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Thank You Jerry G

That Toshiba (32AF43) with the high pitched whine after 5 -15 minutes of operation has dissipated. The TV was given to me, and it seems that moving it makes the loose winding or whatever worse. I am not a TV repair person nor an ET. A technician friend recommended applying some HV dope on the winding after finding the source. If the problem remains the way it is now, I'll just live with it; however, if it gets worse when the weather changes, I will take another look. I will be careful to discharge the tube and HV sources caps ... as I don't want to get shocked to kingdom come.
<>
Lastly, thanks for the advise. It seems right to me.

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I would not advise you to work on the TV yourself. Even discharging caps and the HV can be dangerous for you, and it can cause collateral damage if not done properly!

The winding sound can be from defective decoupling capacitors in the associated areas, and or the windings of the reactive devices are resonating, and or some metal shielding is resonating with the high frequency magnetic fields radiated by these devices.

This type of fault can come from the switching supply, or the the horizontal output stage. In these areas they are using high current and high voltage type transformers that are driven a ultrasonic range of frequencies. The resonance you are hearing is in the sub-harmonic range.

An experienced TV tech should be able to service this for you. When the electrical part is in spec and at no fault, the mechanical resonance can be difficult to fix.

Most of the cost will be for the labor to do the work.

Jerry G.

Posted on Apr 27, 2008

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I have a samsung neo 32 inch picture tube tv. When I turn it on there is no picture or sound, but there is a light high pitched noise.


That high pitched sound is likely the Horizontal Output section trying to work. It operates at 15,750 Hz or at the upper end of normal human ears.
It will sound like a high pitched whine.

This is a section or your television that you don't want to fool with unless you are quite familiar with servicing your set. There are very high voltages involved and only a qualified technician should tend to this defect. It maybe easy to fix or it may be quite involved. Get an estimate first then decide to go further or not. There is a potential fire hazard here so don't operate your set until this is resolved.

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The wining sound is most likely from one of the inductive reactive devices. These can be chokes or tansformers in the scan circuits or the power supply.

There are very high frequencies used in the ultra-sonic range for the switching power supply, and the transition times for the scan amplifiers and high voltage section are in the ultrasonic range. What you are hearing is something that is resonating with the magnetic fields generated by these high frequency devices, and they are making sub harmonic sounds in the audible range.

It is possible that in one of the reactive devices there are some wire turns that are a little loose, or the coil form is not very tight to the core of the device, or one of the near by metal shields is resonating from the magntic field.

There is also the possiblity that the supply voltage to one of the reactive devices is not being properly filtered by a by-pass capacitor and its structure is resonating between the normal power drive and summing with the unfiltered supply to it.

When the set is first turned on it is cold. As it operates its internal temperature will rise. There is expansion and contraction of the various parts. The reactive devices are made with very close tollerance, and their physical characteristics can change enough to allow resonance. If the fault is from a by-pass capacitor, the capacitor may have become thermo sensitive and change its characteristics with temperature.

In the case of a resonating reactive device, sometimes it is possible to fix the problem by re-inforcing the winding to the core if it is accessable. It is not always accessable to do this depending on its design. Then the solution is to change the part. If it is a shield that is resonating, this is usually easier to correct. As for any defective capacitors, these can be easily changed.

It would be best to have a very experienced TV service man look at the situation and spend the time to make a proper evaluation of what the fault actualy is.

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Flat panel displays have switching power supplies and are subjected to similiar types of resonation faults with their power supplies.


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