Question about Akai CFTD2011 20 in. EDTV-Ready LCD Television

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Hum when off

When you turn the tv off it humms from the back of the tv

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Re: hum when off - Akai CFTD2011 20 in. EDTV-Ready LCD Television Flat Panel Televisions

Call 800-726-4405 - Akai Customer service

Posted on Mar 29, 2008

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1 Answer

My tv humm

Usually Hum in audio can occur due to the main power supply regulator board to the TV or damaged / shorted component/s at its audio output stage circuit. Your TV need a through check up to locate the exact problem. Contact any service technician.

Dec 22, 2014 | Coby 40 TFTV4028 LCD TV

1 Answer

Our Polaroid flat screen TV humms when it turns on, and now, we have no picture, just a blue screen, and the hum and the hum goes away, but no picture? what's with that?? We got this as a gift, it was...

You may have 24vdc power supply failed or the backlight inverter board may have shorted out, need to do in-depth troubleshooting to narrow down the problems, proper tools and knowledge will be needed.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:

Capacitors kit: he can make a kit for you.

Aug 13, 2010 | Polaroid FLM-3734B 37 in. LCD HDTV

1 Answer

Humming noise when volume over 40

This hum could be from a ground loop or a bad main board in your TV.
1. Try removing all the inputs from the back of the TV.
2. Unplug the TV for about 3 minutes and plug it back in.
3. Turn on the TV and go to HDMI1 input.
4. Turn the volume up to see if you hear the hum.
5. If you hear the hum without any inputs into the TV, then the problem is with your main board, or with the quality of power you have going to your TV (your wall outlet may have an open or bad ground). You can try plugging the TV into a different outlet across the other side of the house (to try a different circuit) to see if your power is the problem.
6. If you don’t hear a hum without any inputs into the TV, then the audio hum is caused from one or more of your inputs.
7. You will have to plug in one input at a time into the TV, and turn up the volume to see if that one input is creating the hum. If the TV hums, then you have a problem with that device and or the cable that connects it to the TV.
8. There is a chance the hum will occur when two or more devices are connected to the TV at the same time. So be careful of this issue. This issue is not the fault of the TV and is a grounding issue between the devices.
I hope this information has helped you.
Good Luck.

May 28, 2010 | LG 32LG30 32 in. LCD HDTV

1 Answer

Humming or squealing noise when tv is turned on (model 32LG30)

Be sure you have installed the stand scresw weather or not you are using the stand.
The back panel can vibrate without the screws.

Other sources of a hum are the coils on the power supply.
The power supply would have to be replaced to solve the issue.

Jan 19, 2010 | LG 32LG30 32 in. LCD HDTV

1 Answer

The humming noise from my hitachi 42hds69 television seems to have gotten a little louder. This humming sound is more prevelant on various stations. The humming sound seems to be normal/better on dark...

usually it means your screen is going bad unless it is a fan or some mechanical part thats humming if it comes from the screen itself the screen panel going you can check cables and eveything else for this a signal loss type of short but if you have allready checked all cables or recievers or connected devices for this then its a simple main panel humm means a bad screen panel sorry to say but i hope this helps..

Jun 24, 2009 | Hitachi 42HDS69 42 in. Plasma Television

1 Answer

Audio humm on VIZIO VW32LHDT30A

You have a bad ground through the cable box or cable system. This causes AC to leak into the TV showing up as bars that roll from bottom to top and sometimes audible as well. Have the cable company replace the cable box and/or check out for proper grounding outside at the demarcation point.

Mar 23, 2009 | Vizio VW32L 32 in. LCD HDTV

1 Answer

Poor sound quality

Hi, I sent an email regarding the issue to OnCorpus (the company who makes ProScan)

This is what I got back:

Follow these steps to correct humming issue:
1. Turn tv on
2. Input mode should be tv
3. Turn volume to zero
4. With remote enter 9 8 7 6
5. A menu will appear on left side
6. Arrow down to backlight and with right arrow key move number from 81 to 83, press menu button twice,
7. Turn up volume and listen if hum is gone.


I can't confirm if this works at this moment since I don't have access to my TV.


Feb 11, 2009 | Proscan 26LB30QD 26 in. LCD HDTV

2 Answers



More often than not, the humming sound on any electronic device is brought about by the AC side of the power supply not only of the device itself but also all other equipment it is attached to. In your particular case, it maybe introduced into the system from:
  • (coaxial) cable TV leadin;
  • connections of DVD, VCR, game consoles and others;
  • electrical noise from lamp dimmers, lights with electronic ballasts, wireless phones.
It is interesting to note, that the noise could be from other appliances plug in the same circuit as the TV, you of course could try plugging it into another outlet or branch. In some instances, you could even try filtered regulators similar to those used by desktop computers.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Nov 13, 2008 | Proscan 32LA30Q Television

2 Answers

Humming noise from my surround sound Bravia 1080 HD TV

I had a similar problem with my Sony Bravia 40S2000.....

Access the 'tools' menu via the remote......change the power setting to 'low'....and presto!....the humming noise stops!

Mar 29, 2008 | Flat Panel Televisions

1 Answer

Humm coming from speakers - can't get cable to work

The RF input is the correct one for a cable signal. The other sources use the RCA and other ports which you can connect to other devices, like DVD or VCR players.

If the humm noise only happens when you're on the TV channel then it's likely just the station. Try changing the channel and see if that helps, and make sure the coax is screwed in all the way. Also make sure the other end, if connected to a VCR or other stuff, is tightly attached. If you share cable with many other people and the signal has snow (white spots on the TV), then you may need to buy an RF signal amplifier to reduce the noise.

Source changes the input (RCA versus coaxial versus component inputs), change the channel for different channels..

Jan 31, 2008 | Akai LCT2701AD Television

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