"Ole blue" power supply

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  • mockingbird
    Badcaps Legend
    • Dec 2008
    • 5484
    • -
    #41
    Re: "Ole blue" power supply

    Ok, turns out I had one of the voltage selection wires soldered in the wrong place...

    Checked the primary voltage again, one cap is reading 160+, the other is reading 0 volts. 5VSB still showing 0.

    edit:

    bah! I should have taken down better diagrams when I overenthusiastically took this thing apart years ago... I need an identical one to see which wire goes where exactly. Young Year was a bit quirky with the PCB labeling.
    Last edited by mockingbird; 02-19-2013, 01:25 AM.

      Comment

      • momaka
        master hoarder
        • May 2008
        • 12175
        • Bulgaria
        #42
        Re: "Ole blue" power supply

        It's a simple voltage doubler circuit. Just follow the traces on the board. One of the voltage selector switch wires should be connected to neutral right before the bridge rectifier. The other should be connected to the midpoint between the two caps (that is, the point where one of the main cap's (+) side is connected to the other main cap's (-) side).

        Also, check your bridge rectifier. Normally, a bad bridge rectifier would cause a fuse to blow and the chance of a diode going open circuit are next to none (but still, it is possible).

          Comment

          • mockingbird
            Badcaps Legend
            • Dec 2008
            • 5484
            • -
            #43
            Re: "Ole blue" power supply

            Ha ha... I finally got the thing working -- I think...

            One wire, as you said, between the two caps, and the second cap needed to be connected to the second leg of the bridge rectifier... 160V on both big caps and the most important thing, 5VSB voltage is present!!! Yay. Long live Young Year.

            Now I need to hook it up and see if it actually powers a computer up. Thanks everyone.

              Comment

              • ratdude747
                Black Sheep
                • Nov 2008
                • 17136
                • USA
                #44
                Re: "Ole blue" power supply

                I don't think I posted this ages ago, but out of the blue (pun intended?) it started running on the revised power rail setup... until maybe a year later or so (IDK how long) and last night she died.

                I don't know what happened... I'll investigate later. Stupid Ultra POS.
                sigpic

                (Insert witty quote here)

                  Comment

                  • everell
                    Badcaps Legend
                    • Jan 2009
                    • 1514
                    • USA
                    #45
                    Re: "Ole blue" power supply

                    What kind of computer was "ole blue" powering?
                    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                      Comment

                      • ratdude747
                        Black Sheep
                        • Nov 2008
                        • 17136
                        • USA
                        #46
                        Re: "Ole blue" power supply

                        Intel DP35DP with a PDC, lower end GPU. The PSU was overkill.
                        sigpic

                        (Insert witty quote here)

                          Comment

                          • Pentium4
                            CapXon Be Gone
                            • Sep 2011
                            • 3741
                            • USA
                            #47
                            Re: "Ole blue" power supply

                            Were you still getting 5VSB?

                              Comment

                              • everell
                                Badcaps Legend
                                • Jan 2009
                                • 1514
                                • USA
                                #48
                                Re: "Ole blue" power supply

                                That Intel board looks like a really nice board. If you have to retire "ole blue", I can send you "new blue" posted earlier.
                                Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                                  Comment

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