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Reply HI my tv is a segam htd501 dlp I don't know how old it is because we bought it second hand 2years ago, not sure if that helps sorry. Anne-marie.

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I recently came across this article and I really think that it will be helpful to you. I have had a few tv sets that have done the same thing as yours. I copied this article from and the full page link is High pitched whine or squeal from TV with no other symptomsFirst, make sure it is not coming from the loudspeaker itself. If it is,then we are looking at an unusual electronic interference problem ratherthan simply mechanical vibration.If it is a new set and think the sounds will drive you insane, returning itfor a refund or replacement may be best alternative. However, you may getused to it in time. I don't know about returning a set to a store thatdoesn't take refunds (I won't even ask about that!).
In most cases, this sound, while annoying, does not indicate an impendingfailure (at least not to the set - perhaps to your mental health) or signifyanything about the expected reliability of the set though this is not alwaysthe case. Intermittent or poor connections in the deflection or power supplysubsystems can also result in similar sounds. However, it is more likely thatsome part is just vibrating in response to a high frequency electric current.
There are several parts inside the TV that can potentially make this noise.These include the horizontal flyback transformer, deflection yoke, othertransformers, even ferrite beads in the horizontal deflection circuits. Inaddition, transformers or chokes in the switching power supply if this isdistinct from the horizontal deflection circuitry. Or even a portion of thesheetmetal used for shielding if in close proximity to a magnetic component.
You have several options before resorting to a 12 pound hammer:

  • As much as you would like to dunk the TV in sound deadening insulation, this should be avoided as it will interfere with with proper cooling. However, the interior of the entertainment center cabinet can be lined with a non-flammable sound absorbing material, perhaps acoustic ceiling tiles. Hopefully, not a lot of sound energy is coming from the front of the set.
  • Move the TV out of a corner if that is where it is located - the corner will focus sound energy into the room.
  • Anything soft like carpeting, drapes, etc. will do a good job of absorbing sound energy in this band. Here is your justification for purchasing those antique Persian rugs you always wanted :-).
If you are desperate and want to check the inside of the set:

  • Using appropriate safety precautions, you can try prodding the various suspect parts (flyback, deflection yoke, other transformers), even lowly ferrite beads, with an insulated tool such as a dry wooden stick. Listen through a cardboard tube to try to localizing the source. If the sounds changes, you know what part to go after.
  • Once you have located the guilty party, some careful repositioning, a strategically wedged wooden toothpick, or a dab of RTV silicone or hot-melt glue may keep it quiet. Where the yoke is the guilty party, see the section: Reducing/eliminating yoke noise.
  • It is possible to coat the flyback transformer, but this is used mostly when there a loose core or windings and you are getting not only the 15,735 Hz horizontal (NTSC) but also various subharmonics of this. This is probably acceptable but may increase the temperature of the flyback.
  • A replacement flyback (or whatever part) may cure the problem unless it is a design flaw or manufacturing quality problem. However, the replacement part could be noisier. You really do not want to replace the yoke (aside from the cost) as convergence and other service adjustments would need to be performed. Other transformers can be replaced.
Note that the deflection frequency - just over 15 kHz for NTSC and PAL - ison the border of audible for adults but will likely be loud to younger peoplepossibly to the point of being terribly annoying - or worse. If you areover 40 (men more so than women), you may not be able to hear the fundamentalat all (at least you can look forward to silence in the future!). So, evensending the TV back for repair may be hopeless if the technician cannothear what you are complaining about!
BTW, if you have a really old tube type TV, the power tubes (damper andhorizontal output) can also whine but these sets are few and far betweenthese days :-). Hope this helps...

Posted on Sep 10, 2008


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