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The TV clicked (pop, pshhh...) when plugging in the power.

Ordralfabetix -  
mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   -
Hello,

I was given a Samsung flat-screen television yesterday, without a power cable. I bought one this afternoon that seemed suitable (three-pronged plug), with the store seller assuring me it was standard.

When I made the connection, the TV's standby light turned on for a few seconds, and I heard a small pop, followed by a burnt smell coming from the TV. I should mention that the connection was made to an old power strip, which might have played a role...

In short, without too much hope, I would like to know if anyone can tell me what happened and if it's serious...

Thank you in advance for your suggestions,

9 answers

  1.
    Pierrecastor Posted messages 10830 Registration date   Status Moderator Last intervention   4 215
     
    Hi

    There's a good chance that the power supply capacitors are blown. The good thing is that they can usually be replaced with some disassembly of the TV and soldering.

    But before that, you should determine why it blew.

    Check if there’s a little 110/220 switch somewhere on your power supply.

    Something like this:

    http://www.x86-secret.com/pics/enermax/alimder.jpg

    -- Light a fire for someone and they will be warm for the rest of the day. Set a man on fire and he will be warm for the rest of his life. -Terry Pratchett-
    2
    1. Ordralfabetix
       
      No, nothing like that; it's more like this: https://cdns.4clik.com/ecran-lcd/TV66/samsung-le19c450-pic-11-lg.jpg

      What seemed completely standard to me, hence my surprise!
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    2. mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   1 123 > Ordralfabetix
       
      Can you give us the exact reference for the TV?
      And what’s your level in DIY? (with a little extra in electricity?)
      Because in my opinion, if you were already doing some electronics, you wouldn't have asked your question here.
      0
    3. Ordralfabetix
       
      The model is as follows: LE23T51B s (that's what's written on the back of the television)

      And indeed, well spotted! I know nothing about electronics, I think I can perform simple manipulations if there's a change to be made, but not knowing how to identify the components or their function is what prompts me to seek help for a diagnosis; I am not able to determine if the device is damaged deeply or if it's superficial.

      Thank you anyway, (to all those who write here), for your attention and kindness!
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    4. mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   1 123 > Ordralfabetix
       
      ok, very old model
      so after reading the warnings from my colleagues a bit lower down, are you ready to take apart the back of the TV to give us a little photo session of the power board?

      To reassure you (and my colleagues at the same time), for now we are not touching anything....

      Also, I would like to know if you have two left hands when it comes to DIY.
      0
    5. Ordralfabetix
       
      I'm ready to do it! I just need to find a screwdriver of the right size and get home after the weekend: I'll send you a photo next week.

      I don't think I have two left feet; it's my knowledge on the subject that is limited, but I think I'm skilled enough to let myself be guided blindly if there's something to do (anyway, I don’t think I have anything to lose; at worst, I’ll have learned something).
      0
  2. Sergio39 Posted messages 5315 Registration date   Status Contributor Last intervention   2 622
     
    Re...
    Could you take a photo... just a bit clearer and more horizontal... (as if I’m taking a picture facing you instead of above you)... I know, not easy.... otherwise, post several photos from different sides.
    Take the opportunity to check if there are any swollen capacitors (see link)
    https://www.google.fr/search?q=condensateur+gonflés&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi757KhmJLTAhUFWxoKHYBmBsUQ_AUIBigB&biw=1900&bih=899#spf=1

    --
    Life is like a bicycle... you have to keep moving to avoid losing your balance... EINSTEIN.
    1
    1. mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   1 123
       
      re,
      nothing special seen when zooming, but given the clarity of the photo ....
      is it also possible to see the back of the power card?
      0
      1. Pierrecastor Posted messages 10830 Registration date   Status Moderator Last intervention   4 215 > mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention  
         
        For me, there's definitely something strange about the round CS801 capacitor that looks like it has blown. You can even see black stains on the board.
        0
    2. mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   1 123
       
      Hi Pierre Castor,
      I'm not sure, it seems to me that it's their component glue that burned due to the heating of the resistor.
      Look at their glue paste between the capacitor and the resistor on the same power boards for sale.
      https://spares2repair.co.uk/images/samsung/Samsung%20LE23T51BR%20-%20PSU%20-%20BN96-02580A%20-%20Rev%201.1.jpg
      http://www.recampro.com/download/bancorecursos/Fersay/productos/BN96-02580A.jpg
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  3. Sergio39 Posted messages 5315 Registration date   Status Contributor Last intervention   2 622
     
    Good evening,
    First of all, your old power strip has nothing to do with the situation.
    I think this television has been stored… and the time + the storage conditions + the age of the television have done the rest.
    Regarding the component(s) that have "burned out," it could be the power supply, which is generally the first thing to fail.
    In any case, do not try to repair anything and rather ask a technician to come and identify the cause.
    Be careful, check the labor and travel rates to avoid any unpleasant surprises.
    Best regards

    --
    Don't forget to mark your post as "resolved" once the issue is fixed. Thank you.
    0
    1. mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   1 123
       
      Hi Sergio,
      it's not a big deal to change a condo when you're a bit handy.
      0
      1. Pierrecastor Posted messages 10830 Registration date   Status Moderator Last intervention   4 215 > mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention  
         
        Hi

        I confirm, a condo can be replaced without too much hassle.

        However, I didn't think to mention that you should only undertake this kind of operation if the TV is no longer under warranty.
        0
  4. Sergio39 Posted messages 5315 Registration date   Status Contributor Last intervention   2 622
     
    Hi Mushu
    Whoa.. I'm not going to be as optimistic as you.
    Electronics aren't just a light bulb to change, and if there are other burnt components and we can't see the references anymore, it's a whole different story.
    Don't forget to mark your post as "resolved" once the problem is fixed. Thank you.
    0
    1. mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   1 123
       
      we're not there yet, don't worry ^^
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  6. Jojolaguitare Posted messages 12012 Registration date   Status Member Last intervention   2 783
     
    Hello.

    >>>Electronics is not just a lightbulb to change<<<<

    And how right you are!... Because we're already dealing with the power supply. And if our friend touches the pins of the primary capacitor (310 volts) without having discharged it beforehand, I can assure you he will get a shock! If you add to that that he has heart problems and uses a pacemaker, that's a recipe for disaster.

    For us, changing a capacitor doesn't seem like a problem. Personally, I've changed hundreds (and yes, I’ve also picked up some messes :) But for someone who doesn't practice electronics, I advise against touching anything. It's better to see a repair technician.

    For my part, I would blame the voltage regulator. In the power supply of VCRs, for example, it's often the one that burns out. It's an 8-pin integrated circuit. But as Pierrecastor says, whether it's a capacitor or an IC, you need to determine where the problem originated.
    And that's less easy to find.

    Have a good day everyone...

    --
    There's no point in rushing; you have to start on time...
    0
    1. Ordralfabetix
       
      Hello,

      Thank you for your response as well. I am indeed looking to understand first of all what might have happened and what is damaged. Do you know how to go about getting such a diagnosis before I decide to give up on the matter or, on the contrary, to do something? I didn't budget for a TV repair (around €0) originally...

      Thank you and have a nice day everyone!
      0
  7. Jojolaguitare Posted messages 12012 Registration date   Status Member Last intervention   2 783
     
    Re.

    Unfortunately, a remote repair is impossible. While a simple multimeter is sometimes sufficient to detect a minor fault, in your case it's more complex. An oscilloscope is needed. Without this device, it's a bit of a struggle to pinpoint a tricky fault. Moreover, often repair technicians use the TV's electrical schematic and have the effective voltages to check.

    On the other hand, personally, television isn't really my area. My field is low frequency, in other words, sound system amplifiers or instrument amplifiers. So it's unrelated.

    Sorry I can't help you more . . .

    Best of luck . . . Bye

    --
    There is no point in running; you must leave on time . . .
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  8. Ordralfabetix
     
    Hello

    Better late than never (no camera...), I was able to photograph the inside of the TV, where I noticed that one component (a kind of resistor, given the shape) seems to have burned out along with another, possibly by touching each other. Here are the links to the two photos: https://drive.google.com/file/d/0B4V4V8vlH92LTHE4YmtMUVZRZXc/view?usp=sharing
    https://drive.google.com/file/d/0B4V4V8vlH92LTVZ4VVp0d09JalU/view?usp=sharing

    If you are still willing to give me your opinion, feel free!

    Best regards,
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  9. Sergio39 Posted messages 5315 Registration date   Status Contributor Last intervention   2 622
     
    Hello everyone
    I'm wondering what we see in the photo... it doesn't look like glue



    --
    Life is like riding a bicycle... you have to keep moving to avoid losing your balance... EINSTEIN.
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    1. mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   1 123
       
      yes, it’s glue that has heated and aged poorly
      see post 20
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  10. Ordralfabetix
     
    Hello everyone,

    Thank you again for your attention, here is a new series of photos accessible via this link: https://drive.google.com/drive/folders/0B4V4V8vlH92LOGdyS2tSMkVVSDg?usp=sharing

    The part I thought was burned does seem to be glue, as suggested earlier.

    Thank you all for your responses.
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    1. mushu14 Posted messages 11897 Registration date   Status Contributor Last intervention   1 123
       
      Hi there,
      I don't see anything that could have made a "clack pshhhh" on your power board...
      We still need to check the inverter board on the left side of the TV (normally) or it could be a blown neon.
      0