Question about RCA D52W20 52" Rear Projection HDTV-Ready Television

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Works except for humming sound on audio

Worked fine until sudden developement of a humming sound on audio. Unplugged all connections to rule out feedback loop. Still humming. Is there a seperate sound board?

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Anonymous

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I have the same problem> Only lasts for a few minutes, but, it hurts a little and its an incredible annoyance. Besides being annoying I'm afraid the tv is dying soon and the noise its its high pitched scream of pain agony as it slowly finds its way to its final resing place.t

Posted on Nov 07, 2008

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Sounds like you may have a bad transformer

Posted on Aug 18, 2008

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Have Simmons SD9K drum kit. Started having a hum. Tried thru head phone or Mackie board. It still hums. Pulled each cable to drums or cymbals and it still hums. Anyone know what is causing this.


The hum is likely to be the sound of the ac mains electricity, either because the power supply smoothing has become ineffective in the amplifier or one or more of the audio peripherals or because the audio connections to the input of the amplifier have created a hum loop that is picking up the radiated energy from the mains supply and feeding it into the audio input.

Multiple grounding is often the reason for a hum loop. This is where an audio peripheral is not only grounded through the supply cable but is also grounded through the screened audio lead.

If the hum persists when there is no inputs connected the problem is almost certainly power supply related, otherwise it is likely to be a peripheral that has a faulty power supply or the culprit is a hum loop.

Hi-fi officianados have a number of tricks to deal with hum loops and google could lead you to these.

Grounding is an important safety consideration so appliances that are intended to be grounded must continue to be grounded but the loop could be broken by using special audio leads. The usual lead would use the screening as a conductor and so the screen must be connected both to the peripheral and to the amplifier.
A better lead uses an extra core conductor and the screen then becomes just a screen and is grounded only at the amplifier end and is not connected to the peripheral.

I hope this helps.

Sep 10, 2016 | Simmons SD9K Electronic Drum Set

1 Answer

Have an older (6 + Yrs) VX-10A model, that's worked fine up until now. I recently moved, hooked up the same stereo and surround sound speakers, which worked fine, but the subwoofer made a loud hum as...


Disconnect the input and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

Mar 03, 2011 | Velodyne VX-10 Subwoofer

1 Answer

After a power outage I have a loud hum.


Hi, The Ground Rules Of all the annoyances that can afflict any audio/video home theater or even a simple stereo installation, the notorious "ground loop" may well be the most difficult and persistent one to track down and eliminate. A "ground loop" is caused by the difference in electrical potential at different grounding points in an audio/video system. (All the grounds in an A/V system should ideally be at "0" potential.) A ground loop typically adds a loud low-frequency hum or buzz as soon as you plug in any of various audio or video components, including subwoofers, cable-TV outboard boxes, satellite-TV feeds, TV displays, amplifiers, A/V receivers or turntables. The buzz/hum is a byproduct of the multiple power supply cables and a ground voltage differential within your system and its network of interconnecting cables.

Here are some methods to help you get rid of ground loops. Try these first and don't waste money on a power "conditioner" which, in most cases, won't help. (There is no need to "condition" the AC power for your system. Your receiver or amplifier already has a power supply with its own filters and transformers. No further filtering is normally required.)

If you get your system up and running and hear an audible buzz or hum, the first culprit to look at is either the powered subwoofer or your cable-TV or satellite-box feed at the entry point to your system.

First, the subwoofer: unplug the coaxial cable that connects to your powered subwoofer to see if the ground-loop hum disappears. If it does, it's likely coming in through your cable/satellite TV feed.

Reconnect your subwoofer's coaxial cable from the subwoofer input to your receiver's subwoofer output and disconnect the cable-TV feed (or satellite feed) from your outboard set-top cable box or satellite tuner. Be sure and disconnect the cable before any splitters. Now see if the hum/buzz from your subwoofer stops.

If that eliminates the hum, you can install one of these inexpensive in-line ground isolators from Parts Express or Bass Home. Note that these transformer-based ground isolators will work fine with analog cable-TV feeds, but depending on their design they may interfere with or block reception of HDTV signals via a digital cable or satellite dish feed.

Install the ground isolator between the cable-TV feed and the input of your outboard cable-TV box or satellite tuner (or the TV display's antenna or cable input if you have a set with a built-in TV tuner or a cable-card ready set). In many cases, the ground isolator will "break" the loop and remove the annoying hum or buzz by isolating the TV-cable ground.

If a hum remains with the TV cable completely disconnected from your system, or you don't want to risk degrading reception of HD signals from a cable or satellite system, then you may have to add a ground isolator like this Radio Shack Model 270-054 between the line-level coaxial subwoofer cable from your A/V receiver and the line-level input jack on your powered subwoofer.

In all cases, if your subwoofer has a ground-lift screw like some of Axiom's subwoofers, try first removing the screw (or replacing it) to see if it increases or eliminates the hum. It may or may not make a difference.

If you do not have easy access to the aforementioned ground isolators, here are a few more tips:

Try plugging the subwoofer into a different AC outlet in the room, one that isn't supplying power to your components (A/V receiver, TV, cable box, etc.). That might fix it.

Try reversing the AC plug for your A/V receiver or the powered subwoofer. If it's a 3-wire plug or a polarized plug, which has one prong wider than the other, you won't be able to reverse the plug. For safety, do not use a "cheater plug" to bypass the 3-wire plug.

With the power OFF, reverse the AC plugs one by one of any other components that have a standard 2-prong AC plug that isn't polarized. Each time you reverse a plug, turn on the system with the attached component and your subwoofer and see if the hum disappears. In some cases, reversing one or more plugs will eliminate the hum.

If you have a turntable, try connecting a separate ground wire to a chassis screw on your preamp or receiver and see if the hum disappears. If you already have a turntable ground wire, try removing it from the preamp. One or the other may eliminate the hum.

Finally, here is another solution that worked well for a member of our message boards who decided to discard his ground-loop isolator on his subwoofer: "I took off the ground-loop isolator I'd been using and connected a plain 14-gauge wire to chassis screws on the sub and the receiver then powered everything on. Although hum was still there, it was far lower than before. Next I unscrewed the ground-loop screw on the back of the sub and that took care of the hum completely."

Almost certainly sounds like an earth loop to me, but can be caused by a poorly made transformer or phase shifts on the mains supply. Visit some power conditioner web-sites like Isotek or Isol-8 (or google "earth loop") where there's plenty of advice on how to reduce/eliminate earth loops and other causes of mains-induced hum (transformer problems etc).

Hum on the speakers usually indicates that there is a DC voltage on the speaker line. DC voltage on the output lines would be caused by a shorted output transistor.


Have a nice day...

Feb 16, 2011 | Cambridge Soundworks BassCube 12 Speaker

1 Answer

I have the all tube Crate TV-120. When I turn it on it fires up fine. When I switch the standby on I get a loud whistle sound and can hear a humming from the speakers. I can also get a low guitar volume...


This is a guess: I suspect the bypass switch on that effects loop jack is causing a problem. These jacks cause a lot of problems. The switch passes the signal through if there is no plug for an effects in the jack.

You can SOMETIMES tighten up the contact to restore the jack. You have to disassemble teh unit to get at it of course.

Jan 23, 2010 | Crate SPA1600 Power Amplifier - SPA Series...

2 Answers

Humming sound in subwoofer after it's been playing for a while


It sounds like you are describing an earth loop problem. I won't go into detail in this post, but try an isolation test first. disconnect everything from the reciever except the sub and try connecting say a BATTERY powered mp3 player or cd player to minimise connections to the electrical mains earth. you could also isolate things by taking your sub to a friend's house and trying it on their system.
If it is an earth loop use a process of elimination to find out which two pieces of equipment causes the earth loop. then apply filtering.
you can buy earth loop isolation transformers for about AU$26 and I've used one on my sub myself. Theyhave RCA (phono)plugs on each end and they connect inline with the signal cable to the sub amp.

as for the thumping sound it might be the speaker protection circuitry cutting off the amp to protect the subwoofer speaker from damaged. This might be triggered if the earth loop sound is causing the sub amp to overload and clip.

Failing this there might be a dried out overheated electro capacitor in the amp circuit causing the hum. Hav a chat to your local electronics person, who should be able to spot it!
Hope this puts you on the right track
Happy Hunting!

Jan 07, 2010 | Sunfire Audio Players & Recorders

1 Answer

Sound doesn't work on Toshiba 36"


Unplugged the TV for 5 minutes and the audio is working now . . . what a pain to have to do this with how complicated theater systems are today!

Sep 02, 2009 | Toshiba REGZA 42WLG66 42 in. HD-Ready LCD...

1 Answer

321System No sound just humming with TV connected to Video1 or 2


Hi...
Get new audio cables . It seems there's a broken Ground (shield ) wire somewhere in the cable. NO ground means HUM usually

Dec 30, 2008 | Bose (321GS) System

1 Answer

Humming sound in receiver...being transmitted to ceiling spaekers


Low humming sound is invariably the ripple of the AC mains supply breaking through.
Sometimes it is radiated from nearby wiring, sometimes it is caused by a hum loop and sometimes it is an indication the capacitors in the power supply are failing.

Feb 27, 2018 | Denon AVR-484 5.1 Channels Receiver

5 Answers

No sound on hitachi 53sdx01b


The first thing to try is rescanning the Freeview channels as it may just be a software corruption...if you have the option of "1st time installation" pick that.Also let me know if there is any buzzing sound coming from the tv..

Oct 16, 2007 | Hitachi 53SDX01B 53" Rear Projection...

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