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High pitched squeal from transformer/coils in the center of the pcb

Unit wont turn on. There is either a high pitched squeal from the area around the a transformer (wound coils) in the center of the pcb, or when the power cable is pulled from the output, it makes a low pitched chirping noise. Their is no 12V, no 5V, the 5USB is 6.8V, the 3.3V is 3.5V and the STB is -.8V : all without load on the output.

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Posted on Jan 02, 2017

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SOURCE: iLO DVDR05 makes high pitched squeal during recording

Usually a problem like this has to do with d.c. power sypply problems. Because "record" uses a different supply voltage and maybe "subcirckit" [not the same dc voltage that you use for playback, etc] If you know HOW to look inside and if you know how to take voltage\current readings...check ALL capitors,the diodes(misspelled?)Replace any that are "swolened", they are bad Other then that, take it to tech who if he is a crock he will overcharge, and if he is honest will repair for a fair price..... " Rotosa Ruck " [lots of luck]

Posted on Aug 20, 2007


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I have a Toshiba 27AF42 and I get a high pitched squeal after the TV has been on for a few minutes. Any ideas how to fix this? Once I turn the TV and back on again the squeal goes away.

yes. its the horizontal linearity coil resonating. take off back. and while unit is on, take a plastic straw and push on coils in the high voltage area. you will find one that squeals when pushed on, or will stop squealing when pushed on. solder that coil and area. that will fix 80 percent of the time. if you push on it and the squeal tone changes, solder it and silicone it done. fixed.

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RCA HD52W59 makes a high pitch internal squeal sound

coil LL0037 resolder then with a glue gun glue top of coil and down.OR replace coil.

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Squealing sound means you have something shorted in high voltage area around FBT on Power/deflection board.UED has replacement boards & Misc Parts for these sets if in stock call them1- 800-648-6657

Dec 20, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

"High Pitch Squealing" from my tv.

this most likely a coil or transformer that is doing this
And yes this is worth fixing , shouldn't be to bad on the cost of the repair

Dec 01, 2008 | Sony Televison & Video

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RCA Model f27650 High pitch squeal

the high pitch squeal indicates shorted component/s. the transformer goes hot co'z its being overloaded by the shorted component, it too could be the one creating the squeal!!

if you have experience with electronic troubleshooting, try to test some of the components particularly on the secondary part of the transformer.
Be careful and make sure the TV set is unplugged.
test for shorted diodes and transistors, if you're in doubt of your readings try to desoldering one leg of the diode then proceed with the testing/measuring. replace any of the bad components you find exactly with same part number or replacements with the same rating.

spend more time on it resoldering some other cold soldered components.

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2 Answers

High pitch

I have never heard a tube make noise when there is a good picture. Anyway, the noise has to be a transformer ringing or oscilating. They make a high pitched squeal when they have a loose winding or their cover is loose. You probably won't be able to feel or see anything loose on these transformers The power supply switching transformer is the first to look at. Take a hot glue gun and just cover the thing...especially at the base of it. The next (and only other) one is the horizontal drive transformer.It is located close to the high voltage transformer( biggest thing on board and usually in back or corner of the PCB.This one wont squeal) The horizontal drive transformer is about the size of a large marble and is encased in a black plastic cover. Cover it with hot glue also.
If you take the back off you will probably be able to localize where the squeal is coming from. You will probably need a signal to hear the noise also. After you find where it is coming from UNPLUG the set before doing any hot gluing!!!!
If you 're not up to this procedure take it to a technician. Your tube is not going bad and the set is definitly worth repair. Simple fix!! Good Luck!!


Oct 03, 2008 | Sharp 32SC26B 32" TV

1 Answer

A high pitched tone is constant when the TV is on

The problem could be that of coil that has become loose and is vibrarating cause your squeal . Or it may be a transformer in the power supply that is also vibrating . These can only be replaced to get rid of your problem and you have to isolate which one is causing the noise . Good luck

Mar 11, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

High pitched squeal

What an RCA I hope you didn't pay mutch for this, NO it's not the part of the board were the cable goes in, the so call squeal is the horizontal oscilation of the coil you hear, narmaly it is at the rate of 15747 hz, to find your problem you most open the back cover, and while the ptv is on try to hear by insolating the noise were it is comming from with a credit car or something that will hide the section you trying to find, it will be a transformer or a coil, close to the power supply or the horizontal defflection section. To fix your problem well that's all a different game, you must contact me via e mail at

I hope this help.
Meanwhile keep on smilling, life to short

What about Bob
Timmins, Ontario

Feb 24, 2008 | RCA P46921 46" Rear Projection Television

2 Answers

Won't Turn on anymore.

The high pitched squeal you refer to comes from a faulty component called a capacitor ... these store power in a circuit to compensate for AC or alternating current, thus allowing an appliance to operate continuously.

The component itself is relatively inexpensive, and would take around 20-40 minutes to isolate and replace, hence it would be relatively cheap to fix.

Having a repairman take a look and explaining the noise as above, would help narrow down the complaint.

The display is faint because of the lack of constant power getting to the display.

Jan 12, 2008 | Cyberhome DVR 1600 DVD Recorder

1 Answer

High pitch sound for Sony FD Trinitron WEGA KV-27HS420 27" TV

The high pitch squeal you hear is usually caused by a coil vibrating, normally in the horizontal circuit. I've also seen the ferrite bead on the horizontal output transistor do this, but, it is rare. I normally will repair this by finding the coil and "tightening" it. To tighten a coil, technicians use different chemicals, such as, a hot glue gun, rubber silicone or even finger nail polish. I will find the coil that screams by starting with the usual suspects and using a wooden dowel, barely touch the coil and if the pitch of the noise changes, then, thats the coil that needs repaired. If you do not know your way around the inside of a television, I never recommend you do so, since, this procedure must be done with the set turned on and you poke your hands around the inside of the set by the high voltage circuit. Hope this helps your decision.

Mar 04, 2007 | Sony FD Trinitron WEGA KV-27HS420 27" TV

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