Question about RCA Scenium HDLP61W151 61 in. HD-Ready Television

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Hi pitch squeel (Electricial Hi frequency noise), sounds like noise from a step up transformer or inductor. What can I do to stop this noise... It stops after about 1 or 2 hours after power on. but it is extremely loud on power up. Thanks

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  • rick6969 Apr 07, 2009

    I have a rca scenium 62in that squils. Not coming from the lamp unit. any idea?

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Check your power supply board for some bad caps (capacitors) on the board. They will look bulged on the top an may be a little leaky (brownish stain). A bad cap can sometimes produce a harmonic, causing issue's with the sound. Also look at the signal board (where all the inputs are), for bad caps. I have come across this on a lcd tv!! Good luck, hope this is helpful!

Posted on Mar 01, 2009

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Posted on Jan 02, 2017

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Is it a squeel or a hum / rumble? 1st run your hands around the tyres especially the inside. Check for hi and low spots on the tyres. If the tyre is hi low hi low hi low it makes a shocking sound. if it is a squeel noise have they checked your brakes cause brakes have squeelers to let you know they need changeing

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Hi I have a very annoying, ear piercing high frequency pitch coming from what seems to be the television. However, I was trouble shooting and based on the cable technicians thought; said to be the...


Hello
The LOT [Line Output Transformer] of your TV has damaged. It is the one, that supply all the voltaged needed to CRT. Its internal windings will get shorted in between, and is irreparable. Replacement is the only remedy to this proble. Replace the horizontal output transistor also with this. you haven't specified whether there is picture with your tV or not. If this high frequency sound is along with picture, there is some loose in the cores of the SMPS transformer, or LOT itsef. If there is no picture at all, and this high frequency sound is there, no doubt; LOT is damaged. OK.

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High pitch frequency noise coming from rear of TV and is very annoying to listen too. It is a constant noise and is more apparent when there is more black color on screen.


High pitch sound on LC-42D62 is reproduced by switching transformers on power supply board. To correct this problem, you will need to remove power supply unit from the TV, spray all transformers with SILICONE CONFORMAL COATING. Let it dry for 12Hrs. Then install power supply unit back.

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The high pitch sound is comming from a power supply transformer that will resonate (or vibrate) at the operating frequency (12-14KHz).
This is usually affordable to repair -at least worth the estimate.

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1 Answer

My tv makes a high pitch noise and is getting longer and more frequent, can you suggest a solution. thanks


The squeel you hear is created by a part wich is vibrating (resonating) at the horizontal Frequency - approx. 15KHz - To stop the noise you have to locate which part is vibrating and either replace it or isolate its vibration - The parts which commonly vibrate are theFlyback transformer or drive/pincussion transformer or the yoke. Each of these parts have hazardous voltage and High Voltage present so care should be taken when working around these areas.

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1 Answer

Hi pitch noise from the back near the top of L.c.d flat screen had to send two back and now have a sharps set which makes a noise now and again is it a normal issue


You could have a electricial short or a oscilating transformer ( a transformer that is viabrating ) that it is coming from the top could mean that is high voltage. Do you have a lot of dust in the house ? that attracks high voltage.

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1 Answer

Noisy transformer oon logik lcd tv model lcxw 32 hd1 power panel amo1 2004/02 version 1


Hi.

Providing the noise is not causing any picture or sound problems then the noise from the transformer is from the windings vibrating at A high frequency.

To prove this remove back from set & switch set on IF YOUR UNSURE OF YOUR COMPETANCE TO TOUCH LIVE CIRCUITS PLEASE TKE YOUR TV TO A REPAIR SHOP.

With an insulated item eg plastic pen or piece of wood push against transformer can you alter the pitch of the noise or make it stop alltogether by doing this.

If yes This can be cured by applying an epoxy resin type adhesive over the windings this will cure & pot the transformer which if done correctly will stop making the noise,

http://dysonmanuals.llc.nu/

Jul 26, 2008 | Televison & Video

1 Answer

Ringing


In the power supply and in the horizontal output areas there are some inductors (chokes) and some high frequency transformers. These are wound with enamel wires on a form which is mounted on a solid ferite core. The windings are normaly soaked in a special laquor and baked during the manufacture process to try to not have any loose windings or any loose mechanical fits.

When the transformer or inductor units are in the circuits, they are working with very high frequencies, and with very intense modulation or signal levels through them. It is possible that if there is any loseness in their assembly, they will start to ring or sing by going in to a mechanical resonation. This resonation is produced from their internal high frequency magnetic field. The frequencies are far beyond the fundemental human hearing range, but the sub-harmonics are not. The driving waveforms are mostly sawtooth or square waves in their properties. These allow for a substantial amount of complex harmonics through any resonant device that they can pass through.

It is possible to fix this, but it will take a lot of time. The first thing is to find the inductor that is resonating. The more complicated part is to see if it can be stopped from mechnaicaly resonating without damaging it, or causing problems with its performance.

Sometimes I have found a resonating inductor, and was able to fix the resonation by using a simple piece of thin plastic between its winding form and the iron core that it was wound on. I had others were I re-painted them with a high voltage rated laquor and then let it dry. I also had some that I was not able to get easy access to fix them for this. The only choice was to order a new transformer if the problem was to be fixed. And, there is no guarantee that it would be fixed if the new one had the same fault.

Jerry G.


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1 Answer

High frequency squeeling


Call tech support! That's why these people get paid. Sites like this wouldn't need to exist if they did their jobs correctly!

Mar 11, 2008 | Panasonic RR-830 Desktop Cassette...

1 Answer

High pitched squeaking sound


THIS PROBLEM IS CAUSED BY THE LINE LINEARITY COIL VIBRATING AT LINE FREQUENCY [15.625KHZ] WHICH IS AUDIABLE TO THE HUMAN EAR AS A SQUEEL . THE CURE IS TO DEPOSIT HOT GLUE AROUND ALL COILS SITUATED AROUND THE LINE OUTPUT TRANSFORMER

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