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LNB circuit overload

expat-66 Posted messages 3 Status Member -  
expat-66 Posted messages 3 Status Member -
Hello,

The TV distributor's power supply was changed due to a surge. My antenna technician checked that he was receiving the channels at the end of my coaxial cable using a portable device. However, when the cable is connected to the SAT input of my decoder, the latter displays the LNB overload message as if the problem were external to the decoder. How can we make sure that the problem actually comes from the decoder?

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3 answers

  1.
    expat-66 Posted messages 3 Status Member 2
     
    Hello,

    Yes, I am in a building with a collective satellite dish.
    The cable coming from the LNB arrives at a box in a technical room where all the TV cables from the apartments are connected.
    My personal cable runs from this box to my wall socket. From this socket, a cable is connected to the SATellite input of my decoder.
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    1. expat-66 Posted messages 3 Status Member 2
       
      Hello,

      I am sure that it is my decoder that is the issue. At my neighbor's, who has the TV, my decoder shows the same error message. Although the splitter is not powered, there has still been a voltage surge on my decoder, probably due to the power supply of the preamp that has blown.
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  2. matousurnet Posted messages 1179 Registration date   Status Member Last intervention   506
     
    Hello,
    Wow wow....

    Either you're confused or I don't understand anything...

    "The power supply for the TV splitter has been changed": that's not possible, a splitter is never equipped with a power supply. It’s probably the power supply for the pre-amplifier that is located in the TV installation (via antenna)
    Your antenna technician surely checked that the signal was arriving at the end of your cable (but the cable from the antenna? Or the cable from the satellite dish?)

    Because the follow-up is mysterious: "when the cable is connected to the SAT socket of my decoder" we would need to know the type of satellite decoder? (Canal +, Orange, Fransat, other?)
    This implies a satellite dish " overload of the LNB" means that the dish's head is short-circuited or receiving too much current

    So either you have a satellite dish that uses a splitter which should never be done (one demodulator, one cable)
    and if you are on an antenna cable it makes sense that the decoder cannot function

    But all this, an antenna technician knows and he also knows how to proceed (and at least he would explain it to you)

    Or your explanation doesn't fit somewhere....
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  3. expar-66
     
    Good evening,

    Thank you for your response.
    It's possible that the power supply of a pre-amplifier, as you suggested, has failed.
    I don't know much about it, but now I understand that a TV splitter does not have a power supply.
    The reception test with the portable device from the antenna technician was done at the end of my TV cable in my apartment. This same cable, once connected to the satellite input of my decoder, causes this overload message during the decoder's boot process. I conclude that my decoder has experienced an overload, but if you say that the failed power supply is not relevant to my connection to the dish, then I'm having a hard time understanding what could have happened to damage my decoder.
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    1. matousurnet Posted messages 1179 Registration date   Status Member Last intervention   506
       
      Hello,
      So you live in an apartment building? (or at least in a collective housing)

      Does the tested cable come into your apartment? Normally, this incoming cable from the landing goes to the low voltage cabinet (TV, phone, internet) and then connects to the TV socket in the wall, and it is from this socket that you plug in a cable that goes to your decoder...
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