Hissing Sound In TV

By on June 28, 2013

At the starting my TV produced heave hissing and wiring noise. After few minutes it will disappear. But picture and sound are clear.

Answer:

Hissing sound usually are caused by transformer, inductor/coil due to loose lamination of the core.  An overheated transformer also could cause hissing sound. This is why you need to know if the transformer runs hot or not. If it is very hot and too hot to be touched then suspect  a bad transformer otherwise suspect a loose lamination of the core. Some repair techs called hissing sound as noise or even high pitch sound.

If you came across an equipment that work normally except for the hissing sound, the first thing you do is to gently hit the transformer or even the coil with the handle of the screw driver. If there is no changes probably either the transformer itself is bad or the corresponding component have problem. If the transformer is quite down after you hit it this means there is loose lamination of the core.

What you can do in this case is to dip the transformer into shellac for about an hour and then let it dry for a day. The hissing sound will usually go off.  I had done that few times and each time it worked.

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17 Comments

  1. shehab kably

    July 1, 2013 at 1:55 pm

    Where from i can order shellac please?

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    • Jestine Yong

      July 1, 2013 at 9:17 pm

      HI Shehab,

      You can order it from any hardware shop. It is use on wood (furniture) to make it shine.

      Jestine

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  2. Gavin

    November 11, 2015 at 6:46 am

    hi Justine my 72 cm crt telefunken tv has has no picture, no sound, a bleanking red standby light and a clicking sound from inside the set. Pls help. Thank you.

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    • Jestine Yong

      November 11, 2015 at 10:25 am

      HI Gavin,

      Have you checked if the output voltages from the power supply good and stable? Did the CPU IC receive a steady 5 volt supply? Have you checked if there is any bulged e-caps in the power supply section?

      Jestine

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  3. RKT

    February 4, 2016 at 6:10 pm

    dear sir,

    my Philips 24PT244 TV giving whistling sound no audio/video, I asked the eng he told that yorkcoil goes bad, cn u pls suggest.

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    • Jestine Yong

      February 5, 2016 at 11:37 am

      Hi Rkt,

      If the Yoke coil is shorted then the power supply sometimes can produce hissing sound. Before that make sure the B+ supply is good. If it decreased then suspect flyback, HOT or even the yoke coil.

      Jestine

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  4. xvr

    April 30, 2016 at 9:04 pm

    I have a problem with hissing transformer in a LED TV. The sound becomes quieter if I push the board gently but hitting the transformer has no effect.

    Do you recommend to desolder it and then soak in shellac and solder it back?

    What do you mean by "loose lamination of the core"?

    If shellac fails where can I buy transformers? Capacitors are everywhere, but I haven't seen anyone selling trasformers yet.

    Thanks!

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    • Jestine Yong

      May 2, 2016 at 12:06 pm

      Hi Xvr,

      I suggest that you make sure the screws really tighten to the ground in the power supply board. If no dry joints and the hissing sound is till there then you may need to soak it into shellac. Loose lamination meaning the winding in the transformer has become loosen causing vibration. You can read the below link why transformer hum:

      http://www.mgmtransformer.com/faqs/why-do-transformers-hum/

      It is hard to buy smps transformer alone because they are uniquely designed. This means if you can't find the transformer, you have to buy the whole board.

      Jestine

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  5. janyves

    July 24, 2016 at 6:01 pm

    Recently I changed the power board for my sharp 21h-sc . It worked for like a minute and went off. When I push the power button I hear hisses around the power PCB and the i.r sensor blinks before it powers off. I left it overnight and in the morning it came on normally. What do you think is causing this ?
    The power PCB is an external one. I incorporated it with the TV when the power side refused to respond to repairs.

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    • janyves

      July 24, 2016 at 6:06 pm

      The I.r sensor blinks after I switch the TV off. It hisses with no audio and video

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    • Jestine Yong

      July 28, 2016 at 5:59 pm

      Hi Janyves,

      Do you mean now the TV can be turned on normally?

      Jestine

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  6. Robert

    February 14, 2017 at 4:17 pm

    Hi Jestine
    Its Robert from namibia im also having a problem with a samsung ua40eh5000 no power it did take long to come on after several attempts now its just a hissing sound.

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    • Jestine Yong

      February 15, 2017 at 8:40 pm

      Hi Robert,
      May I know what have you checked?

      Jestine

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  7. Achieve

    October 20, 2017 at 2:28 pm

    My Videocon tv is not turning on but the red light flashes only once and some hissing sound is coming from back but tv is not turning on.
    Please tell as to what should I do.
    Thanks

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    • Jestine Yong

      October 23, 2017 at 12:36 pm

      Hi Achieve,

      What type of TV was that and what have you checked? Have you checked if all the output voltages good?

      Jestine

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  8. Jack

    November 7, 2017 at 2:40 pm

    I have a problem here, my crt tv just turn on few second then turning off it self and leave it to stand by mode. I trying to turning on with the remote nothing happen it wont turn on or anything, what i should do?

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    • Jestine Yong

      November 8, 2017 at 8:58 pm

      Hi Jack,

      I suggest that you check the power supply first and make sure it produce all the required output voltages.

      Jestine

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