Question about JVC AV-32020 32" TV

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Buzzzing sound When i cut the tv on it makes a loud buzzing sound! I took the back off and it sounds like its coming from a little transformer looking thing!

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  • stebo12 Apr 26, 2008

    how do u do a continuity test?

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  • Master
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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.
Bill

Posted on Apr 26, 2008

  • William Rayburn
    William Rayburn Apr 27, 2008

    Using a dmm (digital multi-meter) or analog multi-meter set it for continuity. That meand when both probes are touching you get an infinity reading. Then touch each probe, one to the "E"lectrode and one to the "B"ase of the HOT and if it reads infinity BINGO bad Ic...

    Bill

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More sets than you might imagine have this kind of problem---I a regular TV it is usually a transformer that is vibrating hard enough to make the sound---the higher pitched sound is just that--a sound.

If this is a direct view(means not a flatscreen and has a Glass Picture tube it will be either the high voltage transformer or one of several smaller transformers.

This can usually be fixed---seen a few so loud the cats in the house run away.

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On chance it has the high voltage transformer I attach a photo of what that looks like.

5_23_2012_9_22_57_pm.jpg

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for example with back off and set on a plastic rod can be used to touch areas and exert slight pressure until the sound changes or goes away--then either replace the part or I have used hot glue etc to stop it.

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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:
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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.

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