Question about Projection Televisions
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 www.repairfaq.org and the full page link is http://www.repairfaq.org/samnew/tvfa/tvwhine.htm.
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:
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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