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CRT television emitting gray smoke

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Pierr10 Posted messages 13824 Registration date   Status Moderator Last intervention   -

Hello,

Today I’m fixing my TV that I found at the dump when suddenly it started to smoke gray and make strange noises. I think the cathode ray tube has failed, but I would like an outside opinion.


3 answers

  1.
    Pierr10 Posted messages 13824 Registration date   Status Moderator Last intervention   5 840
     

    Hello

    The only thing to do is to take this television to the dump, where it should never have come from.

    What is well conceived is clearly stated,
    And the words to say it come easily.
    (Boileau)

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  2. MPMP10 Posted messages 47331 Registration date   Status Member Last intervention   18 957
     

    Hello,

    It's difficult to know exactly from a distance via a forum; you need to open it up to determine which component is causing a problem, and above all, you need a certain level of expertise in this area.

    when all of a sudden it started smoking gray and making weird noises

    But the real question is, "do you really want to take the risk of starting a fire with a completely obsolete and useless television..." and from another era?

    A dead tube also remains gray or even whitish...

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    1. georges97 Posted messages 14578 Registration date   Status Contributor Last intervention   2 923
       

      Hello,

      It needs to be opened to determine which component is causing a problem.

      Personally, I would avoid doing it. It's not just the potential fire hazard, but also the well-known risks of electrocution for former users of cathode ray televisions (25,000 volts if I remember correctly, I do mean 25 times a thousand volts) and the risk of explosion from high-capacity electrolytic capacitors.

      https://en.wikipedia.org/wiki/High_voltage#:~:text=High%20voltage%20is%20a%20term,example%2C%20for%20a%20color%20set.

      It's a bit like base jumping without prior training.

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      1. MPMP10 Posted messages 47331 Registration date   Status Member Last intervention   18 957 > georges97 Posted messages 14578 Registration date   Status Contributor Last intervention  
         

        Hello,

        "it needs to be opened to determine which component is causing a problem and above all, a certain level of skill in this area is required." also regarding the risks of electrocution!

        This passage is also under the time that it should be opened by a professional regarding the skills.

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      2. georges97 Posted messages 14578 Registration date   Status Contributor Last intervention   2 923 > MPMP10 Posted messages 47331 Registration date   Status Member Last intervention  
         

        Good evening MPMP10,

        I did not want to undermine your recommendation, which I wholeheartedly agree with. I wanted to emphasize that one should not open this type of device lightly, something the requester does not seem to be aware of.

        If he does not agree, at least our warnings will serve other readers.

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      3. Pierr10 Posted messages 13824 Registration date   Status Moderator Last intervention   5 840 > georges97 Posted messages 14578 Registration date   Status Contributor Last intervention  
         

        Good evening

        Absolutely agree.

        In a cathode ray tube television, there are very high voltages required to accelerate the electrons.

        After turning off and unplugging the television, there may still be capacitors charged with high voltage, which is obviously dangerous.

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  3. mariam-j Posted messages 1656 Registration date   Status Member Last intervention   39
     

    Hello,

    I would rather think of the flyback transformer or a capacitor that is burning out.

    The tube has no reason to burn.

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