WATER infra red TAP !

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  • nguberinic
    Member
    • Sep 2012
    • 27
    • Serbia
    #1

    WATER infra red TAP !

    Hi guys, need little help if possible.

    I will post a pcb with some weird markings on optocouplers/photocouplers not possible to find. I guess some weird protection design.
    PCB itself powers from 2cpr Battery rated 6V, 1.4A.
    It has a 2/2-way solenoid cartridge servo controlled valve to be run as soon as infra and photo led catches something and send the current to servo..

    Since I have 3 identical taps, 2 are with same burnings/should I say optocoupler.

    If you can help me determining which optocoupler should I replace it with would me a great thing for me......
    Thanks !

    P.S Second picture is a picture of still working pcb, and you can see that markings on optocoupler differs from the previous pcb. Second picture is a full pcb layout!
    Attached Files
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: WATER infra red TAP !

      I doubt that that they are Optocoupler, it useless to have Optocoupler for isolation between the two circuits with the traces layout like that and the way they are connected. Optocoupler is low current device limited by the resistors for the sender and receiving side.
      Also look at the bottom 3 legs of the E2RS8 how the two legs are connected together and how the two resistors are connected.
      Can we see straight shot pictures of the whole board and how the board are connected to?
      Also more information about this device make and model.
      Last edited by budm; 11-03-2017, 08:44 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

        • nguberinic
          Member
          • Sep 2012
          • 27
          • Serbia
          #3
          Re: WATER infra red TAP !

          Here are the pics!
          Thank you for your help !
          Attached Files

            Comment

            • nguberinic
              Member
              • Sep 2012
              • 27
              • Serbia
              #4
              Re: WATER infra red TAP !

              Originally posted by nguberinic
              Here are the pics!
              Thank you for your help !
              There is a lmv358 which hardly can be seen from the hole board view pic kind of !
              But here is a clear shot of it !
              Attached Files

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: WATER infra red TAP !

                  OK, so it is the water faucet controlled valve.
                  If you power up the unit, using your digital camera you should see one of those LED glow.
                  Need to trace out the board, I think the device that burnt up is the power device that drives the solenoid valve.
                  Attached Files
                  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

                    • redwire
                      Badcaps Legend
                      • Dec 2010
                      • 3906
                      • Canada
                      #6
                      Re: WATER infra red TAP !

                      I believe OP also posted this here: https://www.eevblog.com/forum/beginn...13/#msg1343713
                      MOSFET IC is DMN5L06DMK

                        Comment

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