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    samsung dryer control board

    have a Samsung dryer model #DV45H7000 with no heat. problem is control board - has a bad diode. can't figure out what type of diode it is or what to replace it with. control board is part #DC92-01626B - diode is D18 on board (under magnifying glass looks like W2). If anybody has a replacement that will work - thanks.
    Attached Files
    Last edited by ajshoe; 03-26-2020, 01:19 PM.

    #2
    Re: samsung dryer control board

    something like this?
    https://cdn.badcaps-static.com/pdfs/...bb1ad24c2c.pdf

    Comment


      #3
      Re: samsung dryer control board

      Thinking could use a 4007 ? Just tirns on 12v relay.

      Comment


        #4
        Re: samsung dryer control board

        the 1n4007 isn't high speed switching, but a 1n4148 is.

        Comment


          #5
          Re: samsung dryer control board

          on diode test with volt meter:
          D14 open .56V
          D18 .24V .24V
          D20 open .56V

          I'll put a 1n4148 in place and test it. thanks

          Comment


            #6
            Re: samsung dryer control board

            D14 is the snubber diode (1N4007 will do), as you can see, it is connected in parallel with the relay coil.
            I cannot see how D14 and D18 are connected in the circuit, if they are also snubber diode for relay coil then 1N 4007 will also work.
            BTW, you test these relay coil snubber diode in circuit, you will get false reading due to the DCR of the relay coil which is connected in parallel with the Diode.
            Last edited by budm; 03-26-2020, 04:36 PM.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment


              #7
              Re: samsung dryer control board

              Turns out that diode D18 is good out of the circuit. Ohms out like a 1n4148
              Last edited by ajshoe; 03-26-2020, 04:51 PM.

              Comment


                #8
                Re: samsung dryer control board

                i guess you have to dig deeper... that wasnt it.
                Last edited by CapLeaker; 03-26-2020, 05:44 PM.

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                  #9
                  Re: samsung dryer control board

                  will test bad on board with it being in parallel with the relay coil .

                  Comment


                    #10
                    Re: samsung dryer control board

                    hate these control boards ! whole story on this - heater coil relay was bad on board( dryer turned on - tumbled, no heat. after diagnostics, realized the heater relay contacts were bad. took some time but I pried control board out of the plastic shroud that it was "glued or epoxied in" and possibly ruined a trace or twisted the board which could have broke a trace of solder connection. replaced bad relay with new one - now the motor doesn't turn on. That glue was nasty - like rubber cement. I did find a broken trace - repaired it. still no motor turn on. tomorrow - i'll check solder connections around relays.

                    side note - I have a second (good) control board and with it installed - dryer works perfectly
                    Last edited by ajshoe; 03-26-2020, 06:21 PM.

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                      #11
                      Re: samsung dryer control board

                      Do you have any voltage on the secondary output capacitors of of the switching power supply board

                      Because it has a TNY277 it looks like I have found a few of this type of switching power supply regulator going bad or just plan bad

                      When I see this type of switching power regulator I just replace them if I am having problem with the power supply
                      9 PC LCD Monitor
                      6 LCD Flat Screen TV
                      30 Desk Top Switching Power Supply
                      10 Battery Charger Switching Power Supply for Power Tool
                      6 18v Lithium Battery Power Boards for Tool Battery Packs
                      1 XBox 360 Switching Power Supply and M Board
                      25 Servo Drives 220/460 3 Phase
                      6 De-soldering Station Switching Power Supply 1 Power Supply
                      1 Dell Mother Board
                      15 Computer Power Supply
                      1 HP Printer Supply & Control Board * lighting finished it *


                      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                      2 Hem Saw Computer Stack Board

                      All of these had CAPs POOF
                      All of the mosfet that are taken out by bad caps

                      Comment


                        #12
                        Re: samsung dryer control board

                        turns out nothing was wrong with control board except I scratched some traces on board when removing gunk around components. Samsung has some of the worst documentation on their products. turns out there was a contactor broken on the motor contacts. These contacts tell the control board the motor is running and then enables the heater circuit to turn on. anyway - dryer works perfectly now.

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