RSP1a bricked, DC on RF-input

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

  • This topic has 5 replies, 2 voices, and was last updated by .
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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 2 years, 5 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 2 years, 5 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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