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Whirlpool dryer control bd part #3978918. Also wp8546219

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    Whirlpool dryer control bd part #3978918. Also wp8546219

    Have a whirlpool duet control board - part #3978918. Also wp8546219. Does anybody recognize what this SMD transistor is ? Also the 2 diodes ?
    xsistor reads R58 P1F
    Attached Files
    Last edited by ajshoe; 12-14-2020, 01:51 PM.

    #2
    Re: Whirlpool dryer control bd

    You will have to clean up the diodes with some acetone and then play with your camera or phone by taking photos at different angles to be able to see what markings are on them. Budm can tell us more about the transistor or regulator of whatever it is.

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      #3
      Re: Whirlpool dryer control bd

      thanks, wasn't sure what to use to get that protectant off.

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        #4
        Re: Whirlpool dryer control bd

        3rd pic i see a cracked solder joint .it might be the problem

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          #5
          Re: Whirlpool dryer control bd

          The transistor is an Onsemi PZT2222AT1, Petehall347 is correct about the poor solder connection, I would check all the larger connections for similar poor solder connections. It might be better to post the actual problem you are having.
          Last edited by R_J; 12-14-2020, 04:38 PM.

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            #6
            Re: Whirlpool dryer control bd

            thats cracked for sure.

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              #7
              Re: Whirlpool dryer control bd

              Yes
              That bad solder joint belongs to K1 heater relay.

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                #8
                Re: Whirlpool dryer control bd

                I see bad solder joint in pic - unfortunately I have 2 boards - one works - other has burnt relay, trans, and maybe diodes. check in morning.

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                  #9
                  Re: Whirlpool dryer control bd

                  looked at both boards - the one that heater relay is burnt - solder joints were good. The good board which I installed and ran 2 loads of clothes was bad but it worked liked that for 2 loads. Fixed solder joints - still works ! waiting on PZT2222AT1 and diodes to repair burnt board. want to thank all who replied - didn't see cold solder joint, I'm pretty sure it would have failed in the near future !
                  Last edited by ajshoe; 12-16-2020, 06:34 PM.

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                    #10
                    Re: Whirlpool dryer control bd

                    ajshoe,

                    Did you get your whirlpool duet control board fixed with the PZT2222AT1 and diodes?

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