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Transformer is causing humming noise - Computers & Internet

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It is most likely the power supply fan that is making the noise.You should change it before it stops and gives you computer overheating proplems.Most computer stores have these fans and changing it is fairly easy. Let me know if you need further instructions.

Posted on Oct 16, 2010

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Posted on Jan 02, 2017

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Peavey XR 122D powered mixer developing hum noise dispite pressing the noise filter. anything more to be worth doing?


Hello,

I need a bit more information but from what i can tell it's about the power supply capacitors issue, as this devices are known to develop such kind of humming annoying noise when they go under the specified value, let me know further,
Regards.

Jul 20, 2014 | Peavey XR 1220 Powered Mixer Mixer Powered

1 Answer

Microwave buzzes when off


This is the power transformer humming, sometimes when transformers get older you get vibrations in the windings due to magnetic fields generated within the transformer which causes the humming noise, It's more annoying than anything and won't affect the operation of the microwave.

Mar 06, 2012 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

My rheem 90 plus, has a humming noise any time the power switch is turned on even with thermosat unplugged. i shut the switch off and it stops. do i have a short some where?


Hello, typically a humming noise comes from the transformer located in the blower section of the Furnace. Sometimes it is caused by the transformer being loose, and others it can be a sign of the transformer going bad. i would make sure that it is secure first and see if that helps.

Oct 28, 2011 | Heating & Cooling

1 Answer

Contant humming noise, even when not in use have to unplug in order to stop the sound.


The constant humming noise you hear when the microwave is plugged-in but not running is caused by the Low Voltage Transformer, which is located inside the back wall of the outer cabinet on the left side. If the microwave is working properly otherwise, there is no hazard, just the annoying noise.

To access the transformer, the microwave must be taken down and the outer cover removed. The transformer is held to the back wall of the cabinet with four screws, and there are two sets of leads with pull-apart connectors. The noise is the result of 60hz vibration being transmitted to the sheet metal from the transformer which may not have been sufficiently "potted" or otherwise mechanically isolated when manufactured. You can either replace the transformer or try wedging some thin rubber or other material between the transformer and the sheet metal to quiet the noise. Just be careful to not damage the windings!

Oct 31, 2010 | KitchenAid KHMS155LSS 1000 Watts Microwave...

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Why is there a humming noise coming from the right, front bottom corner of my microwave when not in use?


That is because the power transforme is located in that area and being a transformer uses iron laminations to transform the energy from the primary winding to the secondary winding/s using magnetism caused by the alternating currents. This in turn produces eddy currents that excite the iron and cause vibration to be set up, (the principle is similar in a loudspeaker). That is where the noise is coming from.
Tightening up the laminations may help but it is normal for a small amount of humming/buzzing noise dependent on the manufacturing process of the transformer.
I hope that explains it for you.

Oct 28, 2010 | Hotpoint RVM1435 Microwave Oven

1 Answer

Humming sound when Sony DVD player is turned on. The player is attached to a TV. The sound continues when a DVD movie is played.. The intensity of the humming changes with changes in the Video.


Is the humming just from the power on or is it when the DVD is spinning some media will spin with a loud humming noise something to do with the balance similar to an unbalanced car wheel, just a lot quiter. Burn the DVD using ImageBurn create an ISO and reburn.

If it hums without the DVD spinning it is probably the transformer on the PSU on it way out this can happen at any time it is caused by the voltage step down coil becoming damaged in some way and the lower voltage provided causes the noise.

If this is the case I suggest a new PSU or at least a new Transformer.

Jan 07, 2010 | Televison & Video

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Sub has started humming with amp turned off. just turned on at wall switch.nothing running


If the hum is from the back of the unit around the amplifier, it may be the transformer. It could be that the mounting is loose.
It could also be that the transformer is going out.

Disconnect all the inputs to the unit, Still hum?

If the hum stops you have something causing noise to the input.

If you have it on a switched circuit, try moving the power plug to a different outlet that is not on a switch. If hum stops, then you have something on that circuit causing the problem

if all inputs are disconnected and it still humms good chance it is the transformer.

Nov 12, 2009 | Velodyne CHT-8 Subwoofer

1 Answer

Humming sound comes and goes. you can turn off the vol. and you can still hear it. picture is fine.


More often than not humming and buzzing through your speakers is caused by a grounding problem. There are three main ground problems that cause problems in an audio / video system. These are ground loops, improper grounding and lack of a ground altogether. The other possible culprits that can cause noise are bad cables, a faulty piece of equipment or electrical noise from a lighting dimmer or electric motor. There are steps you can take to troubleshoot the noise and eliminate it from your theater or entertainment system.
The first step to is to find out where it is coming from. Disconnect your source and display equipment from your receiver or surround sound processor. If the noise stops, connect them back to the receiver or processor on at a time until the noise returns. When the hum comes back, you found where the noise is entering your system. Note that if you are connecting remote equipment, such as running the signal from your theater room DVD player to the TV in the bedroom, your chances to pick up noise increase dramatically. With such long runs, noise can be induced into the long cable runs from adjacent electrical wiring. It is also easy to create a ground loop, because the equipment is plugged into two different, widely separated outlets, on different electrical circuits.
If the noise is caused by a cable box, the noise is likely caused by the cable TV ground. To test this theory, disconnect the incoming cable TV feed to the rear of the cable box or TV while they are still connected to the rest of the system. If the noise is eliminated by disconnecting the TV cable , the problem is the cable TV ground. You can electrically decouple the cable TV feed from your system with a ground breaking transformer. These are available from many sources. Be advised that many newer, digital cable TV systems require any device in the signal chain to pass a full 1,000 Mhz. Some of the older ground break transformers will not do this. Be sure to check the specifications of whatever device you are purchasing to verify it will pass the digital cable TV signal.
If the noise is from your projector, TV, or monitor, it is most likely caused because the video display device is plugged into a different outlet than the other a/v equipment. It could be on a different circuit as well. These circuits may have two different ground potentials. That is, the resistance to ground is different on each circuit. A difference in resistance to ground from one ground point to another can cause the dreaded ground loop. If you get a ground loop, current flows between the two components. If the current flows through the components internal audio signal ground, you will get a hum.
You can use an isolation transformer, similar to the type used for cable TV ground problems, to eliminate the electrical connection from one component to the other. These transformers are inserted in line with the audio signal connection between the two components. If there is no audio connection between the components, the problem may be current flowing through the video portion. In this case, a video isolation transformer should be used to eliminate the ground loop.
Sometimes power conditioners will stop noise problems by placing equipment on different, electrically isolated outlets. This is done using isolation transformers. This can be ineffective however, due to the differences in internal construction of different power conditioning equipment. Some safety regulations, such as UL 1950, specify that an isolation transformer is only allowed to isolate the hot and neutral wires; the grounding wire must be passed straight through. If this is the case, the ground loop problem may still exist because many communication circuits are connected to the grounding conductor and not the neutral. In this case, the isolation transformer, or any power conditioner or UPS with an isolation transformer will have absolutely no affect on the grounding problem.
The noise may be generated externally, from a dimmer or refrigerator compressor for example, and coming in through the main power input on the audio video equipment . In this case, a high quality power conditioner may be effective in reducing or eliminating the noise problem. You may also find that one of the signal interconnecting cables in your system is faulty. This can also cause noise problems. Check for this by swapping the cables with one that you know to be good.
You can solve most noise problems in your home theater or multi room audio/video system by taking the systematic, step-by-step approach. Work your way up the signal chain, eliminating each piece of equipment as you go. If you have nothing connected to your speakers except the speaker wiring, and they still hum, the problem is noise induced into the speaker wiring from adjacent power cables. Other than that case, most problems are caused by ground problems, which you can find, and solve, if you take it one step at a time. Hope this helps. Let me know if I can help you with anything else.
JimmyC

Oct 04, 2009 | RCA TruFlat 27F520T 27" TV

1 Answer

Humming noise


I am fairly certain that your problem lies in the electrolytic capacitors. This is the most common problem in vintage radios, and causes them to make a humming noise that isn't affected by the volume control.

Dec 02, 2008 | RCA Victor Clock Radio

1 Answer

Syncmaster710N


There are no speakers attached but if for any reason humming is comming its the transformer inside the casing. Very comming in transformers that after some time they start humming noise.Its not for all of them but its some coiling fault but it doesn't effect anything.

Jul 24, 2008 | Samsung SyncMaster 740N 17" LCD Monitor

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