RSP1a bricked, DC on RF-input

SDRPlay Independent Community Forum Forums SDRPlay Devices RSP1a bricked, DC on RF-input

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  • #1105
    SDRX
    Participant

      Hello all,
      I bricked my RSP1a with DC on the RF input.

      In another forum I red a discussion, that the RSP1 was AC coupled.
      I did not check that, my fault.
      It is working still, but without reception and without sensivity.

      I looked at the circuit board.
      Behind the input connector, there is a coil (picture a) and then signal is fed to an IC (picture b) with 6 pins.

      Probably this one is damaged.
      Does anyone know what type of IC this is?
      (picture)
      It is labeled with CA1 and EN.

      Thank you much for attention
      SDRX

      • This topic was modified 3 years, 11 months ago by .
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      #1108
      Andy2
      Participant

        The input to the chip will be AC coupled, so the DC should not have damaged it. Maybe the coil in the bias T has melted and gone short-circuit so it is shorting out the signals from the antenna socket? Have you started a support ticket with the guys at SDRPlay? They may be able to repair it, although you will probably have to pay.

        • This reply was modified 3 years, 11 months ago by .
        #1110
        SDRX
        Participant

          Hello Andy2,

          as I dont know the circuit, it could be possible.
          Is this a known problem, when getting DC to the Input?
          I remember, the RSP1a was running about 10 minutes without any problem.
          Maybe I have touched the BiasT button.
          This would be easy to discover, when knowing the coil, unsolder it, and receive would maybe back. If there is not more broken.
          But I dont know where it is.
          Do you have an idea?

          I did a support ticket, but they dont answer. Nevertheless, a service-repair would’nt make sense, because shipping EU <> US is too expensive.
          Only way is to repair it myself, but without idea of the circuit, difficult. Will look at the PCB again…
          Thank you, sdrx

          #1111
          SDRX
          Participant

            Probably I missunderstood the circuit,
            and that the coil I mentioned is just the one. And that the IC is the bias switch.
            Would mean that the RF part is the Sky3414.
            Will unsolder the coil and see.

            #1114
            Andy2
            Participant

              Yes, carefully unsolder the coil and see if the signals come back. You might just be lucky!

              #1115
              SDRX
              Participant

                did it,
                but unfortunaltely it makes no difference.
                Seems there is more broken than that.
                well, SH
                Will see te get a new one…

                Thank you anyway for help… and see you
                sdrx

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