LCD/Plasma Dilemma - AVS Forum
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post #1 of 20 Old 11-15-2005, 10:43 AM - Thread Starter
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So now I somewhat understand that all plasma/LCDs emit a slight noise, even when in standby, due to the backlights and/or inverters.

Is it worth it to stick to flat panel despite this? I'd have to end up physically switching off the set every night if I want to sleep... :rolleyes:
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post #2 of 20 Old 11-15-2005, 10:46 AM
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Yes you should shut off your LCD or Plasma before you go to bed, or be sure a timer will shut it off. I don't here anything from my plasma personally.
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post #3 of 20 Old 11-15-2005, 10:50 AM
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Yes, ALL plasmas and LCD flat panels emmit a very annoying loud buzzing noise.

But the picture is so good the sound won't bother you. The sound really isn;t that bad. It's kind of like an airplane flying over your house constantly..after a while you just et used to it.

I just unplug my plasma every night before going to bed. But the hum still stays, just not as loud. I think their must still be power left in the electronics so you still hear the hum.

Don't worry about it though. Just turn on a fan or something to mask the noise when you sleep.

: )
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post #4 of 20 Old 11-15-2005, 10:52 AM
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I have never heard a peep out of my 37" Sharp, 26" Sharp or 15" Sharp.

I know that you believe you understand what you think I said, but I am not sure you realize that what you heard is not what I meant.
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post #5 of 20 Old 11-15-2005, 11:16 AM
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I have a Sharp 26" LCD, a Panasonic 22" & 20" LCD and a 42" Hitachi PDP. I have never heard any kind of noise (buzzing or otherwise) coming from any of them. Even with my ear right up to them in a quiet room. And yes, my hearing is very good.
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post #6 of 20 Old 11-15-2005, 11:22 AM
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Quote:
Originally Posted by TheSkeptiks
Yes, ALL plasmas and LCD flat panels emmit a very annoying loud buzzing noise.: )
I wouldn't say "ALL" do, but "MANY" do. We can't hear anything from our 42" Panny plasma unless we put our ear right near the display and many other forum members report little or no audible buzzing or fan noise from their displays.

-Steve
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post #7 of 20 Old 11-15-2005, 12:16 PM
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I don't hear an electronic hum from a Panasonic plasma nor a Sharp LCD. I used to hear a hum from a Sony CRT which we got rid of several years ago.
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post #8 of 20 Old 11-15-2005, 01:22 PM
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Buzzing is likely a bad capacitor, get it fixed before it blows out and does more damage. I had CRT tv that would still be working if I hadn't been to lazy to get a cap fixed. If it's buzzing while the TV is off, it's the power supply, and not the fan or the lighting. But even if the fan and or lighting is buzzing, it probably means something is wrong.
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post #9 of 20 Old 11-15-2005, 01:35 PM
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FWIW, power supplies can buzz/resonate if the power coming into the house is dirty, and in particular has a DC offset. a lot of things hum/buzz in our house and didn't in a prior apartment. i went through a couple of Sharp's and decided to just live with it. granted, the hum/buzz is only audible if my ear is within 6 inches of the TV, if not, it is silent.
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post #10 of 20 Old 11-15-2005, 01:46 PM
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CableCard may also account for some of the differences. The Panasonic 42PX50U for example consumes 22 watts in the standby mode with the CableCard inserted, but only 0.6 watts when it is removed. Greater energy consumption is not always synonymous with noise, but it's much more likely.
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post #11 of 20 Old 11-15-2005, 02:00 PM
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My PX50U is totally quiet.

No buzzing at all.
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post #12 of 20 Old 11-15-2005, 03:23 PM
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Sorry...I was joking in my original post...I guess it came off serious.

NO loud sounds or loud buzzing coming from my Pioneer plasma.

If you put your ear right up to the display you can hear a VERY VERY slight buzz/hum, but step back 1 foot from the display and nothing at all.
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post #13 of 20 Old 11-15-2005, 04:41 PM
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Quote:
Originally Posted by TheSkeptiks
Yes, ALL plasmas and LCD flat panels emmit a very annoying loud buzzing noise.

But the picture is so good the sound won't bother you. The sound really isn;t that bad. It's kind of like an airplane flying over your house constantly..after a while you just et used to it.

I just unplug my plasma every night before going to bed. But the hum still stays, just not as loud. I think their must still be power left in the electronics so you still hear the hum.

Don't worry about it though. Just turn on a fan or something to mask the noise when you sleep.

: )

This is simply not the case with my HP (which is going back due to rainbows). The HP 42PL00N that I just recieved from TVA is dead quiet. Can't hear a thing. No fan noise, no buzzing, no nothing.
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post #14 of 20 Old 11-15-2005, 04:43 PM
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Quote:
Originally Posted by TheSkeptiks
Sorry...I was joking in my original post...I guess it came off serious.

NO loud sounds or loud buzzing coming from my Pioneer plasma.

If you put your ear right up to the display you can hear a VERY VERY slight buzz/hum, but step back 1 foot from the display and nothing at all.
I saw the humor, and actually was chuckling when I read it...

;)
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post #15 of 20 Old 11-15-2005, 05:33 PM
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Quote:
Originally Posted by TheSkeptiks
Sorry...I was joking in my original post...I guess it came off serious.

NO loud sounds or loud buzzing coming from my Pioneer plasma.

If you put your ear right up to the display you can hear a VERY VERY slight buzz/hum, but step back 1 foot from the display and nothing at all.
Sorry, I missed the little smiley at the end of your first post.

-Steve
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post #16 of 20 Old 11-15-2005, 07:29 PM
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Quote:
Originally Posted by slb
Sorry, I missed the little smiley at the end of your first post.

-Steve
Speaking of smilies....how do you put it at the end of the post? Mine is put up top for some reason.
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post #17 of 20 Old 11-15-2005, 09:55 PM - Thread Starter
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no sounds at all? then why do some service reps insist the sounds are "normal"?

this is second set i'm on due to this buzzing.

are new homes susceptible to "dirty power" ?
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post #18 of 20 Old 11-15-2005, 10:34 PM
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My 50" plasma is VERY quiet, My Dish DVR receiver is much louder.
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post #19 of 20 Old 11-16-2005, 09:02 AM
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Quote:
Originally Posted by A176
no sounds at all? then why do some service reps insist the sounds are "normal"?

this is second set i'm on due to this buzzing.

are new homes susceptible to "dirty power" ?
good question. our house is only 4.5 years old and yes it has dirty power. i noticed it from day one...things (clock radios, etc) that didn't buzz/hum in my old apartment now hum. if you have other things in your house that hum (clock radios, other electronics), then likely, the source of your buzzing is dirty power. if this particular tv is the only thing in the house that buzzes/hums, then it's the tv itself.

of course, it should be noted that sometimes people confuse ground loop hum for transformer buzz. i'm talking about the latter. the sound is coming from the power supply, not being trasmitted through speakers.
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post #20 of 20 Old 01-12-2006, 10:05 AM
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Are there any fixes for "dirty power"?
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