Question about Standard (CRT) Televisions

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Buzzing/Fizzing noise at the back of TV.

I have owned the jvc av-28r4sk for almost 3 years. There is a buzzing/fizzing sound coming from the back of the TV. It increases and decreases as the picture colour changes or as the picture transfers from scene to scene.Even with the sound at mute I can still hear the noise coming from the back of the TV. Can anyone help?

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  • sodafarl Jan 31, 2008

    Thanks. I have already had an engineer look at this, but could not offer a sloution. Should he not have spotted this fault after testing it for a few days. If this is the problem how much is it likely to cost to fix.

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  • Master
  • 4,402 Answers

Sounds like arcing from the high voltage transformer. i don't not recommend using it until you have it looked at.

Posted on Jan 30, 2008

  • Cary Farah
    Cary Farah Jan 31, 2008

    flyback and labor looking at about 200

  • Cary Farah
    Cary Farah Jan 31, 2008

    please mark the post solution as fixya

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Tv started making a fizzing noise and now it is clicking as well with a slight movement of the screen during the click noises, goes up and down in volume now for a few days


is the fizzing noise when the screen is really bright? if so the scan coils on the tube have come loose and need glueing down with nail varnish i know it sounds strange but it really works

if the fizzing is coming from the tv then you have whats called dry joints

dry-joint_small.jpg
and this will need to be resoldered or the tv will shut down if you can do this yourself then the best way to find them is to remove the back and turn the tv on its side turn on the tv and turn off the light you will be able to see the dry joints sparking on the baord


hope this helps


John

Jul 06, 2011 | JVC AV32F476 32" TV

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sounds like bad audio pcb if buzz comes thru
the speakers,

Aug 19, 2009 | Standard (CRT) Televisions

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Humming sounds come from the power supply and buzzing sounds come from other circuitry. Most likely a capacitor somewhere.

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Quasar 1989 tv makes a buzzing motor sound


Hi and welcome to FixYa,

Initially, if you have confirmed that the source of the buzzing sound is from inside the TV, then that would indicate a component about to fail or would need attention. Let us try process of elimination:
  • tuner - most unlikely, the tuner is responsible for selecting the channel. No component/part of the tuner could make such a mechanical buzzing sound;
  • speaker(s) - most unlikely, the speaker could have a buzz but generally would not affect the video nor cause snow (weak TV signals);
  • transformer - a strong possibility although without knowing the exact model, at most generic ideas; power transformer, flyback transformer, horizontal drive transformer (unlikely);
  • arcing - another strong possibility. This could be caused by damp, dusty surroundings of the components especially at the FBT area. Another area that could have adverse effect when dusty/damp would be the anode cap.
This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

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That's called your secondary and it a feedback you're hearing probably because the HOT is shorted... Unplg the unit and do a continuity test on the horizontal output transistor - in particular E to B and if you get infinity that's your trouble.
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1 Answer

Buzzing sound


You haven't specified where the buzzing sound is coming from, if it is coming from speakers, changing capacitors in the audio section will fix the problem, especially the filters. Now if it sounds like a hissing sound from back of the tv, the CRT base socket is the culprit. It is an easy thing to fix, and the base is cheap, but make sure you purchase the exact same type of base or it will harm the CRT. Good luck.

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My 3 yr old Samsung DLP has the same buzzing noise, had a tech out today and he said "color wheel". Thank goodness I purchased that expensive warranty, This is my 4th repair in 3 years.

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yes you have defective horizontal output! that is from the power section near at the flyback!

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Check filtr capacitor in power unit.
Check filter capacitor on supply to audio amp ic. or Amp ic itself is defective.
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Andy, I'm thinking the buzz is from the deflection coil (yoke) on the neck of the tube or the power supply. Probably not the high voltage as you can hear the "buzz". If it's really that annoying, you can take a length of rubber tubing (no metal) and listen to the buzz coming from the chassis kind of like a stethoscope. STAY AWAY FROM THE HIGH VOLTAGE, please. The yellow picture sounds like a blue chroma failure. A tube can be rejuvinated if need be but that's a job for a pro. Hope this helps.

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