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

    Hi,

    Appreciate much the sharing of info. TNX

    DU1CCC

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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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Picture fine no flashing lights. Audio has constant hum. Volume needs to be at 100 in order to hear after and hour or more sound returns and hum goes away.


Unplug the set, remove the back, and inspect the power supply board (usually the power cord goes straight to the power supply). If you see any electrolytic capacitors with the tops bulged out, this could cause the problem - the power supply voltage to the audio circuit would be low and poorly filtered, and often varies with temperature or load. There are additional capacitors right at the audio amp that could cause the same problem when they go bad, but usually it's the ones right in the power supply. Do a web search for "bad capacitor" images to see exactly what to look for.

Fortunately, the parts are cheap (usually under $1 from electronic component suppliers) and not very difficult for a competent electronic technician to replace. Insist on replacements rated for at least 5000 hours endurance at maximum temperature, and selected for the highest available ripple current rating. The Panasonic FR series capacitors are a good choice. They'll cost a few pennies more than the Chinese off-brands with no endurance or ripple current specs available to the public, but it's well worth it.

Jun 25, 2015 | Flat Panel Televisions

2 Answers

High pitched hum from LNT5265FX when powered off


i'm surprized the set still turns on you have what sound like either a bad Capacitor or shorted Zenor diode in the power supply You really need to have a tech take a look it does sound like you will need a power board replacement

Dec 18, 2009 | Samsung LNT5265FX 52 in. LCD Television

1 Answer

60 Hertz hum in audio. When I turn the TV volume down to where the hum isn't bad, the volume level from my cable box isn't high enough for me to hear.


Try moving any power cords away from the coaxil cables and dont have the cable box resting on any other electrical equiptment

Sep 21, 2009 | Flat Panel Televisions

1 Answer

When my polaroid flat screen tv is turned on humming


Check to see that you're not in SAP mode, (Separate Audio Program) in the audio portion of your menu. Could also be filtering via a bad cap or two in the audio circuit the the hum is a 60 cycle hum because of it. If you have a cap analyzer you could check those also.
Hope this helps!
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

Aug 22, 2009 | Polaroid TLX-01911C LCD TV

1 Answer

My smamsung lcd tv has thick horizontal lines across screen that move upward, any ideas?


You have what we call 60 Cycle Hum Bar. You also might have audio hum too. The problem is a grounding issue either coming from the source such as a Cable Box or a Sat box. More often this occurs with cable boxes. First unplug the source box from the tv completely. You will find that the Lines have disappeared. Next connect a Coax cable coming from the wall bypassing the Box to the RF input on the tv. If you still have the Lines, then the problem is with the Cable signal not being correctly grounded and you need to call the Cable co.. The Cable box can also be causing this as well. If all of this does not work then try using another set of Component cables as they can cause the same issue.

Jul 09, 2009 | Flat Panel Televisions

2 Answers

Hum in sound volume


It could be a few things. The first thing you want to look at is make sure that the microphone is muted in the mixer controls of your audio cards. These settings are located in the control panel. If you need the mic, look under the advanced settings under it and disable the 20 db option for it.

If that doesn't work I have a few other ideas.

Mar 17, 2009 | Proscan 32LB30QD 32 in. LCD TV

1 Answer

There is a loud hum on my 32" AKAI LCD TV on all channels.


The humming noise is cause by defective capacitors in the power supply 12 volts line. These capacitors become defective due to the amount of heat surrounding them.
I repair these power supplies. If you need further assistance, write to jah2mil@hotmail.com

Feb 01, 2009 | Akai LCT2715 27 in. LCD Television

2 Answers

Hum in the audio - 32'' Proscan 1080i


does the hum occur when playing a dvd or only when watching tv ? if the hum occurs only when watching tv, i would like you to disconnect the cable line from either the wall or the back of the cable box and see if this hum disappears. if the hum disappears call your cable company. you have what is called a " 60 cycle ground loop ". hope this helps.

Jan 20, 2009 | Flat Panel Televisions

1 Answer

Loud humming noise from new hdtv


hello, the speakers are fualty or have a shorted connection if they came with the tv contac your seller and arrange for a replacement imediately dont wait. since they are giving you feedback dont use them they may cuase other fualts in your tv, any component thats cuases hum or noise when pluged into the tv should not be used at all.

one important thing is to have a grounded plug this also may cuase fualts down the line,
if posible get a power line conditioner or ups (uniteruptable power supply)

flat panels are very over protective you dont want the tv to start blinking. since flat panels have built in protection circuts any slight short or fualt may cuase the wide screen to go into circut shutdown mode and this will cost you more if the speakers create a short in your audio circut it may damage your widescreen internal boards and cuase a system shutdown circut (red light flashing no picture)

contac your sellers site let them know your speaker are cuasing a loud hum
and that you will need the speakers replaced these are definitely fualty
if you dont have any coverage or you got the set as is then dont take any chances use other speakers.
if you are electronically inclined you can open these up and find out whats wrong with them internaly it may be a loose connection, since opening up the equipment may void your warantee contac the store first see what they say..
good luck happy holidays

Dec 10, 2008 | Hannspree Flat Panel Televisions

1 Answer

Hum in sound


the tv is picking up a 60 cycle hum from the bond wire.they did not filter the main audio board.to fix it buy a 3 wire to 2 wire ac plug without the bond wire. plug it into the wall socket an it should fix the hum. it fixed mine an now no hum. fletchb321.

Jul 24, 2008 | Polaroid FLM-3734B 37 in. LCD HDTV

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