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Generic AT-2005B PSU

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    #1

    Generic AT-2005B PSU

    I recieved this psu with vented JEE caps and some snapped wires. I powered it up and laughed at the 3.3V rail which was 3.6 high!
    It doesn't look that lame so maybe it's worth fixin, I thought. The label claims 400W max output... right.
    Replaced the bad caps along with the tiny 330uF primaries and a thin jumperwire to a coil in the transient filtering. I just used parts what was laying around in the table.
    The rest looked okay. 13009 transistors on the primary, mbr3045 and mbr2040 for 5 and 3.3V Two F1620c for 12V! What a rare generous setup :p

    Powered it up and the 3V rail was still sky high. Adjusted the regulation which helped a little but as soon as I attached some load it climbed back to like 3.5V damn! It doesn't matter if I cut the 3.3 sense wire or play around with the tl431 in the 3V stabilization. Is there a way to solve this somehow?
    At least I can learn something and save it for parts.
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    #2
    Re: Generic AT-2005B PSU

    That's a half decent design there. Will actually do 400W with that transformer and 13009 primaries.

    Interesting bit with the 3.3v rail there. The most that 3.3 sense does is INCREASE the voltage, so there's something else wrong. First try replacing the 431, they fail in weird ways.
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!

    Comment

      #3
      Re: Generic AT-2005B PSU

      I tested an identical PSU and it exploded at 400W.
      I love putting bad caps and flat batteries in fire and watching them explode!!

      No wonder it doesn't work! You installed the jumper wires backwards

      Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

      Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

      Comment

        #4
        Re: Generic AT-2005B PSU

        Originally posted by Th3_uN1Qu3 View Post
        That's a half decent design there. Will actually do 400W with that transformer and 13009 primaries.
        I thought you needed 820uF/200V primaries to do 400W continuously (or 680uF, without PFC and/or a passive PFC), and it looks like the 330uF's were replaced with 470uF's. 400W max can be achieved with 470uF/560uF (200V) primaries with a good enough transformer (unless you can at a line voltage of 230V)?

        Comment

          #5
          Re: Generic AT-2005B PSU

          Looks like a Sun Pro (judging by the "TB" marks on the transformers). generally, I really dislike their PSUs, but this one doesn't seem too bad.

          From what I can see in the pictures, the 3.3V rail on this PSU uses a saturation coil, not a MOSFET in a linear setup with a 431 shunt (if it was, you wouldn't see that toroid next to the middle transformer).

          The only thing I can think of is to put a bigger minimum load on the 3.3V rail. Try a 33 Ohm 1W resistor. If not, try 25 Ohm 1W resistor. If that still doesn't work, take out that coil next to the middle transformer and add a few more turns on it.
          Last edited by momaka; 06-29-2012, 01:47 AM.

          Comment

            #6
            Re: Generic AT-2005B PSU

            Thanks everyone!

            I'll see about the tl431 and the coil. If it works out then I'll put some decent caps there plus 680uF primaries. Too bad I won't be able to fit 820 caps, since the ones I can get are too tall and sort of block the fan.

            Comment

              #7
              Re: Generic AT-2005B PSU

              Originally posted by Th3_uN1Qu3 View Post
              That's a half decent design there. Will actually do 400W with that transformer and 13009 primaries.

              Interesting bit with the 3.3v rail there. The most that 3.3 sense does is INCREASE the voltage, so there's something else wrong. First try replacing the 431, they fail in weird ways.
              Replacing the shunt regulator fixed it! I just noticed that it was running kind of hot too. I think Yageo sy caps are good enough for this thing. I'm going to test the unit... hopefully it won't blow up.

              Comment

                #8
                Re: Generic AT-2005B PSU

                This PSU is indeed a "high end" Sun Pro. I wouldn't trust it with more than 350W.
                I love putting bad caps and flat batteries in fire and watching them explode!!

                No wonder it doesn't work! You installed the jumper wires backwards

                Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

                Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

                Comment

                  #9
                  Re: Generic AT-2005B PSU

                  Originally posted by c_hegge View Post
                  This PSU is indeed a "high end" Sun Pro. I wouldn't trust it with more than 350W.
                  Yep, It is virtually identical to the TM-350 I rebuilt and upgraded a while ago in basic design, with the exception of the overhead 120mm fan, different heatsinks (to accommodate the fan), some input filtering components moved from the AC receptacle to the main PCB (also to accommodate the 120mm fan), and slightly beefier components due to its "50w" higher rating (although neither will do its rated wattage without a few upgrades).

                  Comment

                    #10
                    Re: Generic AT-2005B PSU

                    Yah. It looks identical to the older 420W Thermal Master, even down to the heatsink shape and 120mm fan, although the newer thermal masters are Deer/Solytech built.
                    I love putting bad caps and flat batteries in fire and watching them explode!!

                    No wonder it doesn't work! You installed the jumper wires backwards

                    Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

                    Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

                    Comment

                      #11
                      Re: Generic AT-2005B PSU

                      I have sort of tested the psu with a 3Ghz p4 platform and a couple of hdds, fans for a few days. It worked and wasn't hot. Consumption was 1.1A max according to a cheap tester.

                      Maybe I'll make a virtual load. There is a sale at a local diy shop. I can buy 20-50-100W heatsinked resistors real cheap. Salvage the other stuff like switches and connectors and put it in a box.

                      Comment

                        #12
                        Re: Generic AT-2005B PSU

                        Originally posted by pdavid View Post
                        Replacing the shunt regulator fixed it!
                        I guess I better take note of that.

                        Comment

                          #13
                          Re: Generic AT-2005B PSU

                          Originally posted by momaka View Post
                          I guess I better take note of that.
                          Also it gave me an idea to check all the tl431 in that Chieftec 750 unit which I'm still supposed to fix.

                          Comment

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