Question about Toshiba 23DL934G LED/DVD combi SurgeStrip E-Series - surge suppressor F

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High Pitched Noise from LED TV whilst in standby

I've just bought a brand new Toshiba flat screen LED TV/DVD combi. As soon as I plugged it into the power source, a high pitched noise started. After about 10 seconds the noise lowered in pitch, but this lower pitched noise continued in standby until the power is switched off. In my opinion the tv is faulty and I plan to return it. Can you offer me an insight into what the fault could be here? Thanks a lot.

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Posted on Jan 02, 2017

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SOURCE: High Pitched Noise

most high pitch noise comes from the anode conection on the picture tube thats connected to the flyback anode cap thats mean there is a high voltage leak,to stop the noise you can discharge the high voltage take off the cap and clean with alcohol.if the noise will have to put some red or clear silicone both the cap and tube stick together leave to dry for about 2 to 4 hrs.this will eliminate the leaking.good luck.

Posted on Jun 17, 2007

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SOURCE: Power light comes on, followed by a high pitched whine

Hi, If after trying the TV again later and problem persist, repairs are in order. A high pitched whine is an indication of a fault at the horizontal section of your TV. The horizontal provides the high voltage for the picture tube. Your best bet maybe to seek the services of a qualified professional TV repairman since this involves component level repair, soldering/desoldering, use of soldering iron and VOM (testers) and knowledge of circuitry. Good luck and kind regards.

Posted on Aug 20, 2007

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SOURCE: high-pitched whine

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.

I have had this type of problem often. I was always able to find the solution and fix it. Most of the cost of the service was from the time it took to work out the solution more so than the cost of the part, unless it was a major part such as the flyback or the deflection yoke.

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

Jerry G.

Posted on Apr 19, 2008

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SOURCE: Toshiba Regza bought 1/28/08 makes squealing noise

It's in the repair shop. I'll write back what the problem was and how much it cost to ship.

Posted on Oct 08, 2009

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SOURCE: Toshiba 40RV525U goes into green screen mode when

Try updating the firmware to version 1.05 from this website

Posted on Mar 26, 2010

Testimonial: "daubuchon..thanks for the info! That might have done the trick. The problem is much less prevalent now. Excellent!!"

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