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Speakers sold to me with my Dell system has power supply problem with transformer causing buzzing noise and I need to purchase a new power supply cord for my Altec Lansing ACS340 speakers

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  • melowe Apr 10, 2011

    Tried posting this to Dell and it came up here in Fix ya LOL
    I contacted Altec and they said those speakers are no longer made so I cannot get the power cord for them
    I think the only chance I got is to find and electronics expert and have hime put a new transformer in the old cord service I have. But I am even having a bit of a challenge with that here in Airdrie Alberta LOL

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You might want to contact Dell about a replacement if you just got those as they probably have a one-year warranty. If not, try contacting Altec Lansing directly (bottom of the page has contact options.

Posted on Apr 10, 2011

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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.


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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

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It ur Vizio tv,The power supply board is the problems.The transformers in the power supply board have gaps in the transformers.The high voltage curents flow that make that buzzing noise.

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Ur power supply board.Transformers have have high voltage gap.This problems must take the tv aparts put some glue arond the transformers,sometime solved this problems,or must replaced all the trnsformers make the humming noise.Brand new tv take it back,where u bought it get a replacement or call the Manufacture help to fix the problems or replaced the part that cause the problem.

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Sounds like an issue in your power supply. Try a good second hand supply or, if you have to purchase a new one, get a new case with a supply and install the guts of your PC into that as Dell power supplies are very expensive (if they are available at all for your model). Swapping everything into a new case is a pain I know but it may be a lot cheaper then a dell supply. You can also have your supply tested by a professional. Don't be tempted to open the supply and fix it your self.. Switchmode supplies are more then happy to provide all the power needed to turn you into a sticky mass on the floor!!! and the surge capacitors can hold a formidable charge for several hours which really stings when it bites you !!!

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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.

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A load buzzing sound comes out of the speakers. (Harmon/kardon). The transformer is very hot. Unplugged transformer. Unable to purchase a new transfor from E-Tech. They sent me the wrong part number. Plug...


Hi,
Frankly speaking JIM , its better inversting in the new speakers. But however if you can tell the model number for the speakers , lemme check if we can find a power adapter for you.


Thanks for using Fixya
proton

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Right, the problem is caused by the earthing of the power supply.

You need a box, which isolates the earth from the laptop to the television, known as an Isolation Transformer. This goes in between your laptop and television, and removes the cause of the hum.

The other option is entirely at your own risk, as you're dealing with mains electricity, however, cover the earth pin with some insulation tape, thus stopping the power supply from earthing. Keep a close eye on the condition of your power supply and cable, as you will not be protected against shock if a fault should develop.

The same problem exists with Acer Laptops, as I have one, and use an isolation box when I want to play music in venues from my Laptop.

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A couple of weeks after initial setup of my brand new Onkyo XT-SR606 receiver, I noticed a loud buzzing noise that starts up approximately 10 min after the receiver is turned on. The buzzing is definitely...


The "buzz" you hear is a power hum made by the power supply transformer. It's technically called "Lamination hum" caused by the revering of electrical current through the power supply transformer. In some cases the hum can vibrate the chassis causing other loose material to vibrate. If you can, go to your dealer and check to see if other units of this same type typically make a hum this loud, and if not, see if he can solve the problem for you.

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1 Answer

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The hum a fluorescent light makes is the 50 or 60 Hz hum of the alternating current mains supply. Inside the light fitting is a choke which when less than perfect tends to hum. When the choke is loose internally or externally is when the hum becomes an annoying buzz.

When an audio system has a similar tone of buzzing or humming the source will invariably be the same AC mains but how it got in there is difficult to answer...

It could possibly be poor smoothing and regulation of the power supply or an accidental hum loop caused by careless design and/or poor grounding. It could be caused by being induced in the input by connecting leads that are too long and poorly positioned/screened or it could be caused by mismatch between different components causing a poor signal-to-noise-ratio.

I am not sure why it should come and go but the fact it does would indicate a power supply problem more than the other possible causes.

If the Onkyo system has it's own volume control and it is being used witha tv or similar, it is worth trying to imporove things by turning up the tv volume to near maximum and then controlling the volume with the system control.

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