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LG nb3530a Zener Diode Identification

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    LG nb3530a Zener Diode Identification

    Ive got a shorted zener diode on a power board for a sub but struggling to make sense of the markings to identify a replacement.

    From what i can make out says 33B5T

    This is what a google brings up

    https://datasheetspdf.com/pdf/102878...ents/MZC33B5/1

    Was looking at this as a replacement 3.3v Is this suitable?

    https://www.ebay.co.uk/itm/161636082...Cclp%3A2334524
    Attached Files
    Last edited by SMDFlea; 08-13-2021, 12:05 PM. Reason: LG nb3530a

    #2
    Re: Zener Diode Identification

    What Make & Model sub? it could be a 33v zener (33BST)

    Comment


      #3
      Re: Zener Diode Identification

      Originally posted by R_J View Post
      What Make & Model sub? it could be a 33v zener (33BST)
      It’s just a wireless sub part of a LG sound bar setup


      LG nb3530a

      Actually found another shorted zener directly after a octocupler from the primary to secondary side.

      I’ll get some board pics up shortly

      And yes the 5 could be a S, so 33BST

      I’ve just bought a kit of Amazon which includes loads of values
      Last edited by mikay786; 04-24-2021, 08:10 PM.

      Comment


        #4
        Re: Zener Diode Identification

        I have the same problem and I stumbled upon this thread.

        Did you manage to solve your problem? If so what value zener diodes did you use as replacements?

        I have two shorted zeners on the output of the optocoupler. One zener diode on the feedback pin and one on VCC. The feedback pin has a max rating of 5V and VCC has a max rating of 25V. Wouldn't this mean 33V zeners are unsuitable?

        Comment


          #5
          Re: Zener Diode Identification

          Originally posted by mikay786 View Post
          I've just bought a kit of Amazon which includes loads of values
          like mine?
          https://www.aliexpress.com/item/1005001780550855.html

          Comment


            #6
            Re: Zener Diode Identification

            Originally posted by CrimsonKyber96 View Post
            I have the same problem and I stumbled upon this thread.

            Did you manage to solve your problem? If so what value zener diodes did you use as replacements?

            I have two shorted zeners on the output of the optocoupler. One zener diode on the feedback pin and one on VCC. The feedback pin has a max rating of 5V and VCC has a max rating of 25V. Wouldn't this mean 33V zeners are unsuitable?
            why not read the print on the shorted ones?

            Comment


              #7
              Re: Zener Diode Identification

              Originally posted by stj View Post
              why not read the print on the shorted ones?
              The print reads 33B5T and I can't find any information regarding the values online. I've been searching for the past few hours for a data sheet that looks something like but I've had no luck.

              Comment


                #8
                Re: Zener Diode Identification

                Rather, a regular 33v zener diode (stands in the role of power protection).

                Comment


                  #9
                  Re: LG nb3530a Zener Diode Identification

                  found a circuit for the power supply:
                  ZD901 - 33V
                  ZD902 - 22V
                  ZD906 - 10V
                  ZD908 - 5.1V
                  Attached Files

                  Comment


                    #10
                    Re: LG nb3530a Zener Diode Identification

                    Very helpful info - thank you.

                    Comment


                      #11
                      Re: LG nb3530a Zener Diode Identification

                      yep, standard design appears to be to use a 33v zener in that position

                      Comment

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