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Corsair RM1000e - Help identify 5VSB Zener diode

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    #1

    Corsair RM1000e - Help identify 5VSB Zener diode

    Hey there guys. I've got a Corsair power supply that's come across my bench dead. I usually don't mess with power supplies, but it's a slow week so I'm giving it a whirl.

    Taking it apart I heard a screw rattling around inside, and when I got it apart I found a couple blown components near what I think is the 5VSB area.

    There's a 22ohm resistor that's melted and open, but it still has the bands.

    The other part is a zener diode and it's top went to jesus, so I can't read the marking.

    It looks like the diode connects the source and drain of a TNY284 through a couple of 2M resistors and a transformer winding.

    Does anyone know what a good value for this zener would be, and what it might be doing?

    Any help much appreciated!


    TNY284 Datasheet: https://www.mouser.com/datasheet/2/3...et-1511375.pdf
    Attached Files
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    #2
    It's most likely 1N4148W.

    Comment

      #3
      1n4148 is a regular diode. Isn't ZD83 supposed to be a zener?

      Comment

        #4
        Have you ruled out that it isn't TVS diode P6KE150A (VR1) or Zener diode 1N5254 (VR2) from the example schematic you posted? (By studying the actual circuit closer/drawing it up more it should be "easy" to see).
        "The one who says it cannot be done should never interrupt the one who is doing it."

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          #5
          I don't know will it help or not.

          This is from CM6502UHH PFC controller typical application circuit and it has TNY227P.

          Resistor is 2M (r45 + r46). On your photo something is behind.
          My wild guess it is sort of hz15-2. Enable pin should be connected to optocoupler.
          Click image for larger version Name: test.png Views: 25 Size: 158.6 KB ID: 3603471
          Attached Files

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            #6
            Click image for larger version Name: image.png Views: 20 Size: 892.1 KB ID: 3603481
            don't take me serious. I'm just studying.
            Attached Files

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              #7
              This is a big help. I'm away from it until Monday, but I'll answer the questions I can remember.

              To optoc? Yes

              20 oh? Bands on resistor are red-red-gold-gold-white. Which I think means 2.2ohm. (see picture)

              Source to gnd? I don't think so. I checked for shorts, and I think source wasn't connected to ground.
              Attached Files

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                #8
                I made a mistake on pic above. Its not 200M its 2M. But overall it fits.

                btw I cant find what is red-red-gold-gold-white. We need some1 to explain.

                Click image for larger version Name: image.png Views: 0 Size: 8.79 MB ID: 3604037

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                  #9
                  Click image for larger version Name: image.png Views: 14 Size: 890.6 KB ID: 3604043
                  changed 200m to 2m.

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                    #10
                    I think the resistor is a 2.2Ω fusible resistor, it looks like it did it's job and is no longer a resistor

                    https://www.engr.siu.edu/staff/spezi...standscode.pdf
                    "The one who says it cannot be done should never interrupt the one who is doing it."

                    Comment

                      #11
                      Originally posted by Per Hansson View Post
                      I think the resistor is a 2.2Ω fusible resistor, it looks like it did it's job and is no longer a resistor

                      https://www.engr.siu.edu/staff/spezi...standscode.pdf
                      so the third golden ring is like blank space in numeral. Interesting.

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                        #12
                        I could be wrong of course, these "special" resistor bands take a bit of guessing: the best way is to have more of the schematic available.
                        Right now I can't see where it connects to so I have no way to make a better educated guess.
                        But if it is before or after the source or drain for example then it is acting as a protection if the MOSFET in the TNY284 gets stuck on...
                        (And if you look at the top-side photo above it seems the PCB around the drain leg is discolored so I'd say this is what has happened).
                        And welcome to Badcaps btw and good job so far with the circuit
                        "The one who says it cannot be done should never interrupt the one who is doing it."

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                          #13
                          Incredible work c1q3, thank you very much. Thanks to you too Per Hansson. I will gather more info and confirm the drawings above when I'm in front of it tomorrow morning

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                            #14
                            It looks like the resistor is a 2.2ohm fusible. I couldn't find the exact one, but this is close: https://www.digikey.com/en/products/...52-2R2/2167125

                            That resistor is connected between 380V and Drain, so yup, it looks like it went pop as intended.

                            Source is connected to GND, and ZD5 connections match, so I think you found it! This looks like an OK replacement: https://www.digikey.com/en/products/...C15-7-F/755469

                            I can't find any shorts, so I'm going to order the diode, the resistor and a new TNY284 and hope for the best. Will report back in a week or so.

                            Thank you both!

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