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Thread: screen whine?

  1. #1
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    screen whine?

    I recently purchased an a500 and I noticed for the first time today that it has a faint high pitched whine coming from the back of the unit, most noticeably from the speaker cutouts. It gets louder when plugged into the charger, but is still extremely faint. The noise is not present when using headphones, and adjusting the brightness or turning off the auto brightness makes no difference. I searched (yes, i searched first, lol) and found some info about screen whine, but nothing specific to the a500. I originally thought maybe the speakers were picking up something, maybe from a bad ground, but the noise is extremely consistent. it never changes pitch and only gets slightly louder when plugged in. My first instict was to exchange it, but I have already done that three times to get one with no dead pixels. The noise is extremely faint, and were it not for my OCD, I probably never would have noticed until I would have tried to watch a movie in a quiet oom while charging. Any thoughts would be appreciated.

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    Where are you getting these units with dead pixels?
    Are these refurbished or or something.

    I've not heard any whine from mine, but then with my ears i wouldn't hear any high pitched noise anyway.

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    I purchased it at Best Buy. The first one had dead pixels so I exchanged it, then had to exchange that one for same reason. When the third one had dead pixels as well, I thought maybe there was a bad batch so I exchanged it at another Best Buy about fifteen miles from here. This unit has, and still is working flawlessly, other than the whine. It is almost impercptible. It does get louder when the charger is plugged in though. You have to hold the tablet speaker to your ear to hear it unless charger is plugged in. I only noticed it because I was in a very quiet room with the charger plugged in. I tried to search to find if this was normal, and some other forums stated that in similiar cases it was the hardware controlling the screen and that meant it was soon to fail. In all of the other cases it was not an Acer tablet, so i figured i would ask here to see if it was normal. If it is not, I would like to be able to exchange it for a new one at the store while I can. I have tried a factory reset hoping it was a bad driver install or something , but it is still there.

    P.S. No these are not refurbished units.

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    Does the whining disappear when your tablet is sleeping? Is it influenced by the volume control?

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    no, the volume control does not affect it, nor does the brightness control. yes, it disappears when sleeping. it is constant and only gets slightly louder when charge cable is connected. pitch, volume, etc. are always the same. i have done a factory reset and there is no change. with normal usage, i doubt the average user would ever notice it. it is so slight that it doesnt bother me even with my ocd. i just dont want this to be a sign of impending failure. i have seen three pr four posts of people with the same issue. all but one were using custom roms though and they stated that reflashing or changing rom fixed it. mine is completely stock and not rooted.
    Last edited by BeNT; 12-18-2011 at 10:13 PM.

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    And i have exactly the same noise.What is this noise?

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    any thoughts anyone? if this is something that is common and its just that no one really noticed before, and they have not experienced any other issues then i can live with it.

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    My a500 doens't whine or at least I can't hear it.

    But if I were YOU then I would take it back and have them unbox the new one and listen to it before I brought it home and of course check for dead pixels.

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    Quote Originally Posted by BeNT View Post
    no, the volume control does not affect it, nor does the brightness control. yes, it disappears when sleeping. it is constant and only gets slightly louder when charge cable is connected. pitch, volume, etc. are always the same. i have done a factory reset and there is no change. with normal usage, i doubt the average user would ever notice it. it is so slight that it doesnt bother me even with my ocd. i just dont want this to be a sign of impending failure. i have seen three pr four posts of people with the same issue. all but one were using custom roms though and they stated that reflashing or changing rom fixed it. mine is completely stock and not rooted.
    As you've probably guessed by now, this is NOT common, and probably NOT harmful, and NOT indicative of immanent failure.

    If brightness does not affect it, and volume does not affect it, it is most likely the noise is being induced into the speaker wire somewhere past the sound chip (on the way to the speakers).

    See the routing of the speaker wire in this photo . The routing of the Speaker wire is probably just a little bit different in yours than others. If you look carefully at that picture you will see the speaker wire (round) running parallel to the screen ribbon cable. A slight mis-positioning of that cable (like out from under one of the clips that hold it in place) is all it would take.

    I don't think this is a big deal unless its loud enough that it bothers you, in which case I'd take it back.

  11. #10
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    i agree with you on all counts except, i dont think it is induced noise. i think it only appears to be coming from speakers because that is the only opening in the back. i think something else is oscillating. another interesting point is that the buzz stays the same volume when you initally plug charge cord in, but any movement of thr plug causes it to get louder, like a bad ground in the chstging circuit. seeing as best buy is out of stock and with the christmas extended return policy, i have until january 24th, so i think i will wait and see whst happens between now and then. if it stays as it is, i will keep it (unless my ocd kicks in lol)


 
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