
                          Know for a fact that Gateway, eMachines, and HP used them because I've come across people on EE that had them as original. (Or so they said.) Some even showed up in low end P4 and Athlon XP systems. Probably more were used in eMachines than the others. Emachines used a LOT of them.
                          -
                          They were also sold as OEM replacements so they can show up anywhere.

                          .
                          Mann-Made Global Warming.
                          - We should be more concerned about the Intellectual Climate.
                          -
                          Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                          - Dr Seuss
                          -
                          You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                          -

                          Comment

                            #14
                            Re: Bestec Power Supply question.

                            Here's my solution to a Bestec PSU: http://www.aspli.com/prdimgs/060006.jpg


                            Edit: This works too: http://uk.youtube.com/watch?v=6zCI8X3CVcg
                            Last edited by Harvey; 02-27-2008, 06:21 PM.

                            Comment

                              #15
                              Re: Bestec Power Supply question.

                              That's STUPID!

                              That's one of the best ways to ruin an axe that there is!

                              If that freaking moron wanted to break them up, he should have used the hammer side of the ax, or a sledge hammer.

                              Comment

                                #16
                                Re: Bestec Power Supply question.

                                I just did a client setup on a new Dell Vostro 200 machine. It came with a Bestec 160w power supply.

                                This machine has an E6550 Conroe at 1333 FSB and Series 3 chipset. I have no experience with Samsung SATA drives, but assume this was a cost cutting model.

                                I advised the client that Bestec are known to fail and take boards with them, and to replace this PSU as soon as possible.

                                Comment

                                  #17
                                  Re: Bestec Power Supply question.

                                  Other than random, I only know of problems with the one model. Bestec Atx250-12e
                                  -
                                  If other models have the same problem I'd like to know the numbers.

                                  THX
                                  .
                                  Mann-Made Global Warming.
                                  - We should be more concerned about the Intellectual Climate.
                                  -
                                  Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                                  - Dr Seuss
                                  -
                                  You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                                  -

                                  Comment

                                    #18
                                    Re: Bestec Power Supply question.

                                    I just pulled a Bestec ATX-250-12Z Rev. D1 from an HP Pavillion a545c tower. This is an Athlon 3200-XP on an Asus A7V8X-LA board, VIA KM400 on board.

                                    I didn't even have to open it up... looking through the vent holes reveals at least three caps that have blown lunch all over the inside of the PSU.

                                    The good news is, the board survived. It has KZG installed, which bothered me, but they seem to have also survived. The complaint was failing video. It would just go away while the machine kept running.

                                    Comment

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