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52 inch rca 52w20 powers up with three high pitched noises then nothing

My tv just would not power up one day, i took it apartĀ  found or so i thought i found where the noise was comming from replaced th ferrite transformer and still having the same problem any help?

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Splitter box in the front with 8 wire

Posted on Jan 21, 2008

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Free tv repair advice


The noise you hear must be from its back-light inverter board. The ferrite core in the inverter transformer may make a high whistling noise and will be annoying. Contact any technician. It can be stopped by gluing. But is a skilled work.

Apr 23, 2013 | LG 60PV450 60-Inch 1080p Plasma HDTV

2 Answers

I have a proscan 42LA45H 42 in television that has started making a buzzing noise from the back. What is causing this, and what do I need to do to fix.


Hi
If picture and sound is Ok, and only this buzzing sound is heard from the back of the TV, It should be due to core soose of some ferrite cored transformers inside, especially to the power supply regulator board of the TV. Open the back cover of the TV and swtich it ON. Listeen very carefully which transfromer makes the buzzing noise. Just trouch and press the core of the transformer suspected with some non-cunductive material like glass rod, or a stick of dry wood. You can identify the transformer that makes noise by this way. After identifying the exact transformer; switch OFF the set, unplug it from mains socket, apply some "Super Glue" like fast boanding glue to the joint of core of that transformer. Allow sometime for the glue to set. This will solve the buzzing sound problem of your TV. OK

Jul 13, 2011 | Proscan 42LA45H 42 in. LCD TV

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The tv is froze and makes squeaking noises, wth? Oh by the way it is a Westinghouse


First, make sure it is not coming from the loudspeaker itself. If it is, then we are looking at an unusual electronic interference problem rather than simply mechanical vibration.

In most cases, this sound, while annoying, does not indicate an impending failure (at least not to the set - perhaps to your mental health) or signify anything about the expected reliability of the set though this is not always the case. Intermittent or poor connections in the deflection or power supply subsystems can also result in similar sounds. However, it is more likely that some 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, other transformers, even ferrite beads in the horizontal deflection circuits. In addition, transformers or chokes in the switching power supply if this is distinct from the horizontal deflection circuitry. Or even a portion of the sheetmetal used for shielding if in close proximity to a magnetic component
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.
Hope this sheds a little light on the problem
You do not have other speakers right next to the tv??

NOTE: IF YOU DO NOT HAVE ANY ELECTRONIC EXPERIENCE THEN GET SOMEBODY WHO HAS EXPERIENCE WITH TVs TO DO THIS. THER IS 32000 VOLTS INSIDE THIS TV AND IS DANGEROUS WHEN THE BACK IS TAKEN OFF. THE RED CUP ON THE BACK OF THE TELEVISION TUBE WITH RED WIRE ATTACHED HOLDS THIS CHARGE - KEEP KEEP AWAY FROM THIS

Feb 01, 2011 | Televison & Video

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My Sanyo is making a noise that's been a little quite but now its louder and it would usually go away but its not. Please help I don't want to use the small tv


One anong your TVs transformers causing the problem. Usualy, on all tvs ferrite cored transformers are used. If the core of the transformer get loosed, it will make a whisling noise. To get the faulty transformer, you must open the back cover of the tv and listen which transformer makes noise. Usually core of LOT will vibrate. After recognising the transformer which makes noise, press its core with a wooden or plastic matereial to sure the transformer under concern is it or not. Fix its core joints with some super glue, without seperating it you can do that. Take caution. There are severel very high voltage points are ther inside the tv.

Oct 13, 2010 | Sanyo HT32744 32" TV

2 Answers

Monitor has a medium pitch irritating hum. What gives?


All lcd monitors have transformers in them converting voltages. Most all transformers make a humming sound, some are more noticeable than others.
This link here has a good explanation for it
http://www.psaudio.com/ps/knowledge/why-do-transformers-hum

Technically there is not much you can do about it apart from adjusting screen brightness (which may or may not reduce the hum), or finding a higher quality replacement.

Mar 16, 2010 | Envision 19" Widescreen Flat Panel TFT LCD...

2 Answers

Jvc 26 inch lcd tv won't turn on


You can try troubleshooting the power supply board. The only thing is it takes a little knowledge in electronics. The power suplly turns the 120VAC into DC. Then filter it and use it to power a Transistor. The transistor switches at a high frequency sometimes up to 200,000 cycle per second, and that drives a ferrite core transformer that distribute power to all the cicuit board inside your TV. You really have to be familiar with electronic components n how they work. If you don't already know electronic my suggestion is checking out electronic books in the local library first. Good luck.

Mar 05, 2010 | JVC LT-42X579 42 in. LCD TV

1 Answer

Hi, I have a Magnavox 17MD255V/17 combo dvd-tv. Everything works fine except that the AC adaptor has a high-pitched whistle that continues while the tv is on. I tried unplugging from the the tv itself and...


TAKE THE AC ADAPTER APART. LOOK AT WHERE THE MANUFACTURER PUT HIS GLUE AND REDO IT CLEAR NIAL POLISH WORKS BETTER IT FLOWS UNDER THE PARTS BETTER. YOU CAN PLUG IT ALL IN WHEN ITS APART BUT MAKE SURE NOTHING CAN SHORT OUT. THIS WAY YOU CAN PINPOINT WHERE THE NOISE IS COMING FROM. OTHERWISE GLUE THE TRANSFORMER AND ANY SMALL FERRITE BEADS THESE SWITCHED MODE POWER SUPPLIES OPERATE AT HIGH FREQUENCIES AND LOOS PARTS CAN VIBRATE CAUSING THIS NOISE.

Dec 27, 2009 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

1 Answer

When the door is closed it makes a buzzing noise, the micro still works and the noise goes away when turned on and used


> the noise goes away when turned on and used
Is it possible that the other noise produced when using the oven are only covering up the buzz?
I think your microwave has two power supplies; one that supplies the low voltages for the display and control, the other for the magnetron. The first supply may be a standard line frequency unit using an iron-core transformer and if these are cheaply made, the laminations can vibrate and cause a 'buzz.' Better transformers are 'potted' so that the laminations are glued together with epoxy and can't vibrate. On later units, the magnetron voltage is produced by a 'switched mode' power supply that uses solid ferrite instead of iron and never vibrate.
If it was my unit, I would take it far enough apart to run a couple of beads of epoxy glue across the laminated transformer to kill the resonance.

Nov 15, 2009 | GE Profile Spacemaker 1.8 Cu. Ft....

1 Answer

52 inch rca 52w20 powers up with three high pitched noises then nothing


sounds like the flyback which is the number one component that fails on that model. You need flyback 259296 and you can get a replacement flyback at the following with step by step instructions on how to replace it. heres the link.
http://servicemanuals.vstore.ca/

Sep 02, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

My 1200 is making a loud buzzing noise!


Yes, that large metal box is the housing for the transformer. Not too hard to replace, but if not done properly can cause serious damage to your turntable.

I've never heard of a transformer on these units causing a buzzing noise. Did you buy this used or new? If it's new, it's highly unlikely that the issue is with the transformer. However, we have been seeing some 'unusual' issues with Technics 1200s lately, which we attribute to a decline in quality standards @ Matsushita (Technics parent company).

The transformer can be purchased HERE. There really isn't much to replacing this part, just put it back exactly as you took it apart. Take pictures along the way, to help you if you get stuck. Also take some notes on where each part goes.

If you get stuck along the way, feel free to give us a call. Our service techs are masters with the 1200s, and we can walk you through it: 1.866.668.1596 ext 1

- DJ PRO LAB
www.DJPROLAB.com

Apr 22, 2008 | Technics SL-1200MK2 Turntable

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