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IBM 5160 smoking PSU

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    IBM 5160 smoking PSU

    I got me a pretty IBM XT 5160 yesterday.
    It's been on someone's attic for 1 or 2 decades...
    So I take the thing apart, 5151 included, cleaned the outside and remove all the dust from the inside.
    Everything looked just fine, all the parts are perfect and shiny.
    So I hook it up, power it up and than there is that smell.
    That smell of you did something bad, you let the smoke out!
    I traced the source of the smoke leak to the PSU and guess what?
    The transformer melted on one side!

    I expected some issues with caps or the likes but not the tranny melting?
    Isn't that supposed to be the most solid piece in the PSU?
    Anybody else had similar issues?
    The PSU was an ASTEC AA12151.

    I guess I need to get myself a replacement power supply.
    Any suggestions anyone?

    #2
    The most expensive and hard to find piece, Some manufactures include multiple fuses / fusistors to protect the transformers but if one goes short there's not a lot you can do unless you can find another suitable transformer. PSU's suitable for the 5160 do appear on ebay or some people have gone the transplant route, Find yourself a suitable AT or ATX PSU and transplant the innards into the 5160 PSU case.

    Comment


      #3
      I'm going through a big lot of equipment from a recent pick-up and actually have a PC/XT 63.5W supply, in the box that its replacement came in. Supply tests OK on my D'Asaro Designs load tester, and also runs a 5160 640K motherboard just fine. PM me if you need it, it may be too expensive to ship depending on where you're located. Do note that you'll want a higher wattage supply if you're going to run an old MFM hard disk (I suspect that's why this one was replaced).
      Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

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        #4
        Believe it or not, you can buy one through Amazon.
        Reach me: vcfblackhole _at_ protonmail dot com.

        Comment


          #5
          OK so here's the offending tranny.
          I pulled the plug as soon as I smelled trouble, which was right about after HDD drive spin up completed.
          As you can see damage is not that bad, but black goo started to come out together with some smoke and that smell.

          Is it beyond repair?

          Secondly, if my math is correct wouldn't I need a 130W replacement PSU? :

          Comment


            #6
            Originally posted by Chuck(G) View Post
            Believe it or not, you can buy one through Amazon.
            Thats 63,5W PSU, its little bit risky connect it to the 5160 system with FHT HDD.
            IBM PC 5150(A): IBM PC 5150(B): IBM PC 5160 (64-256k): IBM PC 5160 (256-640k): IBM PC 5170 (099): IBM PC 5170 (319/339): IBM PC 5140: IBM PC 5162: IBM PC 5155: IBM PC Expansion Unit 5161:
            WANTED!: IBM 5175 monitor, IBM 5145 monitor, IBM PC/XT/AT rear screws, Intel INBOARD 386AT card, IBM 5140 keyboard, very early IBM PC (S/N: under 5000)
            My IBM PC hardware collection

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              #7
              Originally posted by Bernie250 View Post
              OK so here's the offending tranny.
              I pulled the plug as soon as I smelled trouble, which was right about after HDD drive spin up completed.
              As you can see damage is not that bad, but black goo started to come out together with some smoke and that smell.

              Is it beyond repair?

              Secondly, if my math is correct wouldn't I need a 130W replacement PSU? :
              You could probably have the transformer rewound; but the cost will far exceed that of a complete replacement power supply.

              Also yes you probably need a 130W if you are running a HDD. Some people have had success using a 63W but the results are sketchy at best.
              System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

              Comment


                #8
                damn. A blown transformer is probably the only part of a PSU (and pcb) that is not feasibly replaceable. Literally anything else can easily be found and replaced. Also, in my experiences transformers generally don't go bad, something makes them fail.

                I can't think of the phrase right now, but I would consider that PSU beyond economical repair. Can we get a few pictures of the damage? It might not be as bad is it has been made out to be.
                It is a mistake to think you can solve any major problems just with potatoes.

                Comment


                  #9
                  AT supplies are still being made. This one should spin your hard drives pretty well. Should be trivial to repackage the thing.
                  Reach me: vcfblackhole _at_ protonmail dot com.

                  Comment


                    #10
                    Here it is :



                    You can see it has deformed underneath the copper foil and the goo coming out the side.
                    I'm not familiar with the schematics of the power supply but since it's not a switched power supply I'm guessing :
                    -mains power is connected to one side (230V in my case)
                    -a rectifier of some sorted on the other
                    -followed by some caps to stabilize the voltage
                    -and then some other parts to split up the voltage into usable levels. (-12, -5, 5 & 12)

                    What do you guys think?
                    Bin it? Of fix it?

                    Comment


                      #11
                      I'd replace the unit. Or do what chuck suggests, and put a "new" supply into the old shell. It sounds like a fun project to be honest.
                      It is a mistake to think you can solve any major problems just with potatoes.

                      Comment


                        #12
                        Looking at the photo it doesn't look blown, deformation under the copper foil is normal. I've never had a switch mode supply where the main transformer died, the feedback transformer in an apple supply yes but never the main one.
                        Is the goo you describe wet?
                        Could it have come from another component?
                        For instance when the RIFA caps blow they spray dark brown goo everywhere.
                        There is no goo inside that transformer to leak out. Just insulated copper wire on a plastic form and lacquer to hold the windings in place.

                        I'd be looking elsewhere for the fault.

                        Comment


                          #13
                          Originally posted by Bernie250 View Post
                          ...I'm not familiar with the schematics of the power supply but since it's not a switched power supply I'm guessing :
                          ...
                          What do you guys think?
                          I think it's a switching supply; what makes you think it isn't?
                          Bin it? Of fix it?
                          Replace it, unless you find a short that only overheated the transformer without actually seriously damaging it.

                          m

                          Comment


                            #14
                            I would also be looking elsewhere. I second you've mistaken a bad conformal coated transformer for blown RIFA's. It's rare for transformers to just randomly burn up.



                            Or, since we know what the fault is and it's supposedly non-repairable, hang a load off it and plug er- right back in for some fireworks.
                            [Need something to waste time on? Click here to visit my YouTube channel CelGenStudios]
                            --------------------------------------------------------------------------------------------
                            [No time for videos? Click here to visit my Twitter feed @CelGenStudios]

                            = Excellent space heater

                            Comment


                              #15
                              word of caution, the magic smoke takes DAYS to fully dissappear. i popped a transistor last week or so. stank my garage up for almost 3 days.
                              It is a mistake to think you can solve any major problems just with potatoes.

                              Comment

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