Question about Akai LCT3201TD 32 in. LCD Television

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Steady Hum in Audio

A Hum in Audio in all modes of operating. The hum was a 60 cycles in nature. Since the power supply is a switching supply and it does not operate at line frequency I felt that the hum must be introduced from the line voltage input. However I was going to check the power supply input. Before removed the power supply I noticed that the FOUR mounting screws that held the power supply to the main chassis were not tight. Tightening the mounting screws solved the HUM problem .If the power supply is not grounded fully a ground loop hum will appear. I felt this may become a problem as the sets age. From a retired electronic tech RAY AI4DU

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  • Louie  Role
    Louie Role May 11, 2010


    Appreciate much the sharing of info. TNX




3 Answers

This TV is well known for humming if you change vidio settings to any that require more power than default. Keep the vidio settings in the default positions.

Posted on Mar 09, 2008


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Again, thanks for sharing and posting at FIXYA.

Posted on Feb 12, 2008


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Good catch Ray. Thank you for the info.

Posted on Jan 31, 2008

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1 Answer

No power, some hum!!!! in side

Power supply is defective. The hum you hear is 60 cycles from an improperly filtered dc line.

Apr 05, 2015 | Audio Players & Recorders

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Bose radio bad hum

one of the most common sources of hum is a failing power supply.
I don't know your radio specifics..... however, some things to consider/try : if it can be battery powered, try it with batteries.
If hum disappears, then source is power supply. Power supply
hums are usually 60 or 120 Hertz (cycles per second). The most
common failure component in power supply, causing a hum, are
the filter capacitors. If you do try to replace these, be very careful
and discharge the old caps before you remove them - to avoid a
(potentially dangerous) shock... caps can retain a charge for many
days, sometimes. Another source of hum is if the radio is close to
a flourescent light, or other appliance which may radiate power. If so,
try moving radio. If the hum is high pitched, then more info is needed.
Hope this helps!

Jul 14, 2014 | Bose Audio Players & Recorders

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I have a pro Pyle PDWM5000 wireless microphone system. I had a slight hum before, but when I hooked it up lately. Now it hums so loud I have tried a lot of different things to correct the hum. No changes...

You are using a shielded cable to connect the receiver to your amplifier, right? If so then I would suspect the cheaply regulated AC to DC power supply (wall wart). Unfortunately the filtering cap value is usually to small and it causes a slight 60 cycles hum to show up in the audio output. I build supplies for critical equipment myself and install larger value filtering caps for cleaner audio.

Feb 17, 2013 | Audio Players & Recorders

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Nad 7140 fm low frequency hum

This is probably a 60 cycle hum and the problem is more likely confined to the am/fm board, there is a bad ground due to poor solder joints, broken ground wire, an open capacitor, this may not be easy to find, but it is a start.

Apr 22, 2012 | NAD 7140 Stereo Receiver With Phono Input

1 Answer

I have a Focusrite Pro 10 i/o Firewire Interface and am experiencing 60 Hz hum through the mic pres when phantom power is switched on with the power supply attached. Phantom power running from 6-pin...

I assume you are using condenser mics as you would NOT be using phantom power with any other type connected or other devices plugged in while you have phantom power. It is important to have ALL interconnected equipment, including the computer, powered from the SAME receptacle or power source. Make sure the power supply you are using is SPECIFICALLY for the unit from Focusrite as some supplies have filtering within the wall transformer module and others do not. The power supply MAY be generating magnetic fields... try moving it around and see if hum is affected. The capcitive coupling in a power supply can let in higher frequency components from lamp dimmers. Make sure you have no lamp dimmers anywhere near the equipment.

Apr 25, 2011 | Focusrite Saffire Pro 26I/O 26 In/26 Out...

1 Answer

Have a reel to reel tape recorder that has a bad Hum in playback mode. What could cause that?

Most hum is caused by a faulty electrolytic capacitors. If the hum is accross both channels, then it's most likely one in the power supply part. Maybe the big one that filters the 50/60hz mains hum. The reason you will hear it in playback, is that a switch will be opened up when the mechanism goes into play. This switch connects the tapes pre-amp to the audio out circuit.

Jul 10, 2010 | Audio Players & Recorders

1 Answer


When the speaker is connected only at the power line does it makes this noise?
  • If it does it's an internal amplifier's ploblem and you have to check out some fittings (electrolytic capacitorsat the power supply, power supply transformer, voltage stabilizers e.t.c.)
  • If the speaker is quiet you have to check your external wiring because there is a loop ground. That means that one "ground level" line is connected at the ground by two or more cables (e.g. the audio ground and the grond from the mains power source) In this case disconnect the second (and the 3rd e.t.c.) grounding point.
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May 10, 2010 | JBL EON 15-G2 Powered DJ Speaker With EQ...

1 Answer

When using the FM reciever, there is a

due to the nature of the f.m. signal you may notice a hum when locked into a signal especially during times of no modulation(talk/music),otherwise if its severe enough,look for ground loops and bad solder joints that let signals radiate through out the receiver and create humming,also check the power supply filter capacitors if its a 60 cycle line noise hum

Mar 19, 2010 | Audio Players & Recorders

1 Answer

60 cycle hum at the same constant level, even if you turn the volume up all the way, it does not get any louder. What might that be caused from? A bad ground solider joint maybe? The Balance (L&R)...

If the volume control does not effect the hum volume, then the hum is being introduced directly to the final amp section. Check for defective caps in the power supply for the amp section. This will be the nigher voltage supply usually 40V or more.


Nov 04, 2009 | Teac AG-370 Receiver

1 Answer


What type of noise is it making? If it sounds like a load hum, you may have a 60 cycle hum issue. This is caused by a capacitor not filtering out the 60 cycle ripple on the DC voltage supplied by the power supply. If you have this problem I would suggest measuring the power supply with a DC voltmeter first and writing this measurement down. Then I would suggest you plugging the amp into an isolation transformer and taking an oscilloscope (plugged into the wall)and measuring the DC voltage while the oscilloscope is set to AC if you see an AC ripple voltage higher then .1mv you have a bad filter capacitor or a bad voltage regulator.

Sep 08, 2007 | Peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2...

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